280 AMTHirODA NOKMALIA. 



miiltiartioulatc. First pair of c7iathoi)orla snbchelatc ; second pair 

 not suhchcliform. Posterior pair of plcopoda very short, single- 

 branched. Tclson squaraiform, simple. 



I. Corophiiim longicome. (Plate XLYII. fig. 4.) B.M. 



Corophiimi longicome, "Zntreilh', Geii. Crust, et Lis. i. p. 59.''* 



^'^ Lfimarclx, Ili.sf. dcs Anim. senis VeH. V. p. 184." 



Leoch, Ediuh. Ennjcl vii. p. 403 ; Linn. Trans, xi. p. 362. 



Desmarest, Consid. siir h's Cnisf. p. 270. pi. 46. f. I. 



Jirrbmnn, Cat. des Crust, reniei/h's dans leDcpt.du Catvados, 1835. 



" Guerin, Icon. t. 27. f. 1." 



Edwards, Ann. dcs Sc. Kaf. xx. p. 385 ; Hist, des Crust, iii. p. 6&. 



Bruztlins, S/cand. Amph. Gamin, p. 15. 

 ** Gammavus longiconiis, Fabricius, Ent. Si/st. ii. p. 515." 



" Mocmer, Gen. Ins. tab. 33. f. 0." 

 « Astacus liuearis, Penn. Brit. Zoo!, edit. 1777, iv. p. 17. pi. 16. f. 31." 

 " Quiscus Tolutator, Fallas, Spic. Zool ix. p. 59. tab. 4. f. 9." 

 " Cancer grossipes, Linn. Si/st. Kai.'" 



Male. — Eyes small, round, not distant, advanced to the anterior 

 margin of the cephalon. Superior antennae reaching to half the 

 length of the penultimate joint of the peduncle of the inferior; 

 first joint of the peduncle serrated on the inner inferior margin. 

 Inferior antennoD longer than the entire animal ; penultimate joint 

 of the peduncle armed ^vith a strong anteriorly- directed tooth on 

 the inferior distal extremity; flagellum consisting of only two 

 articuli, the apical ai'ticulus being much shorter than the pre- 

 ceding. First pair of gnathopoda small, having the carpus and 

 propodos subequal, long ; propodos shghtly increasing towards the 

 distal extremity, palm somewhat convex, armed with several equi- 

 distant submarginal hairs, the inferior angle slightly in advance ; 

 dactylos arcuate, impiaiging on the palm in its entire length. 

 Second pair of gnathopoda having the meros arcuate beneath, and 

 produced along the entii-e inferior margin of the carpus, fringed 

 with two or three roAvs of long plumose bail's ; propodos having 

 the margins parallel, with a row of long plumose hairs ; dactylos 

 long, sharp, unguiculate. Two anterior paks of pereiopoda having 

 long straight dactyla ; third and fourth pairs scarcely longer than 

 the preceding, fifth pair nearly as long again. Posterior pair of 

 pleopoda scarcely extending bej-ond the telson, having the ramus 

 foliaceous, nearly as broad as long, furnished with a few haii-s. 

 Telson broad, triangular, apex obtuse. 



Length YTT^hs of an inch. 



Eah. Loughor Marsh, Glamorgan (C. S. 5.) ; Berwick (Dr. Jo/m- 



* I am indebted to Wliite and Edwards for the synonyms and references 

 Tvithin inverted commas. 



