94 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 37. 



Fig. 18. — Holotel- 

 son tuberculatus. 

 Abdomen op male. 

 X 3i. 



The seventh segment is a little longer in the middle portion than any 

 of the five preceding segments and is produced backward in two short 

 rounded processes, one on either side of the median 

 line, which extend over the first abdominal segment, 

 covering its anterior portion. 



The first segment of the abdomen is longer in 

 the middle portion than at the sides, and is pro- 

 duced in the median line in a triangular process 

 which ends in a small tubercle. There are two 

 suture lines on either side, indicating partly coa- 

 lesced segments. The terminal segment has a 

 transverse row of three tubercles about the middle of the segment, 

 one in the median line and one on either side. Posteriorly it is pro- 

 duced in a long median process, about twice as long , 

 as wide and rounded at the extremity. At the base 

 of this process on either side is a small, rounded 

 tooth. The branches of the uropoda are about equal 

 in size and similar in shape; they are oar-like and 

 do not extend beyond the lateral teeth at the base of 

 the median process. 



The female differs from the male in the shorter 

 terminal abdominal process, in the less pronounced 

 teeth at the base of this process, in the shorter proc- 

 esses on the posterior margin of the seventh abdominal segment, 

 which are only slightly indicated, and in not having the first ab- 

 dominal segment triangularly produced in the 

 middle and terminating in a tubercle. 



Five specimens, two females and three males, 

 were collected by the U. S. Bureau of Fisheries 

 steamer Albatross at Mororan, Japan, on the 

 shore. 



The female of this species is similar to Sphce- 

 roma aspera Haswell a from Port Jackson, Aus- 

 tralia, but differs in having three tubercles in a 

 transverse line about the middle of the terminal 

 segment, in lacking the " prominent tubercle on 

 the posterior margin on either side of the middle 

 line " of the first segment of the abdomen, and 

 in not having the last abdominal segment " ornamented with two 

 slightly convergent irregular rows of minute tubercles." 

 Type-specimen.— Cat. No. 39506, U.S.N.M. 



Fig. 19. — II o l o - 



TELSON TUBERCU- 



l a t u s . Abdo- 

 men or female. 

 X 3i. 



Fig. 20. — Holotel- 

 son tuberculatus. 

 Second pleopod op 



MALE. X 15g. 



a Proc. Linn. Soc. New South Wales, vol. 5, 1881, p. 472, pi. 16, fig. 3. The 

 species described by Haswell is probably a Cymodoce, the specimen obtained 

 being the female. 



