29<S 



hitllp:ttn r)4, unitkd states national mttsp:[^m. 



The tir.st .segmont of the thorax i.s a little longer than an\' of those 

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

 be distinguished from the segment l\y 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 

 nai'rowly rounded at the extremity. The outer branch is two-thirds 

 the length of the inner branch and is i-ounded posteriorly. 



The legs are all ambulatory. 



EXOSPHiEROMA CRENULATUM Richardson." 



Sp}i,rr<»na crcnulatuin Richardson, Trans. Conn. Acad. Sciences, XI, 1902, pp. 

 292-293, pi. XXXIX, li^r. 40. 



Locality. — Bermudas. 

 Surface of body smooth, 

 black. 



Color, light })rown, with markings of 



Head rounded in front with small median point, 

 on either side of which is a small excayation. P^yes 

 situated post-laterally. 



First pair of antennae with the tirst joint of the 

 peduncle long; second joint half as long as first; 

 third joint eifual in length to first; Hagellum of fiye 

 joints reaches the post-lateral margin of the head. 



Second pair of antenna? extend to the middle of 

 the first thoracic segment. 



Thoracic segments subecpial. l^ateral 

 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 yery conyex, 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 am])ulatory, with small curyed dactyli. 

 A number of specimens were collected at the Bermudas 

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



Type in Peabody Museum, Yale Uniyersity. Cat. No 



Fig. 317.— Exosph.k 

 roma drenui.atum. 



Fig. 318.— Exo- 

 sph.eroma 

 crenulatum. 

 Maxilliped. 



3250. 



«This species is intermediate between Hphtvroma and Exosphcrroma. The second, 

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

 iStebbinfj; mentions another species, Sphnroind globicauda Dana, which is also inter- 

 mediate between SphiiroDia and Exoxpluvrovut, The Fauna and Geograi)hy of the 

 Maldiveand Laccadive Archipelagoes, II, I't. ?,, 1905, p. 710. 



