56 CRUSTACEA. 



represents them, are thrown on the side and do not form with the 

 last segment a flabelliform fin. 



The ocular pedicles are generally longer than those of the Ma- 

 croura belonging to the following sections. 



Here (the Hippides, Latr.), all the superior teguments are solid. 

 The two anterior feet sometimes terminate in a monodactyle hand, 

 or one without a finger, in the manner of a palette, and sometimes 

 in a pointy the six or four following ones end in a fin; the two last 

 are filiform, reflexed, and situated at the inferior origin of the tail. 

 The latter becomes suddenly narrowed immediately after the first 

 segment which is short and broadj the last is in the form of an 

 elongated triangle, and the lateral appendages of the penultimate in 

 that of curved fins. There are four pairs of sub-caudal appendages, 

 composed of a very slender and filiform stem. The antennae are very 

 pilose or strongly ciliatedj the lateral first incline to the interme- 

 diate, and are then arcuated or contorted outwards. 



Albunea, Fabr. 



The two anterior feet terminated by a very compressed triangu- 

 lar, monodactyle hand; the last joint of the following ones falciform. 

 The lateral antennae are short, and the intermediate ones are termi- 

 nated by a single long and setaceous filament. The ocular pedicles 

 occupy the middle of the front, and form, together, a sort of flat trian- 

 gular snout, with the external sides arcuated. The shell is almost 

 plane, and nearly square; the posterior angles are rounded, and their 

 anterior margin finely dentated. 



The only well known species, Cancer symnista^L..; Albimea 

 symnista, Fabr., Herbst., XXII, 2; Desmar., Consider., xxix, 

 3, inhabits the Indian Ocean(l). 

 If the Cancer carahus of Linnaeus belong to the same subgenus, a 

 species would be found in the Mediterranean. 



HippA, Fab. — Emerita, Gronov. 



The two anterior feet terminated by a strongly compressed, 

 nearly ovoid and adactyle hand; the lateral antennae much shorter 

 than the intermediate, and contorted; the latter terminated by two 

 short, obtuse filaments placed one on the other; the ocular pedicles 



(1) M. Desmarest hesitatingly places the genus Posydon of Fabricius, who 

 speaks of two species, near the Albunese; but according to the latter the anterior 

 antennae are bifid, a character which does not belong to the Albunes. Owing to 

 the imperfect manner in which he describes this genus, we are not able to recog- 

 nize it, or to appreciate its affinities. 



