HAWAIIAN CIRRIPEDIA. 



185 



ALEPAS Rang. 



Nude, leathery forms, with a single filamentous appendage on each Bide, and a long, niany- 

 jointi-d caudal appendage. About a dozen species hitherto known are mostly from deep water. 



The primary division of the genus should be into those forms which have the endopodite or both 

 rami reduced on the fifth and sixth pairs of cirri, and those in which the rami are not reduced and are 

 subequal in all. In .1. rc.r, described below, the lifth and sixth endopodite,- are so specialized. In 

 .1. pi rmrinata they are unreduced and subequal. 



The forms taken by the Albatross were seated upon large sea-urchin spines and gorgonians on a 

 bottom of fine sand and mud, such as sea urchins ordinarily inhabit. 



Alepas percarinata, n. sp. 



[PI. iv, fig. 8.] 



The capitulum is irregularly ovate, dorsally carinated, much longer than the slender peduncle, 



straightened on the occludenf margin, without trace of calcareous or chitinous plates. Color pale brown. 



The orifice is very small, not protuberant, less than half the length of the capitulum, with puckered 



Fig. 2. Alepas pi rcarinata. \. cirri of the left Bide; b, maxilla; i . mandible; i>. mandible of specimi a from station 3828. 



lips. The dorsum is acutely carinated, the edge of the keel smooth. The surface is finelj wrinkled 

 transversely. The short slender peduncle is coarsely wrinkled, and sparsely warty, a few scattered 

 warts also appearing on the adjacent base of the capitulum. 



Length of capitulum 9 mm.; breadth 7 mm., diameter 5 mm. Length of orifice 3 mm. ; length .if 

 peduncle l mm., diameter 2 mm. (Cotype, station 4116.) Another specimen (station 3866): Length of 

 capitulum li'.o mm., breadth 10 mm., diameter 6 nun. Length of orifice 1 mm. Length of peduncle 

 5 mm., diameter 3-5 mm. 



Mandible with three teeth and (wo spines at tin- lower extremity. The upper tooth i- largest, the 

 second about midway of the toothed margin: the third is more slender. The lower edge- of the second 

 anil third teeth are denticulate by the projection of short colorless spines. The lover border of the 

 mandible is densely pilose (fig. 2. c). 



