II* 



HOMOUD.K 



HOKOLin,. 



110 



1 



Mi* thu* divide* the tribe into throe genera : 



SuJxheliform and exposed; carapace 1 

 HuadhlateraL / 



.rapace triangu 



lar; rustrutu 

 dimentary. 



: . [' . 



ru- y Lomit. 



Btmtlt (Leach). Carapace longer than wide, nearly quadrilateral ; 

 DM stomachal region occupying the whole breadth of it anteriorly, 

 ad UM braachial region*, though not prolonged above the base of the 

 feet, very large ; lateral portioiu of carapace vertical. Front narrow, 

 and advueia*; o a* to furtn a amall rostrum ; on each aide of ita ban 

 a Urge cooie tooth directed forward*. OrbiU extremely incomplete, 

 rithin, where the articulation of the ocular peduncle* is naked ; 



they an acarwly lnnile-1 without, and are continued with a large 

 oblique and vary superfieial pit, against which the eyea are applied. 

 Ocular peduncle* cylindrical, and divided into two portion! one 

 internal, Blender, and elongated ; the other stout, short, and termi- 

 nated by the eye. Internal antenna: not lodged in pit* ; their baailary 

 joint nearly globular and advancing below the insertion of the ocular 

 peduncle* ; tt.e two succeeding joint* very long, the third, aa in the 

 Bnekyw*, supporting two very imall multiarticulate filaments. 

 External antenna inserted nearly on the lame line aa the internal ; at 

 their ba*e a large auditory tubercle, which in sometimes extremely 

 nmji (tim ; their fint joint cylindrical, rather stout, and moderately 

 loo*;; the aeouod ileniler and very long; the third very abort; the 

 terminal filanunt very long. Buccal frame quadrilateral. External 

 jaw-fret nearly pedifurm, their three last joint* being Urge, and nearly 

 a* long a* the two preceding, which are hardly flattened. Sternal 

 pi MI run much resembling that of the Dromiana, and not containing 

 UM grniial part*. Feet very long ; tirt pair terminated by a nearly 

 cylindrical hand, fifth pair raited upon the back and Bubcheliform. 

 Abdomen very wide in the male aa well a* the female, and composed 

 of seven dictiuct joint* ; in the female the first ring carries a pair of 

 Tory abort appendage* ; thorn of the four succeeding segment* are of 

 UM aame form a* in the Brachyura ; the penultimate ring has no 

 vertigv of any appendage. The vulva;, instead of occupying a place 

 in UM sternal pUHron, an in the Brachyura, are hollowed in the 

 baailary joint of the third pair of feet. The disposition of the 

 branchiae i* equally remarkable : there are 14 on each aide; the 

 fin* is hud aero** (en travera) under the base of the succeeding ones, 

 and fixed to the bue of the second jaw-foot ; but the other* are all 

 directed obliquely up, and are fixed to the circumference of the vault 

 of the aideai One i* inserted at the ring which carries the jaw-feet of 

 the second pair, two above the base of the external jaw-foot, three on 

 each of UM two succeeding ring*, and two to the penultimate ring. 



The pecie inhabit the aeai of Europe. 



//. pim/roM ha* it* body covered with yellow hair* ; length about 

 18 line*. It u found in the Mediterranean Sea. 



Bmm*l0 tfi,./,**. ., kft rxlenul J.w.foot. 



" | " Hiprfareimiu kiipidut of Aldrovandua, and i* 



ab an inhabitant of the Mediterranean See, 



.* (Letmllc). M. Milne-rMwards remark* that up to th 

 praam! time th* l.\ikodtt have been arranged among the OryrAyitcA. 

 on aocmint of the form of the rostrum ; but he assert* that it is not 

 their plaor, and that they evidently belong to the Anomura. They 



bear, he say*, the greatest analogy to the Apttnra, and especially to 

 llomola ; but they establish the passage between these crustacean* 

 and Hiryta. 



Carapace trianguUr or rather heart-shaped, it* upper surface dis- 

 tinctly limited by a thick and spiny border. Rostrum horizontal and 

 very long ; it* base cover* the insertion of the eyes, and the anterior 

 border of the carapace ia very short. No orbit* ; but a stout conic 

 tooth is seen at the place ordinarily occupied by the external angle 

 of those cavities. Ocular peduncle* very short Internal antennie 

 inserted far from the mesial line, below and within the eye* ; their 

 first joint nearly cylindrical; the two succeeding of moderate length, 

 and the terminal filaments of the same conformation aa in the 

 Brachyura. External antenna inserted more backwards and out- 

 wards than the preceding ; their baailary joint entirely mortised 

 between a prolongation of the lateral border of the buccal frame and 

 the anterior border of the carapace ; the second carries a conic tooth 

 externally, the last joint of the peduncle is long and slender, and 

 finally the multiarticulate stem is rather long. The buccal frame is 

 not distinct, except laterally, where its borders are straight. The 

 external jaw-feet are pediform, and their second joint, which is stout 

 and short, carries internally a strongly-toothed prolongation. The 

 thorax presenla a disposition different from that of the crustaceans 

 which precede this genus in the system, but which is general in the 

 succeeding family (Pteryyura) ; its last ring is not soldered to the 

 preceding, but free, and even moveable. The sternal plastron is linear 

 between the first pair of feet, but becomes very wide afterwards, and 

 presents complete transverse sutures between the last three segments ; 

 in the interior of the thorax there is no posterior sell* turcica nor 

 mesial apodeme, nor sternal canal. The feet of the first pair are 

 moderate and cylindrical ; the three succeeding pairs are very long 

 and equally cylindrical; finally, those of the fifth pair lire extremely 

 small, and bent back in the interior of the branchial cavities ; they 

 are cylindrical, and* terminated by a small claw with flattened and 

 extremely short fingers. The abdomen is large, triangular, an>. 

 back against the plastron ; its baailary part is completely 8oli.liii.--l 

 below, but in the terminal half it is only furnished with corneo- 

 calcareoua isolated plates, which appear to represent the six last rings. 

 In the female, oviferous filaments seem to exist only on one side of 

 the abdomen. 



As in the other Anomurous Crustaceans, the vulva; are not situated 

 on the sternal plastron, but occupy the basilary joint of the third pair 

 of feet. The branchiae are disposed as in the rest of the tribe. 



L. arctica. Length of carapace about 5 inches ; colour, reddish - 

 yellow. 



It inhabits the northern i 



Lilhadn arctica (female), 

 a, left external jiw.fuut ; 4, abdomen ; <, foot of the fifth pair. 



Lomit (Milne- I'M wards). M. Milne -Kd words remark* that the small 

 crustacean on which he Imi founded this new genus has been con- 

 founded up to the present time with the Porrrllamt, to which it in 

 fact bears a resemblance in it* general form, but from which it dillem 

 in many important particulars, such as the conformation of the tail, 

 the antenna;, Ac. He gives the following generic character : 



Carapace depressed, narrowed an' i posteriorly, 



it does not reach beyond the middle of the bas of the thir.l pair of 

 feet, and the rest of the dorsal surface of the body is occupied by the 

 bane of the abdomen. The front is truncated, and armed with a small 

 mesial tooth ; there are no orbital pits, and the ocular peduncles have 

 the form of two great triangular joints, which touch each other on 

 their internal edge, and carry the eye* at their external angle. The 

 internal antenna; are moderate ; their first three joint* are cylindrical, 

 and terminate by two small filaments. The external antenna; are 

 inserted on the outside of the eyes, and nearly on the same line; they 

 are large, aa I trnuin.-iU- 1 by a stout multiarticulatc stem furnished 



