57 o bartsch: northwest coast mollusks 



Micranelhim pedroense Bartsch is a shallow water form known to 

 range from San Pedro to San Diego. M. catalinense is a deep water 

 species, known from about 50 fathoms from Santa Rosa and Catalina 

 Islands. M. profundicolwn is a deep water form known from 55 to 

 199 fathoms off San Diego. M. harkleyense has so far been recorded 

 only from Barkley Sound in 8 to 32 fathoms, M. oregonense only from 

 shallow water, at Forrester Island, Alaska, and M. rosanum only from 

 a station off Santa Rosa Island in 48 fathoms. M. crehricinctum Car- 

 penter is a shallow water species abundantly distributed from IVIon- 

 terey to Lower California. 



Turbonilla (Chemnitzia) engbergi, sp. nov. 



vShell small, elongate conic, thin, semitransparent, bluish white. 

 Nuclear whorls decollated. Postnuclear whorls moderately rounded, 

 appressed at the summit, marked by broad, slightly protractively slant- 

 ing axial ribs, of which fourteen occur upon all of the remaining turns, 

 except the last, on which there are sixteen. These ribs are a little 

 broader than the spaces that separate them, and they become slightly 

 flattened and weaker toward the summit. The intercostal spaces are 

 deeply depressed pits, which terminate somewhat posterior to the 

 summit of the succeeding turn, leaving a broad, smooth band at the 

 suture. Suture strongly constricted. Periphery of the last whorl 

 well rounded, not crossed by the strong axial ribs. Base short, well 

 rounded, marked by incremental lines only. Aperture subquadrate, 

 posterior angle obtuse ; outer lip thin ; inner lip slightly sinuous, decidedly 

 obliqueh' inserted, the inner edge having a decidedly protractiye slant; 

 parietal wall deyoid of callus. 



The type and another specimen, Cat. No. 334489, U. S. N. M., were 

 collected by Dr. C. C. Engberg at San Juan Island, in the Gulf of 

 Georgia. The type has almost 8 whorls remaining and measures: 

 altitude, 3.7 mm.; diameter, i.i mm. Four additional specimens from 

 the same station are in Dr. Engberg' s collection. 



This species occurs considerably farther nbrth than any heretofore 

 known Chemnitzia. 



Odostomia (Amaura) engbergi, sp. noy. 



Shell elongate oyate, yellow, a little paler toward the tip. Nuclear 

 whorls eroded in all the specimens seen. Postnuclear whorls narrowly 

 tabulatedly shouldered at the summit, quite strongly roimded, marked 

 by yer}^ fine slightly slanting lines of growth and equally fine spiral 

 striations, the combination, when yiewed under the microscope, giving 

 to the surface a cloth-like texture. Suture strongty marked. Periph- 

 ery of the last whorl inflated, strongly rounded. Base strongly 

 rounded. Aperture narrowly oyate; posterior angle very obtuse; outer 

 lip thin ; inner lip short, very oblique, somewhat sinuous, reflected over 



