662 CLASS x. 



Phyllosoma LEACH. Body depressed, covered by two shields 

 the first oval, the second transverse, placed above the trunk. Eye* 

 set upon a long petiole. 



Comp. LEACH in TUCKET'S Expedit. to the Zaire, pp. 416, 417, and fig I 

 PI. XI., Journal de Physique, Tom. 86, 1818, pp. 306, 307, GUERIN Mrm 

 sur I' Organisation des Phyllosomes et Monographic de ce genre de Cm ft 

 Magasin de Zool. 1833, Cl. vn. PI. 6 13, C. GESENBAUR Ueber Phyllosonu 

 in SIEBOLD and KOELLIKEB Zeitsch. /. wissensch. Zool. v. 1853, p. 352 

 The latter author, from the consideration of the circulation, which in ib 

 more minute details agrees with that of the decapods, thinks that Phyllo 

 soma ought to be arranged with these. 



a) External antennce setaceous, longer than internal. Abdomen distincl 

 from trunk, divided into segments, with terminal pinna. 



Sp. Phyllosoma commune TUCKEY 1. L, with fig., DESMAB. Crust. PI. 44, 

 fig. 5. Phyllosoma clavicorne TUCKEY ibid, with fig., DESMAB. ibid. fig. 4. 



b) External antennce lamellose, increased by a lobe at the base, shorter than 

 internal. Abdomen very short or triangular, continuous with the shield 

 of trunk. 



Sp. Phyllosoma laticorne TUCKEY 1. 1., Cancer cassideus J. FOBSTEB, Natur- 

 forscher xvn. pp. 206 213, Tab. 5. 



Most of the species come from the Indian and African seas ; yet one 

 species from the Mediterranean is known. These animals gave occasion to 

 the name of the family which does not apply to the following genus. 



Amphion EDW. Shell elongate, oblong, continuous, covering 

 head and all the segments of trunk. Tail narrow, conical, com- 

 posed of seven segments, terminated by a flabelliform pinna. Ex- 

 ternal antennae long, furnished with an oval scale at the base, 

 filiform. 



Sp. Amphion Reynaudii MILNE EDWARDS, Ann. de la Soc. entomol. I. 1832, 

 pp. 336340, PI. 12 A, Hist. not. des Crust. PL 28, fig. 8. 



Family XXVI. Caridididea or Schizopoda. Shell covering 

 head and trunk, descending to the sides over the bases of feet, com- 

 pressed. Abdomen long, made up of seven segments, the seventh 

 with two lamellae of the last abdominal feet on each side composing 

 a flabelliform pinna. Feet of trunk slender, natatory. 



This family forms by its habitus the transition to the following, 

 from which, however, it differs by the absence of shear-shaped feet 

 and by the gills not being included within the shell. 



