204 



W'^LLETIN 54, TTISTITED STATES NATIONAL MUSEUM. 



Fig. 199.— Rocinela 

 propodia lis. 



TJROPOD. X 6j. 



The first three puirs of leg.s have the propodus tirmed witli a process, 

 the ed^e of which is denticulate with six teeth meetino- squarel}- and 

 without interval, fonniniian unl>roken line; the carpus 

 is armed with one inconspicuous spine; the nierus has 

 five short blunt spines alon^* the inner margin and the 

 ischium is furnished witii one long- spine at the outer 

 distal angle. The last four pairs of legs are armed with 

 numerous spines. 



Onl}' one specimen, a- male and the type (Cat. No. 

 2924S U.S.N. M.), was taken by the U. S. 

 Bureau of Fisheries steamer Alhatross, 

 at station -1205, Admiralty Inlet, vicinity 

 of Port Townsend. 



This species differs from ^. angustata/'- 

 Richardson, which it closely resembles, in the denticu- 

 late process arming- the propodus of the first three pairs 

 of legs, with six contiguous teeth meeting squarely along 

 the edge, while in R. ((ngustata the propodus is armed 

 with four long spines; in having the merus of these 

 legs armed with five blunt spines instead of four long pie .^oo.-kocinela 

 ones; in having the outer branch of the uropoda a little pkopodialls. max- 

 shorter and narrower than the inner branch instead of ^'^^'^^^^ ^ ^ i. 

 almost twice as wide; and in having the frontal process wider and the 

 distance l)etween the eyes in front greater than in R. a/igusiata. 



ROCINELA LATICAUDA Hansen. 



Rorint'la Inticauda Hansen, Bull. ]\Ius. Comp. Zool., Harvard College, XXXI, 

 1897, No. 5, pp. 108-109.— Richardson, Proc. U. B. Nat. Mas., XXI, 1899, 

 p. 828 (part); Ann. Mag. Nat. Hist. (7), IV, 1899, p. 169 (i)art). 



Localitle><. — Off Acapulco; near Tres Marias Islands; off Mazatlan. 



Body oblong-ovate, two and a half times longer than wide, 16 nuu.: 

 40 mm. 



Head wider than long, 4 mm. : 7 nun., triangular in shape, with a 

 median process in front which has a blunt or truncate extremity. 

 The eyes are large, oval, composite, and situated at the sides of the 

 head, and separated anteriorly by a distance equal to 2 mm. The first 

 pair of antenna^ have the first two articles short and subequal, the first 

 article being almost entirely concealed dorsally by the frontal process; 

 the third article is twice as long as the second. The fiagellum is com- 

 posed of six articles. The first antenna? extend to the middle of the 

 fifth article of the peduncle of the second pair of antenna\ The sec- 

 ond pair of antenna^ have the first two articles short and subequal; the 

 third and fourth are also subequal and each is about three times as long 



"Proc. U. S. Nat. Mus., XXVII, 1904, p. 33. 



