172 



PROCEEDINGS OF THE ACADEMY OF 



[March, 



the cirri armed in this manner might be designated as ctenopod; those 

 with cirri in transverse brushes as lasiopod forms. 



Octolasmis antiguce Stebbing 2 (which Annandale 3 considers to be a 

 form of 0. hoeki Stebbing), differs by the longer, very strongly arched 

 carina and smaller tergum. It is from the maxillipeds of Palinurids. 



Octolasmis occlusa Lanchester, from Kelantan, is not unlike these 

 species, but the segments of the scutum are more separated, of some- 

 what different shape, the carina is much more bowed, and the smaller 

 terga are acute above. 



" Pcecilasma" tridens Aurivillius is evidently a member of this group 

 of Octolasmis, and not a PcecUasma. 



By its fully calcified plates, 0. prototypus is the most primitive of 

 its group. 



Fig. 1. — Scalpellum hendersoni. 



Figs. 2, 3. — Octolasmis prototypus. 



In the course of dredging along the northern border of Florida Strait, 

 in the yacht "Eolis," cruise of 1910, Mr. John B. Henderson obtained 

 the new Scalpellum, here described. 



Scalpellum hendersoni n. sp. Fig. 1. — The capitulum is com- 

 pressed above, swollen across the lower whorl of plates; white; the 

 length slightly more than double the width; both margins are arched, 

 but the carinal more than the occludent. Plates fully calcified, 

 marked with concentric growth-lines and on the scutum, tergum and 

 upper latus, a few weak radial striap. 



2 Annals and Magazine of Natural History (6), XV, p. 18, pi. 2. 

 3 /. c, p. 217. 



