Boone, Crustacea, Cruises of "Eagle" and ''Ara," 1921-28 197 



Synonymy. — Nematoscelis megalops G. 0. Sars, Forhandl. Vidensk. 

 Selsk. Christiania, No. 7, p. 27, 1883; Report ''Challenger," Schi- 

 zopoda, vol. 13, p. 127, pi. 23, figs. 5-10, pi. 24, 1885. 



ISOPODA. 

 Family: CIROLANIDAE. 



Genus : CIROLANA Leach. 



Cirolana mayana Ives. 



Plate 75, fig. A. 



Type: The species was founded on three specimens from the Port 

 of Silam and deposited in the Philadelphia Academy of Natural 

 Sciences. 



Distribution : Coast of Yucatan, Santa Marta, Colombia ; Bo- 

 queron Bay and Culebra, Porto Rico; Brandon's, Barbados; San 

 Francisco Bay, California. 



Material examined: 34 specimens, some of which are ovigerous, 

 taken at Hawk's Nest, Cat Island, Bahamas, cruise of 1928. 



Technical description : Animal small, 3 mm. long, maximum diam- 

 eter, very convex transversely. 



Head : Three-fourths as long as wide, with the anterolateral margin 

 broadly rounded; eyes large, round, compound, slightly convex, lat- 

 eral, shining black. Inner antennae short, tapering, reaching to the 

 anterior margin of the first thoracic segment. External antennae 

 extending to the posterior angle of the fifth thoracic segment, very 

 slender. The external maxilliped is composed of seven articles. The 

 mandible has a palp of three articles. 



Thorax : The first six segments are subequal in length and similar, 

 except that the first segment has the lateral parts slightly the wider; 

 the seventh segment is similar to but not quite as long as the sixth seg- 

 ment; the second to seventh segments, inclusive, have the epimeral 

 plate sharply defined, the first four epimera being approximately 

 right-angled posteriorly, while the last two have the postlateral angle 

 produced, acute. 



The first three pairs of legs are short and have the dactyli very 

 acuminate, hook-like ; the related propodi are stocky set with spinules 

 on the inferior margin; the fourth to seventh legs are increasingly 

 longer, ambulatory, the dactyl acuminate but less curved; the four 

 distal joints set with spinules. 



