302 AMERICAN JOURNAL 



elevated, forming rounded tubercles. Foot margined with orange. 

 Dorsal tentacles small, compressed, oblong, ovate, tips rounded, 

 erect and furnished with about twelve very oblique coarse 

 lamellpe, retractile into simple cavities, the upper and anterior 

 portions bright orange red. 



Labial tentacles fused into a veil, which is notched in front. 

 Branchial star large, non retractile, wider than the body and 

 consisting of twelve or more suberect, bipinnate plumules, of a 

 narrow lanceolate form, encircling the vent, which is a simple 

 orifice, rachis of the plumules bright orange red. Foot large, 

 very thin, much wider than the body, truncate in front, widest 

 on the posterior half, lance pointed behind and projecting con- 

 siderably behind the body. 



Length, two and a half inches. 



Habitat. Island of Huaheine. 



GoNiOBRANCHUS ALBOMACULATUS, Pease. Plate 20, fig. 2, a,b,c. 

 American Jour, of Conch., vol. 2, 1866, p. 204. 



BoRNELLA ARBORESCENS, Pease. Plate 20, fig. 3, a,b,c. 



Body smooth, subpellucid, elongate, rounded above, somewhat 

 compressed, tapering posteriorly into a bifid tip. Branchial 

 processes six on each side of the back, opposite, cylindrical, 

 tapering to a point, the first trifid, the succeeding four bifid, and 

 the last simple ; from the inner axillae of each process arises 

 small, pinnate branchiae. The head furnished anteriorly with 

 two stellated processes, the rays being about ten or twelve in 

 number, unequal in size. Mouth just in front of the locomotive 

 disk, and between the stellated processes. 



Tentacles compressed, lanceolate, pinnate, retractile into 

 large cylindrical tapering sheaths, which terminate in four un- 

 equal tapering branches. Foot or locomotive disk narrow and 

 grooved. At the base of the tentacular sheaths are immersed 

 two black specks, which, possibly, may be eyes. Color pale 

 cream yellow, finely reticulated with orange and the upper por- 

 tion of all the processes zoned with orange red. Foot color- 

 less. 



Length, one and a half inches. 



Habitat. Tahiti. 



Remarks. In addition to the two species collected by Mr. 

 Adams, during Voy. Samarang, on which the genus was founded, 

 two others have been discovered inhabiting Ceylon and South 



