PAOURID.E. 



PAL.KONISCCS. 





Cenatila IXogtim. 



, initially not <rf abell, howln DM arrsnitrmrnt and structure of tho an. 

 Inui*. nr*r***i (rrt i * c - A**""* these Ut, what may be called the rooithnbod 

 pair (the fcuth) an will diaplarwl; , larje claw, external rlew. (Milne- 



, OMoMU In >bell (TWrto A'ca), showing the ditpotluon of tlie Brat paira of 

 lr*t e* Ike aalmal haa reUred aa far aa It can, and the large claw acting ai a 

 klad oT oyaiialMi to proteet the aperture. 



f| Specie* whoae ocular peduncle* are very much compressed, ter- 

 minated above by a rather sharp border, and supporting n nearly 

 triangular cornea, which does not sensibly reach beyond the 

 prolongation of the peduncular joint received into the notch 

 of ila upper border. 



'. r*gma. Stomachal region nearly flat; labial border of the 

 branchial region* very projecting, and slightly curved. Ocular 

 peduncle* nearly twice aa long a* they are high ; their basilary scale 

 mrtln*!^ and pointed. Feet graoulous and slightly muricatcd ; the 

 great daw moderate, and furnished above with a row of small, oblique, 

 and parallel erect*. Tani abort and triangular. Upper and external 

 edge* of the two lat joint* of the third 1. ft foot elevated into on 

 obtuM uesl Length about 3 inches. It ia found in the Indian Ocean. 

 There are three other peci**. 



CtmetUmi (Edward*). Thi* small generic division U but little distant 

 tram the Ptguri properly to called, and ia not aa yet more than imper- 

 fectly known to him, for he had not examined the female of the only 

 peci**, but UM peculiarities offered by the organisation of the male 

 unreal him from referring the form to any genus already established. 

 The abdomen, instead of being rolled upon iUelf and terminating in 

 a aort of (bapeleaa tail. Is perfectly symmetrical ; the appendage* of 

 the penultimate abdominal ring have the same form as in the Paguri, 

 bat are similar on each aide, and there i* no other appendage adhering 

 to the abdomen between this segment and the thorax. 

 r<fp<u I* the only known specie*. 



This gents*. according to M. Milnc-Kdwardu, appear* to 



eeUMiah the psmg* between the Payuri (or rather the Onobites) 

 and the LMkodi*. [HoMounx.1 Their carapace, terminated anteriorly 

 by a horicontal and projecting roetrum, i divided into two portion, 

 M in the Onobile* ; the interior portion formed by the atomachal 

 region is narrow, bat the posterior portion is very Urge and oval, the 

 branchial region* being very much developed, and forming on each 

 aide a sort of semicircular buckler, which advance* above the base of 

 the feet The ocular peduncles are stout, rounded, and of moderate 

 length. The internal antennae have the aame conformation a* In the 



Cnncrllvi Typia, 



Cenobites, except that their basilary joint ia still more elongated. 

 The disposition of the external antenna; and of the external j; 

 is also entirely the same as in the taint-named Fngurians. The anterior 

 feet are stout, rounded, and of moderate length ; the two succeeding 

 pair are terminated by a stout cylindrical joint ; and the fourth pair, 

 which are shorter than the preceding, but not elevated above them, 

 are provided with a cheliform hand, the two fingers of which are long 

 and cylindrical ; the posterior feet, which ore very short and cylin 

 are elevated under the lateral parts of the carapace, and terminated by 

 a very obtuse rudimentary pmcer. The abdomen ia very large, and 

 covered above by a small horny band, followed by four great corneo- 

 calcareous plates, which occupy ita whole width, and over-ride each 

 other, as in the Macrurous Crustaceans. On each side of these great 

 segments are to be seen one or two horny pieces, which seem to be the 

 representation of the epimerian piece of the four corresponding abdo- 

 minal ring*, hi the female the first three of these segments, that is 

 to say, the second, third, and fourth rings, have on each side a great 

 false foot formed by a small basilary piece and two great narrow and 

 ciliated appendages ; those members are wanting on the right side, 

 and in the male no trace of them is perceptible. The whole of tin' 

 inferior surface of tho abdomen is membranous, except that, towards 

 it* posterior part, may be seen a small quadrilateral plate, which gives 

 attachment to a second projecting plate, and has on each aide an 

 abdominal rudimentary false foot, composed of a basilary piece and 

 two moveable tubercles, which recal the disposition of tlic iippeiKlMgcK 

 of the sixth abdominal ring of tho 1'aguri, but which is symmetrical 

 on both side* of the body. The terminal plate is rounded at tho end, 

 covers the anus, and represents the seventh abdominal ring. 



The respiratory apparatus in Birgui presents very remarkable pecu- 

 liarities of structure. The branchiae are 14 in number on each side of 

 the body, ami are fixed by a peduncle situated towards the middle of 

 their internal surface. The respiratory cavity is very large, and the 

 branchiae only fill the tenth part of it; its vault is carpeted below by 

 a delicate and epidermic membrane; but this soon disappears and 

 leave* naked the skin, which is continued with that membrane, and 

 covered by a multitude of vascular vegetations. [Bn. 



PAOURUS. 



J'AIOLE. [PntMCLA.] 



PAL.v: ' >M VS. Kaup, an extinct genus of Rodents from the 

 aheim Sand. 



rAI,.V.()MSCI"S, a remarkable genus of Hctcrocercal !'. 

 constituted by M. Agasnitf, and Minded, by him in the first family 

 1 1.< iiliatct\ of his great order of Oanoidcan Fithes. Its place in thi'- 

 family will appear from the following synopsis of the Lepidottei : 



A. Body elongated, fusiform, upper lobe of the tail vertebratcd, nnd 

 longer than the lower lulu-. 



nircvs; Oil*- 



It. Body flat, broad. 



1 . I'ppcr lobe of the tail vertcbrated. 



2. Tail regular (tho lobes nearly equal). 



Tttraganoltpu ; Hajttditu. 



