THE NAUTILUS. 15 



come wider toward the base of the body whorl, making the sculpture 

 of this part of the shell lirate ; the lirse sometimes slightly grooved ; 

 otherwise sculptured by sharp, close set incremental threads, these 

 are subordinate to the spiral sculpture. Color dull cream-white 

 with two obscure rufous bands on the body whorl. Spire short, 

 obtusely conical ; whorls six ; sutures distinct, narrowly channelled ; 

 aperture about two-thirds the length of the shell, sharply angulated 

 above, rounded and effuse below, finely lirate and glossy within, 

 with a thin glazing on the body whorl. Outer lip simple. Colu- 

 mella short, with a fold curving around to and thickening the edge 

 of the lip below, which is moderately produced. 



Length of shell 11 millimetres. 



Length of body whorl 9 millimetres. 



Breadth 6 millimetres. 



The foregoing description is based on a single example in the col- 

 lection of Mr. Homer Hamlin, of Los Angeles, Cal. The above 

 form was collected by me in the same locality in the fall of 1887 

 the specimens are now in the U. S. National Museum. 



It is a more robust and solid shell than the related species punc- 

 toccelatus Cpr., which occurs in the same locality, and which is 

 found living in many localities along the shore from Monterey, 

 southerly. [ have named the above for the late Dr. John B. Trask, 

 one of the founders of the California Academy of Science, and a 

 pioneer in natural history investigations on the West Coast. 



Los Angeles, Cal., March 15, 1897. 



NOTES ON AGRIOLIMAX. 



BY T. D. A. COCKERELL. 



The accompanying figures were drawn by the writer several years 

 ago, and sent to Mr. W. G. Binney, who kindly had them engraved 

 along with others which were published in the Supplements to Terr. 

 Moll., vol. V. These three, however, were not published, and it is 

 thought well to present them at this time. 



Fig. 1 represents the head and anterior part of the man- 

 tle of a specimen of Agriolimax agrestis (L.) collected by 

 Mr. Pilsbry in Philadelphia in 1889. The mantle is 

 FIG. ]. bilobed in front, and the specimen represents the mon- 

 strosity bilobatus Ferussac. 



