ball: mollusca and braciiiopoda. 263 



apparently coufiued to the periphery : these are crossed by t\ro strong spiral 

 threads, the posterior largest and forming oblong tumid nodules at the intersec- 

 tions ; the anterior thread is also but less conspicuously nodulous or undulated ; 

 the rest of the surface is covered with fine spiral threads, of which tliere are three 

 between the two large ones above mentioned ; the base of the last whorl lias fourteen 

 coarse spiral threads with one to three finer intercalary threads ; anal sulcus very 

 deep and wide; outer lip thin, sharp, much produced; pillar smooth, twisted, 

 obliquely attenuated in front with an impervious axis; canal long, moderately 

 narrow, slightly recurved. Lon. of shell, 29.0; of aperture, 15.5; max. diam. 

 9 mm. 



U. S. S. "Albatross," station 3017, Gulf of California, off Cape Lobos, in 5S 

 fathoms, mud, bottom temperature 51°. 8 F. U. S. N. Mus. 110,601. 



This species belongs to the group of T. fusinella, from which it differs by the 

 obliquity of the ribs and the disparity in size between the peripheral spiral cords, 

 which are quite equal and equally nodulous mfusinella. 



Ttirris (Surcula) notilla Dall, n. 6p. 



Shell small, solid, fusiform, the spire acute and slightly longer than tlie aper- 

 ture ; whorls ten, beside the (lost) nucleus, covered with a conspicuous olivaceous 

 periostracum ; suture appressed, with a strong spiral cord between it and the 

 somewhat excavated anal fasciole which is sculptured by several sharp spiral in- 

 cised lines; from the shoulder extend about eighteen slightly protractive axial 

 rounded riblets, stoutest at the shoulder, diminishing forward, and extending nearly 

 to the canal, with narrower interspaces; these are crossed by about eigiiteeu 

 larger spiral cords on the last whorl, seven of which are on the body of the whorl 

 and the rest on the beak and canal ; the former are turgid where they cross the 

 ribs, and in the interspaces have one to tliree much finer threads; the latter are 

 more or less undulate, but have hardly any or no spiral secondary threads ; anal 

 sulcus, shallow and wide; aperture rather narrow, outer lip produced, thin, 

 simple; pillar lip smooth, whitish ; pillar straight, obliquely attenuated in front; 

 canal rather short and wide. Lon. of shell, 26 ; of aperture and canal, 12 ; max. 

 diam., 9 mm. 



Found with the last-mentioned species. U. S. N. Mus. 110,602. 



This and the following species show characters connecting them with Drillia, 

 especially such species as D. alesidofa Dall, and D. polytorta Dall, from the 

 Carolina coast of the Atlantic. 



Turris (Surcula) dotella Dall, n. sp. 



Shell in general appearance resembling the last species but more acute and 

 slender, the ribs only fourteen in number on the last whorl, straighter, sharper, 

 with wider interspaces, crossed by, on the body of the last whorl, about a dozen 

 similar, regular low ridges with narrower interspaces, the whole regularly and 



