254 SIDNEY F. HABMER. 



thecal sclerites are long and conspicuous, and start from the 

 operculum. The epitheca is thick. The a opercula (fig. 21), 

 though resembling those of S. sulcata in the existence of 

 two distal teeth, differ from them in that the teeth are more 

 recurved. The base line (c) of the main sclerite bends 

 inwardly, at its proximal end, much nearer the occlnsor 

 tubercle than in S. sulcata. The operculum figured 

 measures no less than 610 ju in diameter. 



5. S. connexa, n. sp. Figs. 6, 18. 



Zocecia of large size. Cryptocyst joining the distal wall 

 close to its origin from the basal Avail, not augulated at the 

 commencement of its descending portion in young zooecia, 

 thickened and angulated in old zooecia. Roof of tube long, 

 greatly developed, the opening nearly vertical, invisible 

 from above, separated from the distal wall. Cavity of the 

 median process shallow, its walls being all strongly tuber- 

 cular. The distal border of the median process is thick, and 

 joins the condyles ; the sides are greatly developed wings, 

 slightly convex above, and unite with the sides of the zooecium 

 in such a way as to leave two foramina or '^ opesiules " 

 on each side for the passage of tendons.^ a zooecia not 

 found. B opercula broad and strong, Avith strong submar- 

 ginal teeth which begin not far from the base of the oper- 

 culum. 



John Adams' Bank, H.M.S. '' Herald," Busk Collection 

 (B. M., 99.7.1, 408). 



There is some uncertainty with regard to the position of 

 " John Adams' Bank," a locality from which, as Mr. Kirk- 

 patrick informs me, a number of specimens in the Busk col- 

 lection were obtained. The slide with this label contained 

 not only a specimen of S. connexa (the only one I have 

 seen), but also one of S. magnilabris. Busk. The latter 



' These were actually made out, passing through the opesiules. 



