20 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



the suture over the whorl to the canal, constricted over the nar- 

 row anal f asciole and feebler on the anterior part of the last whorl ; 

 these ribs are cut into subnodulous segments by deep narrow sharp 

 spiral grooves, with mu^h wider interspaces, two or three on the spire, 

 nine or ten between the f asciole and the canal on the last whorl ; on 

 the canal are five or six coarse close-set threads; aperture (probably 

 not quite mature) rather narrow, anal sulcus narrow, not deep; 

 outer lip thin, sharp, prominently arcuate; inner lip erased; pillar 

 short, twisted, canal short, hardly differentiated. Height of shell, 

 13.5; of last whorl, 6.5; diameter, 5 mm. Cat. No. 268911, U.S.N.M. 



Range. — Dredged at Agua Verde Bay, Gulf of California, by Dr. 

 Paul Bartsch. 



In the adult the aperture would doubtless be more elaborated. 



? CLATHRODRILLA (KYLIX) ALCYONE, new Bpecies. 



Plate 2, fig. 3. 



Shell small, slender, acute, white, polished, with about nine whorls 

 (the nucleus decorticated) ; suture distinct, not appressed, the anal 

 fasciole adjacent to it with no thickened cord between; whorls well 

 rounded but the fasciole flattish; spiral sculpture of (on the early 

 whorls two, on the last whorl about 15) sharply incised lines in front 

 of the shoulder cutting the ribs into squarish segments which are 

 hardly nodulous; on the canal there are a few finer closet-set threads; 

 axial sculpture of (on the penultimate whorl about 21) rounded some- 

 what sigmoid ribs, extending from the suture to the base, feeble on 

 the fasciole and base and obsolete on the last half of the last whorl ; 

 anal fasciole wide and showing the arcuate posterior ends of the ribs 

 which do not undulate the suture ; aperture narrow, anal sulcus wide 

 and rounded with slightly flaring edge ; outer lip thin, sharp, promi- 

 nently arcuately produced ; inner lip erased, pillar strong, attenuated 

 in front, canal distinct, narrow, somewhat recurved. Height of shell, 

 15; of last whorl, 8; diameter, 4.5 mm. Cat. No. 223150, U.S.N.M. 



Range. — Station 3016, on the west coast of Mexico off Cape Lobos, 

 in 76 fathoms, mud, bottom temperature 59° F. U. S. Bureau of 

 Fisheries. 



This species resembles C. alcmene, but is more slender, less nodu- 

 lous, and without the prominent band in front of the suture. It has 

 every appearance of being adult, though it has not the characteristic 

 Clathrodrillia aperture and color and should it prove that this is the 

 normal condition these two species might form a distinct section 

 characterized by the incised sculpture, simple aperture and more 

 delicate shell, which might take the sectional name of Kylix. It is 

 not certain that either species is operculate like the true Clathro- 

 drillia. The present species might be regarded as the type. The 

 name will date from 1918. 



