I'llOKllD.K. IV.V.i 



Fam. 4. PHOECIDiE. 



(Jqjluilon roundod. Antennae situated on the inferior margin. 

 Third i)uii' of i)ereiopoda imperfectly developed. 



1. PHORCUS. 



Phorcus, Edwards, Ann. des He. Nat. xx. p. 301 ; Hint, des Crust, iii. 

 p. 79. 



Cephalon oblitjuelj' ovate, increasing in depth anteriorly. Eyes 

 occupj-ing the infra-anterior pox'tion of the cephalon. Superior 

 antcnnio not longer than the cephalon : inferior antenna) " nidi- 

 mentary, setiform, and composed of three joints*." Oral aj)pend- 

 agos rudimentary ? (inathopoda simple, very short. First two pairs 

 of pereiopoda longer than the gnathopoda, moderately robust ; third 

 pair long and slender, filifonn ; fourth pair long and very robust ; 

 fifth pair very short, rudimentary. Three posterior pairs of pleo- 

 poda biramous ; rami lanceolate. Telson obsolete ? 



Tliis gcjius appears to be distinguisliable from all the other families 

 by the filifonn and imperfectly-developed character of the third pair 

 of pereiopoda. 



1. Phorcus Rajmaudii. (Plate LIII. fig. 9.) 



Phorcus RiiMiaudii, Edwards, Ami. des Sc. Nat. xx. p. 892 ; Hist, des 

 Crust, iii. p. 79. 



Cephalon deep, and flattened anteiiorly. Superior antennee two- 

 thirds the length of the cephalon, thickly covered with long haii- 

 along the inferior margin, as well as upon the apex of the fiagel- 

 lura ; peduncle long and stout ; flagellum short, articulating upon 

 the upper siu'face, formed of two articidi, each supporting one 

 or two coarse hairs. Gnathopoda extremely short. First two 

 pairs of pereiopoda twice the length of the gnathopoda, tolerably 

 strong, but normal in their formation : third puii- long, half the 

 length of the animal, filamentary, having the bases but slightly 

 dilated, long-(]uadrate, ischium short, meros long and slender, 

 carpus of the same diameter but longer, propodos of the same 

 length and thickness as the carpus, dactylos longer than the 

 propodos and of the same diameter : fourth pair- nearly as long as 

 the third, being veiy strong and robust, having the bases long- 

 ovate; meros broad, distally produced both anteriorly and poste- 

 riorly ; caqms rather longer tlian tlic meros, but more slender ; 



* Edwanl.". Hist, des Crust, iii. p. 7'.l. I was not ah'c to di'dvt the inferior 

 aiilcniuc ill tlic only .sjaviim-u thai 1 liavo hail (lie opportunity of examining. 



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