NO. 2288. NEW ilOLLVSKS OF THE FAMILY TURRITIDAE—DALL. 73 



mental lines feeble; anal fascicle flat with faint spiral lines crossing 

 arcuate lines of growth; anal sulcus wide and shallow; aperture 

 subovate, outer lip thin, sharp; inner lip erased; pillar short, smooth; 

 axis pervious, canal distinct, wide, with no siphonal fasciole. Height 

 of shell, T; of last whorl, 4.5; diameter, 3 mm. Cat. No. 211762, 

 U.S.N.M. 



Range.— Station 2936, off Cape San Quentin, Lower California, 

 in 359 fathoms, mud, bottom temperature 49° F. ; U. S. Bureau of 

 Fisheries. 



The enlarged figure of this little species is curiously like a Chryso- 

 domus. 



ZETEKIA DENTICULATA Dall. 



Plate 1, fig. 1. 

 Zetekia deniiculata Dall, Proc. U. S. Nat. Mus., vol. 54, No. 2238, p. 320, 1918. 



Shell small, fusiform, purplish brown, with a very small smooth 

 translucent nucleus of about three whorls, and four subsequent 

 whorls; suture obscure, closely appressed; spiral sculpture of (be- 

 tween the sutures six) flattish equal close-set uniform cords, of which 

 there are about 14 on the last whorl, with a few smaller threads on 

 the canal; these cords are cut into squarish granules by numerous 

 narrow axial grooves the interspaces on the earlier whorls having a 

 somewhat riblike aspect; this sculpture is fairly uniform over the 

 entire shell except the nucleus ; there is no evident anal fasciole ; aper- 

 ture narrow, anal sulcus prominent, rounded; outer lip internally 

 thickened and with about six short coarse lirae; inner lip callous, 

 with four or five short lirations on the pillar, canal very short, deeply 

 cut, contracted. Height of shell, 6; of last whorl, 3.5; diameter, 2 

 mm. Cat. No. 274109, U.S.N.M. 



Range. — In beach drift at Panama ; James Zetek. 



This shell, though apparently Pleurotomoid, has much the ap- 

 pearance of a Mitromorpha. of whidi the type is M. fllosa Carpenter,^ 

 not M. lirata A. Adams, as stated by Fischer and Cossmann. The 

 genus is described correctly by Adams as having a single inconspicu- 

 ous plait anteriorly on the pillar. This plait only appears in com- 

 pletely adult individuals, as do the small internal denticulations of 

 the outer lip. There is no notch at the posterior commissure of the 

 aperture in any of the California species, nor is one mentioned by 

 Adams in the description of M. lirata from Japan. The present 

 species has a conspicuous notch but no plication properly speaking 

 on the pillar, only small pustular lirations on the outer edge of the 

 columellar callosity. Cossmann gives the genus two strong plaits on 



1 Ann. Mag. Nat. Hist., vol. 15, March, 1865, p. 182, sole species M. filosa Carpenter. 

 A.. Adams's description was printed in the April number, p. 322. 



