1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 499 



Diaf/nosis. — Stoinatop()(lii,with tlie sixth abdomiual seijiiient not fused 

 with the telsou; the hind body sjnooth, very convex, and narrow; the 

 dactyhis of tiie raptorial chiw not dilated at the base and possessing 

 not more tlian three lateral teeth, or in some cases none; the subnie- 

 dian spines of the telsou long and having movable tips; not more than 

 four intermediate denticles, usually one. 



Remarks. — This genus is, as a whole, compact and well detined, but 

 the three species that I have i)laced under B in the key are of donbtfnl 

 attinities. F. moiiodactijid. Mihie Kdwards, may prove to be an imma- 

 ture form; P. sti/Ji/era, JMihie-Edwards, ai)pr<»aclies Gonodactylus very 

 closely; and (io)iodacljjlHs e)isi{jc>\ Owen, seems to be closely related to 

 the last. 



ANALYTICAL KICY TO TIIE SPECIKS OI" I'SHUIX )SQUILLA. 



A. PiiVH(h)ii(puUa. proiier. Hind body narrow and thick; ra])(orial claw armed with 



a few marginal spines. 

 ■ a. Basal prolongation of tlie uropod ending in 2 spines; da:dylus with ;5 teeth. 



* Telson wi tli crest and 4 other carina- f empusa. De Haaii. 



* * Telson with.a crest and other carina-. 



Eyes small and cylindrical cimata, Miers. 



Eyes flattened, clnb-shaped, 2 eye-sjtots on carapace oknata, Miers. 



* * * Telson with crest and 8 other carina-. 



Eyes flattened, cliil)-shaped; rostrnni with small median spine. 



oculata, Brnllc. 

 Eyes very large and triangular ; rostrum witlumt a spine. 



mecalopiithalm.v, Higelow. 

 &. Basal prolongation of the nropod ending in one- long terminal spine having 

 2 other spines on its inner margin. Telson with crest and 10 other 

 carina-. 



* Dactylns with 3 teeth. 



Kostrnin with a long median and 2 sliort lateral spines. 



LEssoxii, Gueriu. 

 Rostrum witli prominent median spiiu^ hut lU) lateral ones. 



CKIUSII, Koux. 



* * Dactylns with 4 teeth; telson wider than long pilaex.sis, de Man. 



B. Doubtful pi»iitii)n. Dactylns with a- single terminal spine. 



Telson smooth except for crest ; many very minute submedian denticles; rostrum 



almost snbti'iangular, acute monodactvla, Milne-Edwards. 



Telson with crest and 2 otlu-r czarina-; rostrum longer than wide, narrowed 



at the end stymeeha, Milue-Edwards, 



Rostrum trispiuose, median spine obsolete. 



( f Gonodactylus) ensiuer, Owen. 



PSEUDOSQUILLA (TLIATA, Miers. 



f Squill a cU lata, FAUiucir.s, Ent. 8yst., ii, p. 512, 1793. 



Sijnilla stylifera, Lamakck, Hist. Auim. sans Vert., v, p. 189, 1818. — Latreille, 



Encycl. Mcth., x, p. 472, 1825. 

 Pseudosqiiilla siyli/era, Dana, U. S. Expl. Exp., xiii, Cr., i, p. 622, 1852.—? \'on 



Martens, Archiv. f. Natnrg., xxxviii, p. 146, 1872. 

 Pseudfinqidlla ciliata, Miers, Ann. and Mag. Nat. Hist, (5), v, p, 108, 1880. — 



Brooks, Voyage of the Challemjer, xvi, ii, p. 53, 



