CiAMMAUIl).i;. 123 



of ploopoda ha\-inf!; tlit'ir rami subcrnial. TcLson anmilatc. Colour 

 rc'cklish-j fUow, shading; into a brownisli-rcd. 

 lA>np:th ^ths of an inch. 



Hah. Isle of Cliausay (Ekhv.); trawlers off Plymouth (C. .S'. B.). 

 Ail the specimens tliat I have taki'U "wcrc from the carapace iind 

 branchial chambers of Mdia tSiiitinado. 



34. IPHIMEDIA. 



Ipliinicdia, liathkc, Bcifr. zttr Faun. Nuricci/cns, Nbi: Act. Leap. 184.':} ; 



(not Iphimedia, Daiai). 

 Mierocht'les, Kroyer, Tidskr. Nat. ser. '2. vol. ii. p. 5. 



C'ephiUon produced and anteriorly depressed. Pereion distended. 

 Pleon compressed. Ej^es two. Antenna? simple, su])e<iual. Oral 

 appendages projected anteriorly. Mandibles having an appendage. 

 Maxillipeds not ungniculate. First pair of giiathopoda feeble, having 

 the dactylos rudimentary, subapical ; second also feeble, subchclatc. 

 Coxa:> gradually increasing in depth to the .second pair of pereiopoda, 

 which, together Avith the preceding, arc produced interiorly to an 

 angle. Coxte of the thuxl pair of pereioiioda not half as deep as 

 the second. Pereiopoda having the dactylos strong and curved. 

 Posterior pair of pleopoda biramous, clean. Telsoa single, squa- 

 mifonn, emarginate. 



^fy description of this genus differs from Eathke's ; but in this 1 

 think I am justified, inasnuich as, Avhile he says the second pair of 

 gnathopoda are simple, his figures represent them subchehite ; and 

 the first, which he says arc chelate, have the dactylos so nidimcntary 

 that it re(iuires considerable magnifying power to detect it, and 

 though perhaps chelate, yet, from its immature character, only useful 

 as a diagnosis. 



Dana has evidently mistaken this genus for that of Atiihix of 

 Leach, to which itndoubtedly all liis six-cics ])eIong, except perhaps 

 /. no'Josa, in which the gnathopoda and nuixiUiped have not been 

 examined. 



1 . Iphimedia obesa. (Plate XXII. fig. 2.) B.M. 



Ipliinii'diii obesa, llatlilc, Ih-itr. zur Faun. Nonccqcns, Nin\ Act. Leo- 

 pold p. Si), pi. .'5. f. 1, 1843. 

 Microcheles anuata, Kriiyer, Nat. I'akkr. ser. "2. vol. ii. p. 5. 



Cephalon produced into a sharp pointed rostrum. I^ist segment of 

 the pereion and the first three segments of the jdeon having the 

 posterior margin of each produced into two latcro-dorsal teetli ; 

 thiid segment of the pleon having the posterior margin also fur- 

 nished witli two infero-posterior teeth. Eyes siibreni form, scarlet. 

 Superior antennfo onc-fourtli tbc biigtli of Ww animal : peduncle 



