NO. 1770. 



A NEW HAWAIIAN ISOPOD — RICHARDSON. 



647 



C_3 



angle and has the posterior margin drawn out in small lamellae . The 

 last pair is tuberculate at the base. 



The male has all the segments of the thorax defined and distinctly- 

 separate. Each is provided with a median ventral boss. The head is 

 small and rounded and provided with eyes. The first 

 pair of antennae are composed of two articles; the 

 second pair are composed of four articles. The seg- 

 ments of the abdomen are fused in the middle of the 

 dorsal surface, but are indicated 

 laterally by five incisions on either 

 side, the last incision being very 

 slight. The pleopods and uropods 

 are rudimentary. 



Two specimens, a male and a 

 female, were collected by the U. S. 

 Bureau of Fisheries steamer Alba- 

 tross, at station 3884, Pailolo Chan- 

 nel, between Maui and Molokai islands, Territory of 

 Hawaii, at a depth of 277 to 284 fathoms in globige- 

 rina ooze. They were parasitic on Pilumnoplax cooki 

 Rathbun, having been found in the branchial cavity. 

 Type.— Cat. No. 40897, U.S.N.M. 

 Only one species of the genus has been previously described, the 

 type, Scyracepon tuberculosa Tattersall, a parasitic on ScyramatJiia 

 carpenteri Norman, and found at Tearaght, County Kerry, Ireland. 



a Fisheries, Ireland, Sci. Invest., 1904, vol. 2 [1905|, pp. 36-37, pi. 11, figs. 9-12; 

 p. 78. 



Fig. 5.— Scyracepon ha- 

 waiiensis. Second leg 

 of female. 



Fig. 6.— Scyrace- 

 pon HAWAIIENSIS. 



Male. 



