NO. 2288. NEW MOLLUSKS OF THE FAMILY TURRITIDAE—DALL. 15 

 CLATHRODRILLIA CASTIANIRA, new species. 



Plate 2. fig. ]. 



Shell small, white, apex eroded, having five or more whorls exclu- 

 sive of the (lost) nucleus; whorls well rounded, anal fasciole exca- 

 vated, close to the appressecl suture; spiral sculpture of (on the up- 

 per whorls in front of the fasciole, three, on the last whorl about a 

 dozen between the fasciole and the end of the canal) strong, equal, 

 equally spaced, rounded threads with wider smooth interspaces; 

 axial sculpture of (on the penultimate whorl 14) low riblets barely 

 reaching the base and starting from the shoulder, with subequal in- 

 terspaces, and becoming obsolete near the aperture; they are sub- 

 nodulous at the intersections with the spirals; aperture rather wide, 

 anal sulcus deep, close to the suture with a subsutural callus; inner 

 lip erased; outer lip thin, hardly varicose; canal distinct, short, re- 

 curved. Height of shell, 10; of last whorl, 6; diameter, 4.5 mm. 

 Cat. No. 214246, U.S.N.M. 



Range. — Station 3189, off Cape San Martin, California, in 218 

 fathoms, mud, bottom temperature 43.2° F. U. S, Bureau of 

 Fisheries. 



CLATHRODRILLIA AENONE. new species. 



Shell yellowish brown, of about seven whorls exclusive of the 

 (lost) nucleus, spire acute, the whorls markedly shouldered, the 

 suture strongly appressed with a strong cord in front of it; anal 

 fasciole excavated, arcuately striated, with a few obscure fine spiral 

 threads running in it; axial sculpture of (on the last whorl fifteen) 

 short prominent nearly vertical subrectangular ribs rounded above 

 and confined to the peripheral region in front of which on the base 

 of the last whorl are about twice as many thread-like ridges mostly 

 continuous over the base to the beginning of the canal; incremental 

 lines rather marked; spiral sculpture of three or four threads with 

 wider interspaces overrunning and sometimes slightly nodulating the 

 peripheral ribs ; in front of these on the base are about eight spiral 

 threads conspicuously nodulous at the intersections with the minor 

 ridges, and with much wider interspaces; on the younger shells these 

 threads are more close set, fewer and less nodulous, the minor ridges 

 inconspicuous; finally between these in the adult are more or less 

 distinct finer spiral striae; the canal is also spirally threaded with 

 a conspicuous siphonal fasciole ; aperture rather narrow with a well- 

 m.arked anal sulcus close to the suture, and on the body a prominent 

 subsutural callus; outer lip produced, sharp-edged, smooth within; 

 inner lip callous, the outer edge of the enamel slightly raised, and on 

 the canal prominent with a chink between it and the siphonal fas- 

 ciole; canal short, recurved; height (without the nuclear whorls), 



