836 PROCEEDINGS OF THE NATIONAL MUSEUM. 



the presence of two tubercles on the first abdominal seg^nient, in the 

 presence of two tubercles and two longitudinal ridges uniting in a 

 single ridge on the terminal segment, and in the eciuality in length of 

 the two branches of the uropoda. 



27. SPHiEROMA OCTONCUM, new species. 



Body with all the thoracic segments, except the first, marked with 

 four conspicuous brown spots, two on either side of the median line, 

 and with two spots on the first abdominal segment, one on either side 

 of the median line. 



Head small. First pair of antenna^ reach almost to the posterior mar- 

 gin of the first thoracic segments. Second pair extend fully to the 

 posterior margin of the first segment. 



Thoracic segments subequal. Epimera broad and extending down- 

 ward, forming an angle with the segments. 



First abdominal segment with two low tubercles close together, situ- 

 ated one on either side of the median line; terminal segment triangu- 

 lar, with apex narrowly rounded and sides 

 slightly infolded, forming a small opening 

 when seen from below. Six low tubercles are 

 situated on this segment, two in longitudinal 

 series on either side of the median line — the 

 lower ones being a little farther apart than 

 the upper ones — and one on either side of the 

 ^"cui'ToT abdomTJ"''" se^es. The uropoda do not reach the extremity 

 of the abdomen by some little distance. The 

 outer branch is the shorter and is broadly rounded posteriorly. The 

 inner branch is more pointed at the extremity. 



Five individuals of this species were sent by Mr. Heath from Mon- 

 terey Bay, California. 



Type.—^o, 22574, U.S.N.M. 



28. SPHiEROMA OREGONENSIS Dana. 



Spharoma oregoncnsis Dana, Proc. Acad. Nat. Sci. Phila., VII, p. 177; U. .S. Exj)l. 



Exp. Crust., II, p. 778, p].i>ii, fig. 4. — Stimp.son, Journ.Bos. Soc. Nat. Hist., 



VI, 1857, p. 69. 

 Sphm-oma olivacea Lockin(5ton, Proc. Cal. Acad. Sci., VII, 1877, Pt. 1, p. 45. 



Habitat. — Pacific Grove to Alaska. 



14. TECTICEPS Richardson. 



ANALYTICAL KEY TO THE SPECIES OK TECTICKPS. 



a. Terminal segment of abdomen pointed. Outer branch of uropoda much longer 

 than inner branch. First pair of antenna' reach the jiosterior angle of the first 

 thoracic segment. Second pair reach the middle of the second thoracic seg- 

 ment. Sixth and seventh pair of legs show a marked disproportion in the 

 length of the propodus 29. Tecticeps alascensia Eichardson. 



