eu 



MAIIDJE. 



The disposition of the eyes is very diflorrnt, for they cannot 

 be reflected backwards, and there is no post-foraminal orbitary cavity ; 

 their peduncle shoots much beyond the edges of the orbit, and pre- 

 sents the same disposition as in the Oiocarcim, except that they are 

 immoveable. Form of the external jaw-feet the same as in Pita ; but 

 the epistome is extremely short. The feet are short, those of the 

 Mcond pair hardly longer than the post-frontal portion of the carapace ; 

 the succeeding feet are gradually shortened. The abdomen of the 

 female is composed of seven joints. 



The only certain locality of the species stated by M. Milne-Edwards 

 is the Red Sea. 



P. tubercMlota. There are some hairs on the feet, and even on the 

 carapace. Colour brownish. 



Its locality is unknown. 



Pericera (Latreille) Bearing much resemblance to Pita, but differ- 

 ing from that genus in many characters, and especially in the disposi- 

 tion of the orbits. Carapace very much elongated, and more or less 

 triangular, a little convex and unequal above. Rostrum horizontal, 

 and formed by two great conical horns. Front very wide, and 

 occupying nearly twice as much space as the base of the rostrum. 

 Orbits circular, very small, and extremely deep, directed outwards, 

 and entirely filled by the ocular peduncles, which are inclosed therein 

 as in a sheath, scarcely proceed beyond it, and cannot be reflected 

 forwards or backwards ; their upper border is very much produced, 

 and presents a fissure. The basilary joint of the external antennae is 

 very large, and presents nearly the same dispositions as in Micippa, 

 for it is much wider in front than it is behind, and terminates by a 

 very extensive transversal border, which is soldered to the front or 

 the sides of the rostrum. The position of the moveable stem of the 

 external antenna) varies a little ; sometimes it is inserted under the 

 rostrum, sometimes a little outside the lateral border of that pro- 

 longation, but always very near the antennary fosset, and very distant 

 from the orbit Disposition of the external jaw-feet, as well as that 

 of the sternal plastron, the feet, and the abdomen, nearly the same 

 as in Pita. 



The species are found in the seas of the Antilles, as far as is yet 

 known. 



1C. Milne-Edwards divides the genus into two sections. The first, 

 consisting of those species in which the anterior angles of the superior 

 orbitary border are prolonged into a strong spine, which much exceeds 

 the basilary joint of the external antenna: ; the second, of those 

 npecies which have the terminal tooth of the basilary joint of the 

 external antennte going much beyond the anterior angle of the superior 

 orbital border. 



P. cornula, M. Milne-Edwards (Cornejo cornuto, Parra; Cancer 

 cormudo, Herbst ; Mai* Taurw, Lam.), Homed Crab of Hughes, who 

 describes the whole animal as " covered with brownish plushy hairs." 

 Length from 3 to 4 inches. 



It is a native of the seas of Barbadoes and the Antilles. 



frriftra fomula (reduced one-fourth). 



_ I (Latreille) Approaching Pericera, the principal differ 

 Iwing in the disposition of the eye*. Carapace narrow, very 

 unequal, and furnished posteriorly with a large triangular prolonga- 

 tion, which covers the insertion of the abdomen ; rostrum formed ol 

 two styliform and divergent horns ; upper border of the orbit nrniwl 

 with a horn analogous to that of the rostrum, but directed more 

 obliquely. Ocular stems delicate, immoveable, and very projecting ; 

 internal antenna: presenting nothing remarkable; first joint of the 

 external antenna) much longer than it is wide, the second slender, 

 and inserted under the rostrum a little in front of the level of the 

 eyes, Epistome nearly square, and the third joint of the external 

 jaw-feet dilated towards the external and anterior angle. Feet slender 

 and cylindrical : in the female thoce of the first pair are hardly stouter 

 than the others, and are much smaller than those of the second pair. 

 Abdomen of the female composed of five joints only, the three rings 

 which precede the last being soldered together. Neither Herbst, 

 I jitreille, M. Uuerin, nor M. Milne-Edwards appears to hare examined 



MAIID.E. 61 



S. ctrvicornm, Latr. (Cancer cervicornu, Herbst), u the only specie 

 Down. Length from about two to three inches. 

 It is a native of Mauritius. 



Stenocinopt txrricornu. 



a, tinder side In detail ; t, termination of one of the first pair of feet ; r, ter- 

 mination of one of the succeeding feet. 



MtnvtJiiits (Milne-Enwards) With much of the habit of Pita, and 

 establishing the passage between that genus and Jfalimw. Carapace 

 about once and a naif as long as it is wide, very much narrowed ante- 

 riorly, and of the form of a triangle rounded at its base; rostrum 

 formed by a large pointed process, which is placed on the median lino 

 of the body, and occupies about a third of the total length of the 

 carapace ; the anterior angles of the orbits surmounted by a largo 

 pointed and horizontal tooth directed forwards ; the borders of these 

 cavities without fissures, and exactly surrounding the base of tho 

 ocular peduncle, which is short and but little moveable. The dispo- 

 sition of the external antenna), of the external jaw-feet, and of tho 

 thoracic feet, the same as in Pita, except that there exists on tho 

 lower surface of the tarsi two rows of horny points. The abdomen 

 of the male composed of seven distinct joints ; that of the female of 

 five only, of which the penultimate is formed by the soldering of 

 three rings. 



M. ifonoceroi. Length about 10 lines. Rostrum fringed with 

 hairs. Colour brownixh. 



It is found in the Red Sea and the Indian Ocean. 



Halimtu (Latreille). M. Milne-Edwards looks upon this genus as 

 establishing the passage between the Eurypods, the Pita, the Mcna:- 

 thii, and the next genus. 



Carapace, including the rostrum, about once and a half as long as 

 it is wide, and convex above ; rostrum advanced, and formed of two 

 divergent horns; superior orbitary border projecting, and the latero- 

 anterior borders of the carapace nearly always straight, and armed 

 with strong spines ; eyes not retractile, and exceeding considerably 

 the edges of the orbit, which is prolonged backwards, with a groove 

 which represent* the post-foraminary portion ; first joint of the exter- 

 nal antennic very long, straight, and nearly of the same width at iU 

 extremity as at its base, the insertion of the moveable stem of these 

 appendages not covered by the rostrum. The epistome very large, 

 and nearly square; third joint of the jaw-feet strongly dilated out- 

 wardly ; ptervgostomian regions very small; anterior feet slender, and 

 of moderate length in the male as well as in the female ; the succeed- 

 ing feet long, slender, and compressed, their penultimate joint enlarged 

 below, and truncated like a subohcliform claw. Abdomen of the 



