ISOPODS OF NORTH AMERICA. 287 



segment \h Jibout equal in length to the last thoracic segment, and is 

 marked on either side by two suture lines indicative of coalesced seg- 

 ments. The terminal s(»gment is entire, and not produced, being 

 evenly rounded in outline. The anterior portion of the segment is 

 convex, with a longitudinal series of four small tubercles on either 

 side of the median line, the two series being close together. The pos-. 

 terior extremity of the segment is marked by a prominent transverse 

 elevation. 



The inner immovable branch of the uropoda is narrow, elongate, 

 and })ointed posteriorly; it extends to the extremity of the abdomen. 

 The outer mobile branch is ])r()vided on the lateral margin with five 

 strong teeth. Both l)ranch(\s are of e([ual length. 



The tirst three pairs of legs are slender, and are furnished with long 

 hairs. The other four ])airs are somewhat 

 stouter. /'^/v' vX^ / 



Ten specimens were collected at Sausa- \) // ^^\v/ 



lito, California, by Dr. Kitter and party. \l r "^^^ \j 



This species is perhaps more closely al- Vy ^ ? yy 



lied to Sphivrotua slcholilil Dollfus" from V\ c o /V 



fJapan than it is to any of the known spe- V\\ //] 



cies of the genus from the Pacific coast of V Y^N^Cl^I...^^^;^/] / 



North America. It difi'ers, however, from ^ ^ 



that species in having a prominent trans- ^^'«- aou.-spH.KROM a pentodon. 



, , . ., , . , . ,. Abdomen, x 8. 



verse elevation on the posterior portion of 



the terminal segment, while in S. sleholdil the posterior part of the 

 segment is distinctly concave; in having five teeth on the lateral mar- 

 gin of the outer uropod, while in S. sieholdll there are seven; in hav- 

 ing fifteen joints to the fiagellum of the second pair of antenna?, while 

 this organ in S. sieholdii has a fiagellum composed of onl}^ ten joints; 

 in having two longitudinal series of four small tubercles, one on either 

 side of the median line on the terminal abdominal segment, while in 

 xS'. .neboldil tho, granulations on the caudal segment form, in the middle, 

 two divergent lines; and in having the body covered with minute gran- 

 ulations, while in S. Hleholdil the granulations are strong and more 

 prominent. 



The type is in the Museum of the University of California. The 

 cotype is in the U. S. National Museum, Cat. No. 28768. 



49. Genus EXOSPHyEROMA Stebbing. 



Second, third, and fourth articles of the palp of the maxillipeds 

 produced into lobes. 



The outer branch of the urojxxla is not denticulate on the exterior 

 margin. 



Characters otherwise as in the genus Sphaeroma Latreille. 



"Notes from the Levden Museum, XI, 1889, jip. 93, 94, pi. v. 



