ACADEMY OF NATURAL SCIENCES. 181 



Shell openly umbilieate, depressed, yellowish horn colour, under the glass 

 regularly rib striated ; spire depressed, a little convex ; suture wide and deep ; 

 whorls four, rather cylindrical ; umbilicus large, indistinctly perspective ; aperture 

 rounded; lip simple, acute, margins approximating. 



Remarks. — Mr. Bland may possVdy refer to this species as H. striatella, An- 

 thony, which was obtained by Dr. Cooper on the Pacific side of the Rocky 

 Mountains. (See addenda to " Remarks on Classification, etc., 1863). This 

 species is certainly distiuct from striatella, by its smaller size, rib-like costa, and 

 almost channelled suture. 



A few specimens were obtained by Mr. Gabb, of the State Geological Survey, 

 in Klamath Valley, which were collected jointly by himself and Dr. Cronkhite, U. 

 S. Army. 



Heliz Rowelli, Newc. 



Hel. testa aperta-umbilicata, orbiculato depressa, alba, opaca, polita, minutis- 

 simo-oblique striata ; anfractibus quatuor vel quinque convexis, ultimo magno> 

 antice deflexo ; spira vix elevata, apice sub-mamillato ; sutura modice impressa ; 

 apertura fere circular! ; labro tenui, reflexiusculo, marginibus continuis ad junctu- 

 ram ; anfr. ultimo adnato. 



AIL - 4 pol, Diam. maj. 6 pol., min. - 5 poL 



Hab. Arizoua, (dicto Frick). 



Shell with open umbilicus, orbicular, depressed, opaque white, polished, very 

 finely obliquely striate ; whorls four and a half, convex, the last large, anteriorly 

 descending ; spire but little elevated, at the apex nrojecting like a nipple ; suture 

 moderately marked ; aperture truly circular ; lip thin, slightly reflected, margins 

 continued, adhering to the last whirL 



Remarks. — This is another of the Cyclostomoid species of which H. Carpen- 

 teri, Newc, H. Cmrulano, Muhl., and H. Angasiana, Pfr. form striking examples. 

 Our species approaches nearer in lightness of substance and in its depressed 

 form to Muhlfeldt's shell, than to either the others. 



I take pleasure in dedicating this species to the Rev. M. Rowell, of San Fran- 

 cisco. 



S&ccinea Japanica, Newc. 



S. testa ovato-conica, flavido-cornea, laevissima, striatula, nitida, pellucida ; an- 

 fractibus III, nucleo sane mamillato, ultimo 45 longitudinis fere eequante ; aper- 

 tura elongato-ovali ; peristomate simpliei ; columella, regulariter arcuata ad junc- 

 turam labro superiorem acuto-angulata. 



Long. -55, Diam. -35, Apert. long. -4, lata. -233 pol. 



Hab. Japan, (Prof. Blake). 



Shell ovately-conic, yellowish horn color, very smooth, finely striate, shining, 

 pellucid ; whirls three, nucleus truly mamillate, the last four-fifths of the entire 

 length ; aperture elongately ovate ; lip simple ; columella regularly arched ; at the 

 juncture of the lip above, acutely angular. 



Remarks on Helix Hillebratidi, Newc. 



At the time of publication of this species, but a single recent specimen had 

 been obtained, and that was freed from the epidermis. The statement that the 



