36 PROCEEDINGS OF THE NATIONAL MUSEUil. vol.56. 



more at the peripherj^; on the anterior one the suture is laid and 

 it also forms the anterior boundary of the dark coloration; on the 

 base are about five less conspicuous threads; all these have much 

 wider interspaces; axial sculpture of moderately conspicuous incre- 

 mental lines; anal sulcus wide and extremely shallow, the deepest 

 portion at the posterior keel ; there is no well defined fascicle ; aper- 

 ture short and wide, outer lip thin, only slightly produced in front 

 of the sulcus; inner lip erased; pillar verj^ short; canal very short 

 and wide, but distinct, slightly recurved and with an inconspicuous 

 siphonal fasciole. Height of five whorls, 12; of last whorl, 7; 

 diameter of decollation, 1.7; of last whorl, 4.5 mm. Cat. No. 

 212329a, U.S.N.M. 



Range.— Station 3179, off Drakes Bay, California, in 30 fathoms, 

 mud, bottom temperature 50° F. U. S. Bureau of Fisheries. 



This form might be taken for a variety of A. hriseis, but is dis- 

 tinguished by its more emphatic and somewhat different sculpture, 

 its white base, and the short pillar and canal. The anal sulcus is 

 much more shallow and the outer lip less produced. 



ANTIPLANES AMYCUS, new species. 



Plate 11, fig. 5. 



Shell white, covered ^^ith a brownish olive periostracum ; witii five 

 or more moderately rounded whorls exclusive of the (lost) nucleus; 

 suture distinct with a wide rounded ridge in front of it, forming the 

 posterior boundary of the anal fasciole ; spiral sculpture of a few ob- 

 scure threads on the fasciole and in front of the shoulder 8 or 9, on 

 the last whorl 15 to 18 flattish, rather close-set threads smaller and 

 closer anteriorly and absent from the canal ; axial sculpture of more 

 ■or less distinct incremental lines, and on the upper spire of about 

 15 very oblique anteriorly protracted riblets chiefly visible at the 

 :shoulder and obsolete on or entirely absent from the last two whorls; 

 anal sulcus wide, deep, rounded, the fasciole slightly impressed ; outer 

 lip thin, sharp, arcuately produced; inner lip erased, pillar short, 

 white, obliquely attenuated in front; canal short, wide, distinct, 

 slightly recurved. Height of fovir whorls, 21.5; of last whorl, 15; 

 diameter at decollation, 3; of last whorl, 9.5 mm. Cat. No. 226163, 

 U.S.N.M. 



Range. — Station 3670, in Monterey Bay, California, in 581 fathoms, 

 mud, bottom temperature 37.8° F. U. S. Bureau of Fisheries. 



ANTIPLANES SANTAROSANA Dall. 



Plate 11, fig. 3. 



Pleurotoma (Antiplanes) santarosana Dall, Proe. U. S. Nat. Mus., vol. 24, 

 No. 1264, p. 515, March, 1902. 



Range. — Off Santa Rosa Island, California, in 53 fathoms, sand. 



