180 Miss H. Richardson on the Isopods of the 



27. Sphceroma octoncum, sp. n. 



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 t!ie first 

 abdominal segment, one on either side of the median line. 



Head small. First pair of antennse reach almost to the 

 posterior margin of the first thoracic segment. Second pair 

 extend fully to the posterior margin of the first segment. 



Thoracic segments subequal. Epimera broad and extend- 

 ing downward, forming an angle with the segments. 



First abdominal segment with two low tubercles close 

 together, situated one on either side of the median line ; 

 terminal segment triangular, with 

 apex narrowly rounded and sides Fig. 13, 



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 SphcBroma octoncu7n. xl3i 

 — and one on either side of the Abdomen, 



series. 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 Monterey Bay, California. 



T>/pe. No. 22574, U.S. N. M. 



28. Sphceroma oregonensi's, Dana. 



Spharoma oregonensis, Dana, Proc. Acad. Nat. Sci. Philad. vii. p. 177 ; 



U.S. Expl. Exp., Crust, ii. p. 778, pi. lii. tig. 4 ; Stimpson, Journ. 



Bost. Soc. Nat. Hist. vi. 1857, p. 09. 

 Sphcsioma oltvacea, Lockington, Proc. Cal. Acad. Sci. vii. 1877, pt. i. 



p. 45. 



Hab. Pacific Grove to Alaska. 



14. Tecticeps, Richardson. 

 Analytical Key to the Species o/" Tecticeps. 



a. Terminal segment of abdomen pointed. 

 Outer branch of uropoda much longer 

 than inner branch. First pair of 

 antennae reach the posterior angle of 

 the first thoracic segment. Second 



