204 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



FIG 



PROPODIALIS 

 UROPOD. x 6i. 



The first three pairs of legs have the propodus armed with a process, 

 the edge of which is denticulate with six teeth meeting squarely and 

 without interval, forming an unbroken line; the carpus 

 is armed with one inconspicuous spine; the merus has 

 five short blunt spines along the inner margin and the 

 ischium is furnished with one long spine at the outer 

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

 numerous spines. 



Only one specimen, a male and the type (Cat. No. 

 29248 U.S.N.M.), was taken by the U. S. 

 Bureau of Fisheries steamer Albatross, 

 at station 4205, Admiralty Inlet, vicinity 

 of Port Townsend. 



This species differs from R. angustata a 

 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. angustata the propodus is armed 

 with four long spines; in having the merus of these 

 legs armed with five blunt spines instead of four long FIQ 200 _ 

 ones; in having the outer branch of the uropoda a little PROPODIALIS. MAX- 

 shorter and narrower than the inner branch instead of 

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

 distance between the eyes in front greater than in R. angustata. 



ROCINELA LATICAUDA Hansen. 



Rocinela laiicauda HANSEN, Bull. Mus. Comp. Zool., Harvard College, XXXI, 

 1897, No. 5, pp. 108-109. RICHARDSON, Proc. U. S. Nat. Mus., XXI, 1899, 

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



Localities. Off Acapulco; near Tres Marias Islands; off Mazatlan. 



Body oblong-ovate, two and a half times longer than wide, Iti mm. : 

 40 mm. 



Head wider than long, 4 mm. : 7 mm., 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 antennae 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 flagellum is com- 

 posed of six articles. The first antennae extend to the middle of the 

 fifth article of the peduncle of the second pair of antennae. The sec- 

 ond pair of antennae 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. 



