NO. 2288. NEW MOLLUSKS OF THE FAMILY TURRITIDAE—DALL. 75 

 CYTHARELLA SUBDIAPHANA Carpenter. 



Plate 24, fig. 4. 



Manoelia subdiaphana Cabpentee, Ann. Mag. Nat. Hist., ser. 3, vol. 15, p. 45, 

 July, 1864. 



Range. — Cape San Lucas; J. Xantus. 



The specimen figured is Carpenter's type, Cat. No. 274104, 

 U.S.N.M. This is one of the species with an elevated spire which 

 approaches Philhertia. 



CYTHARELLA LOUISA, new species. 



Plate 24, fig. 3. 



Shell minute, nucleus with a small apex, the whorl later swollen, 

 the second turn with three strong spiral threads, the following three 

 whorls with 11 or 12 axial ribs with subequal interspaces and no 

 pronounced shoulder; spiral sculpture between the sutures of three 

 strong subequal flattish threads somewhat swollen when they over- 

 ride the ribs, and with a few much finer threads in the interspaces 

 between the major threads; the spaces between the reticulation on the 

 earlier whorls are deep and have a pitlike aspect; near the suture 

 in fresh specimens is a dark spiral band extending to the rounded 

 shoulder, in front of which the shell is yellowish white with (on the 

 last whorl) four or five narrow brown spiral lines with much wider 

 interspaces; aperture moderately wide with a very shallow ill- 

 defined sulcus, the outer lip thickened, smooth, the canal wide, not 

 differentiated from the aperture, the inner lip smooth. Height of 

 shell, 4.25; of last whorl, 2.7; diameter, 1.7 mm. Cat. No. 160122, 

 U.S.N.M. 



Range. — San Luis Obispo, California, Mrs. Dial. 



CYTHARELLA QUADRISERIATA. new species. 



Plate 24, fig. 8. 



Shell small, stout, blunt, white, with a brown peripheral band and 

 another on the base; nucleus small, blunt, at first smooth and then 

 spirally striated, in all about two whorls followed by five subsequent 

 whorls ; axial sculpture of eight rounded ribs, partly continuous up 

 the spire, undulating the suture and with subequal interspaces ; faint 

 lines of growth cross the transverse sculpture ; spiral ornamentation 

 of almost microscopically fine threads uniform over the shell, with 

 wider flat interspaces ; aperture short and wide with no differentiated 

 canal: anal sulcus conspicuous, outer lip thickened, smooth inside. 

 Height, 5; of last whorl, 3; diameter, 2 mm. Cat. No. 55503, 

 U.S.N.M. 



Range. — Gulf of California to Acapulco. 



