conopniiD-E. 273 



propodos ovate, palm obliipio, waved, defined by two short spines ; 

 dactylos having the inner margin serrated, rosterior pair of pleo- 

 poda longer than the preceding. Telson tubular. 

 Length ^ths of an inch. 



Hah. Coast of Northumberland {Mr. Aider). 



Subfamily 2. COEOPHIIDES*. 



Ccphalon and pereion broader than deep. Inferior antenna? sub- 

 |R>diform, 1/jug.er and more powerful than the superior. Coxa) small. 

 Tosterior pair of j^leopoda simply subfoliaecous or styliform, not 

 armed with huok-hke spines, Telson squamiform, unai'med. 



8. CYRTOPHIUiyL 



Cyilophiimi, Dana, U. S. Ea-plor. Exped. p. 839. 



Speiice Bate, Si/iiopsis, tVc, Ann. Nat. Hist. Feb. 1857- 



Iflide, Hist. Brit. Cni.st. p. 195. 

 Platophiiuii, Dana, U. S. Explor. Exped. p. 838. 



" Pereion narrow-eUiptical. Pleon inflexed beneath tlie pereion. 

 Cephalon subquadrate. Eyes situated at the anterior angles, and 

 a little prominent. Antennte pediforra, with very sTiort flagclla 

 or none ; the inferior pair a little the longer. Gnathopoda sub- 

 chelate ; second pair much the stouter. Posterior pair of i)leopoda 

 minute, simple, partly concealed by the telson ; antepenultimate 

 and penultimate pairs with the rami unequal, not specially curved 

 upon tlie outer side." — Dana. 



I think that Dana's g-enera Cyrtopldum and Platopluum should be 

 united, since the only distinctions which exist between them are the 

 respective lengths of the rami of the pleopoda, the more lamellar form 

 of the inner ramus of tlie antcpenidtimate and penultimate pairs and 

 the greater length of their spines, — the fundamental characters of 

 each being the same. 



I have retained the name of Ci/rtophlum in jTrefercnce to that of 

 Phitojihium, since I had adoptc'd the former for a European species 

 pre\nously to determining that the two were synonymous. 



The above generic characters are taken from those given Ijy Dana 

 for the genus Platopldum, — a short note, pointing out the sUght dif- 

 ferences, being the only description given of Cijrtophium as a genus. 



* Section Tlbifica. — On account of the close resemblance of the females of 

 Cerapus {Lercofhoe) to the animals belonging to the genus Pudvccrus, together 

 with the cireuniBtunce that Hajyloopn, Liljeborg (a genus belonging to the sub- 

 family Ami'eliscaueh, which 1 received too late to arrange in its jjropcr place in 

 this Catalogue), dwells in tubes, I think thai the sections Nidifk.v (see p. li.'W) 

 and Ti'iiiFifA are unneecssarj- and should be cancelled, as being of too arbitrary 

 a character. In classification, it is better to rely upon the structure tlian ujjou 

 the iiubits of uniinulii. 



