ISOPODB OF NORTH AMERICA. 



407 



Icnoth of tho seo-inents, while tho.sc of the last three segments are 

 l)road, with tlH'ir posteiior aiit^les produced beyond the segments. 



The abdomen is composed of four segments, three short ones and 

 the terminal segment, which bears suture lines indicative of another 

 coalesced segment. The terminal segment is rounded poste^iorl3^ 

 The anterior three-fourths of the s(>gment is raised consideralily above 

 the posterior fourth, which is flat, and there is a groove in the median 

 line on the posterior third of the anterior part of the segment. 



The legs are similar to those of the type species of the gemis. The 

 three anterior pairs increase in length, the third pair being the longest, 

 and all are directed anteriorly. The fourth pair are very short and 

 fold across the body. The last three pairs increase in length, the 

 seventh pair l)eing the longest, and all these are directed posteriorly. 

 The legs are compact and lie folded on the ventral side and can not be 

 seen from a dorsal view. 



There is but one specimen collected bj^ the U. 8. Bureau of Fisheries 

 steamer A/hatross in 1888 at Magdalena Bay, Lower California; depth 

 12 fathoms. 



T>/j?e.— Cat No., 22578, U.S.N.M. 



CLEANTIS HEATHII Richardson. 



Cleantis heathii Richardson, Proc. U. S. Nat. Mus., XXI, 1899, pp. 851-852; 

 Ann. Mag. Nat. Hist. (7), IV, 1899, p. 272; American Naturalist, XXXIV, 

 1900, p. 229. 



Locality. — Monterey Bay, Lower California. 

 Body slender, elongate; surface smooth. 

 Head with lateral margins straight; anterior margin 

 slightly excavate. Eyes small, lateral. First pair of 

 antenna? consist of four joints and are a little longer 

 than half the width of the head. The second pair of 

 antenna? are half as long as the body and are composed 

 of nine joints, the three terminal ones 

 forming the flagellum, which can not be 

 distinguished from the peduncle. Palp 

 of the maxillipeds composed of four 

 articles. 



Thoracic segments subequal, with nar- 

 row epimera, those of the second, third, 

 and fourth segments reaching l)ut half 

 tlu^ length of the segments, the last three 

 epimera extending the entii-e length of 

 Fig. 457.— CLEANTIS the lateral margin. 



HE.\THII. Max- rpl ,1 . 1 /• j^I 



iLLiPED. X 77^. ^"^' abdomen is composed of three 



segments, with suture lines indicative of 

 another. The terminal segment is broadly rounded posteriorly, with 

 small but acute lateral angles. The sides are almost parallel. 



The first four pairs of legs are directed anteriorly ; the last th ree pairs 



FlC. 40<'S.— CLEANTIS 

 HEATHII. X 6|. 



