THE NAUTILUS. 81 



late-colored, and ending below in a short, open canal. Outer lij) 

 thickened, arcuate, and five-dentate within. Inner lip smooth, 

 covering the columella. Canal open, short, and a little deflected to 

 the left. Umbilical region closed by the extending columellar 

 callous. 



Alt. 17, diam. 10 mill. Aperture alt. 7 (excluding canal), diani. 

 4 mill. 



This is a distinct little shell and not referable to any species with 

 which I am acquainted. Its nearest ally appears to be Ocinebra 

 ciramitexta Stearns, from which it is separated by its more pointed 

 elongated spire, and absence of the two brown bands. The ribs in 

 circumtexta are not so well developed, and the spiral lirse are not 

 so coarse. There are seventeen spirial lirse upon circumtexta, 

 whilst upon jenksii there are but ten. The greatest difference, 

 however, is in the embryonic whorls, which in circumtexta are dis- 

 tinctly bicarinate, while in jenksii they are rounded. It bears some 

 superficial resemblance to Ocinebra graciUima Stearns, but is sep- 

 arated tVom that species by its more angular form. The ribs, too, 

 are more numerous in gracilUvia, and the canal is closed. The 

 embryonic apex in graciUima is corrugated whilst that of jenksii is 

 smooth. It is separated from Ocinebra michaeli Ford, by its much 

 shorter canal, more rotund form, and thickened lip. 



I have seen but four specimens of this species, obtained from the 

 Wagner Collection at the AVagner Free Institute of Science, and as 

 they show little or no variation, I am led to believe the characters 

 are quite constant. 



I am indebted to the kindness of Mr. C. ^V. Johnson, assistant 

 curator, Wagner Free Institute of Science, for the privilege of 

 studying and describing the species. The types are now deposited 

 in the Wagner Collection. The habitat is unknown. 



I take great pleasure in naming this interesting little species in 

 honor of Prof. J. W. P. Jenks, Curator-iu-Charge of the Museum 

 at Brown University, Providence, R. I. 



HELIX (STENOTREMA) HIRSUTA SAY, ON THE WEST COAST. 



Of this form Mr. W. G. Binney remarks in his " Manual of 

 American Land Shells," page 279, " a postpliocene species now found 

 .o\'ex the Northern and Interior regions as far as Kansas and Yir- 



