Art. 11 XEW AMERICAN MAEIXE MOLLUSKS — BARTSCH 17 



• The type, Cat. Xo. 361626, U.S.N.M., was collected by E. P. Chace, 

 at Cayucos, California. It has five postnuclear whorls and measures, 

 altitude, 2.9 mm. ; diameter, l.S mm. 



ODOSTOMIA (CHRYSALLIDA) CATALINENSIS, new species 



Plate .3, fig. 4 



Shell minute, bluish white, semitranslucent. Nuclear whorls 

 deeply obliquely immersed in the first postnuclear turn, above which 

 the tilted edge of the last turn onh' projects. Postnuclear whorls 

 moderately rounded, marked by four strong spiral cords which are 

 much wider than the spaces that separate them. Of these the first 

 is at the summit. The axial sculpture is decidedlj?^ reduced on the 

 first turn, becoming stronger on the second, while on the third there 

 are 18 axial ribs which equal the spiral cords in strength. The junc- 

 tion of the axial ribs and spiral cords here form strong tubercles on 

 the anterior three spiral cords, while the fourth is only slightly tuber- 

 culated. On the last whorl the axial ribs are very irregular and en- 

 feebled. Here the axial sculpture consists chiefly of lines of growth, 

 which are particularly conspicuous in the grooves between the spiral 

 cords, where they appear as slender riblets. Particularly is this true 

 in the groove at the periphery. Periphery well rounded. Base 

 moderately long, well rounded, marked by seven spiral cords which 

 grow successively narrower from the periphery toward the base, the 

 last one at the base being a little wider than those immediately pre- 

 ceding it. Aperture oval, somewhat effuse anteriorly ; posterior angle 

 obtuse; outer lip thin, showing the external markings within by 

 transmitted light; columella, slightly oblique, strongly reflected and 

 appressed to the base, leaving only a very small chink at the umbilical 

 area, and provided with a strong oblique fold at its insertion ; parietal 

 wall covered with a moderately thick callus. 



The type. Cat. No. 347989, U.S.N.M., was collected by A. M. Strong, 

 on Abalone at Catalina Island, California. It has four and one-half 

 postnuclear whorls and measures, length, 3.1 mm.; diameter, 1.6 mm. 



Twenty- four additional specimens from the same locality are in 

 the Museimi collection as Cat. No. 347990. 



More than a hundred additional specimens from the same locality 

 are in Mr. Strong's collection. 



ODOSTOMIA (EVALEA) BACHIA, new species 



Plate 2, fig. 7 



Shell very regularly elongate ovate, bluish white. Nuclear whorls 

 deeply obliquely immersed in the first of the postnuclear turns above 

 which a small portion of the tilted edge of the last turn only pro- 

 20441—27 3 



