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

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

 The latter becomes suddenly narrowed immediately after the first 

 segment which is short and broad; 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 ciliated; 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 fiat 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 syni7iista i 'L.; Albunea 

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

 3, inhabits the Indian Ocean(l). 

 If the Cancer carabus 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 Fosydon of Fabricius, who 

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

 antennse are bifid, a character which does not belong to the Albuneac. Owing to 

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

 nize it, or to appreciate its affinities. 



