298 



BULLETIN 54, UNITED STATES NATIONAL MUSP.'UM. 



Color, light brown, with markings of 



The tirst segment of the thorax is a little longer than any of those 

 following. The epimera are not distinct from the segments, but can 

 be distinguished from the segment by a faint line on either side. They 

 are laterally produced into a rather acute process on either side. 



The abdomen is composed of two segments. The first segment has 

 three suture lines on either side indicating three partly coalesced seg- 

 ments. The terminal segment is round posteriorly. The inner immov- 

 able branch of the uropoda is as long as the terminal segment, and is 

 narrowly rounded at the extremity. The outer branch is two-thirds 

 the length of the inner branch and is rounded posteriorly. 



The legs are all ambulatory. 



EXOSPH^EROMA CRENULATUM Richardson.a 



fjphxroma rrenulatum RICHARDSON, Trans. Conn. Acad. Sciences, XI, 1902, pp. 

 292-293, pi. xxxix, fig. 40. 



Locality. Bermudas. 

 Surface of body smooth, 

 black. 



Head rounded in front with small median point, 

 on either side of which is a small excavation. Eyes 

 situated post-laterally. 



First pair of antennae with the first joint of the 

 peduncle long; second joint half as long as first; 

 third joint equal in length to first; flagellum of five 

 joints reaches the post-lateral margin of the head. 



Second pair of antennae extend to the middle of 

 the first thoracic segment. 



Thoracic segments subequal. Lateral 

 margins straight. Epimera not dis- 

 tinctly separated from segments. 



First abdominal segment long, a little 

 longer than any of the thoracic segments, with two suture 

 lines. Terminal segment very convex, surface smooth, 

 posterior margin widely rounded. Uropoda not extending 

 beyond tip of terminal segment. Inner branch somewhat 

 pointed at its extremity, margin smooth. Outer branch 

 widely rounded and crenulate on the posterior edge. 

 Legs similar, all ambulatory, with small curved dactyli. 

 A number of specimens were collected at the Bermudas 

 in 1876-77, by Dr. George Brown Goode. 

 Type in Peabody Museum, Yale University. Cat. No. 3250. 



a This species is intermediate between Sphirroma and Exonphseroma, The second, 

 third, and fourth articles of the palp of the maxillipeds are but little produced. 

 Stebbing mentions another species, Sphtcroma globicauda Dana, which is also inter- 

 mediate between Sphiivoiiui. and Exosphseroma, The Fauna and Geography of the 

 Maldive and Laccadive Archipelagoes, II, Pt. 3, 1905, p. 710. 



FIG. 317. EXOSPH*- 

 ROMA CRENULATVM. 



FIG. 318. Exo- 

 SPH.EROMA 

 CRENULATUM. 

 MAXILLIPED. 



X7T*. 



