54 Benedict Two New Isopods from Coast of California. 



FIG, 12. Idotea rostrata. 

 (X3.) 



The antennulse reach the distal margin of the third segment of the an 

 tennae ; their basal joints are broad. 



The thorax is convex and nearly smooth ; the 

 first, sixth, and seventh segments are about equal 

 in length ; the third, fourth, and fifth are broadest ; 

 the second is intermediate; the first segment, as in 

 carinata, is deeply excavated, the antero-lateral lobes 

 reaching to the eyes ; both lateral angles of the 

 other segments are about equally rounded. The 

 epimera show only on the three posterior segments ; 

 on the fifth it shows slightly on the middle of the 

 margin ; on the sixth it occupies the posterior two- 

 thirds and is quite broad posteriorly ; on the sev 

 enth its occupies one-half the margin and is tri 

 angular in form. 



The legs are moderately slender. With the ex 

 ception of the first pair, the basal articles of all have a small tubercular 

 protuberance. 



The abdomen tapers with the body and is evenly rounded behind ; it 

 consists of a single segment with a suture near the base as in Synidotea. 

 The operculum is not crossed by an oblique line. There is a broad shad 

 ing of purple along the dorsum. The margins of the articles of the an 

 tennae and the dactyls are rosy. 



This description is made from two females from San Pedro, California, 

 presented by Mr. S. J. Holmes. The larger specimen is 12 mm. in length. 

 The sides of both are arcuate as is usual in the females of Idotea. 



Idotea stenops sp. nov. 



A single large female Idotea is in the collection from Monterey, Cali 

 fornia, where it was taken by Mr. Henry Hemphill. 



In general appearance the species closely resem 

 bles /. ochotensis,but more careful examination shows 

 it to be specifically distinct. The outline of the 

 body is similar to that of the female of ockotensis. 

 The head is more deeply excavated on the anterior 

 margin than in that species. The posterior margin 

 is concave. 



The eyes are situated a little behind the middle 

 of the exposed lateral margin and are five times 

 longer than broad, placed transversely just anterior 

 to the eye, the surface and margin excavated. 



The antennae are similar to those of ochotensis, 

 but the flagelluni has 15 articles. 



The thorax is widest at the third and fourth seg 

 ments. The epimera of the second segment reaches 

 the postlateral angle and is much wider in the 



FIG. 13. Idotea stenops. 

 (Natural size.) 



anterior portion. The epimera of the third and fourth segments are 



