No. 1633. 



SOME NEW ATLANTIC ISO POD A — RICHARDSON. 



83 



Fig. 17. — Heterome- 

 s u s granulatus. 

 Middle part of 

 body of male. 



The first segment of the abdomen is short; the terminal segment 

 is longer than wide and has the posterior margin produced in a 

 prominent rounded lobe. In the female the uro- 

 poda are shorter than in the male, and scarcely ex- 

 tend much beyond the median lobe of the abdomen. 

 In the male they are a little more than twice the 

 length of the median lobe of the abdomen. They 

 consist in both sexes of one long, pointed, spine- 

 like article. 



About fifty-seven specimens were collected by 

 the steamer Albatross in the following localities: 

 Forty-one females and four males at Station 2547, 

 south of Marthas Vineyard, taken at a depth of 

 390 fathoms; two males and one female at Station 

 2572, southeast of Georges Bank, taken at a depth of 1,769 fathoms; 

 one male at Station 2571, southeast of Georges Bank, taken at a depth 

 of 1,356 fathoms; one male and six females at Sta- 

 tion 2208, south of Block Island, taken at a depth of 

 1,178 fathoms, and one female at 

 Station 2078, off Georges Bank, 

 taken at a depth of 499 fathoms. 



The type from Marthas Vine- 

 yard is in the U. S. National Mu- 

 seum, Cat. No. 38969. 



This species is perhaps closer to 

 H eteromesus greeni (Tattersall) a than to any others 

 of the genus; it differs, however, from that species 

 in the character of the surface of the body which is 

 covered with low granulations, and not with "spine- 

 like tubercles ; " in having a rudimentary flagellum 

 to the first antennae; 5 in the shorter uropoda of 

 the female (Tattersall figures only the female) ; 

 in the fewer articles in the flagellum of the second 

 antennae which also has the three elongate first 

 articles; and in the peculiar markings on the body. 



Fig. 18. — Hetero- 

 mesds granula- 

 TUS. Abdomen of 



MALE. 



HETEROMESUS SPINESCENS, new species. 



Fig. 19. — Hetero- 

 m e s u s spines- 

 CENS. Male. 



This species is very close to the preceding, but dif- 

 fers in having a two- jointed flagellum to the first antennae; in the 



a Fisheries, Ireland, Sci. Invest, 1904, II [1905], pp. 20-22, pi. iv, figs. 1-6. 



6 In all fifty-seven specimens the flagellum is rudimentary. I examined each 

 one carefully, because at first I supposed the flagellum was broken, but a 

 minute article was finally discovered, which is almost imperceptible. 



