114 LAND SHELLS. 



No. 4. HELIX DUPETITHOUAESI, Deshayes. 



Testa orbiculato-conoidea, lasvigata nitens, subindentata, et lineis volventibus obscuris notata ; 

 colore castanea, fasciis duabus albis zonam nigram aut rufam includentibus induta ; anfr. 7-8 

 convexiusculi ; sutura impressa ; umbilicus profundus, partem quintam diametris minoris requans ; 

 apertura rotundata, intus castanea, trifasciata ; labrum album, incrassatum, reflexiusculum, 

 umbilicum aliquantum occultans. 



SYNONYMS AND REFERENCES. 



Helix Dupetiihouarsi, Deshates, Revue Zoologique, p. 360, anno Dec. 1839. 

 " Guerin. Mag. de Zool. 1841, pi. xxx. 



" in Fer. Hist. I, p. 169, pi. xcvii, f. 8-10. 



Chemnitz, ed. 2, p. 328, t. viii, f. 6, 7. 

 Pfeiffee, Monog. Hel. Viv. I, 338.— In. IH, 229. 

 Reeve, Con. Icon. 659. 

 Helix oregoncnsis, Lea, Am. Phil. Soc. VI, p. 100, t. xxiii, f. 85, anno 1839. 

 Pfeiffek, Monog. Hel. Viv. I, 428.— Ib. Ill, 272. 



DESCRIPTION. 



Animal. — Not bitberto observed. 



Shell. — Subglobose, depressed ; spire more or less elevated, sometimes quite flat ; whorls 

 seven, rounded in some instances, crossed by minute revolving lines. Suture moderately im- 

 pressed ; aperture ovate ; lip wbite and thickened, reflected at its connexion with the large and 

 deep umbilicus, which it partially conceals. On the columella there is a slight deposition of 

 callus. Epidermis smooth and shining, in some individuals marked lightly in parts by the 

 peculiar indentations characteristic of the California helices. Color variable, generally of an 

 uniform dark chestnut or light fawn, with a broad black band on the body whorl, enclosed above 

 and below by white bands of equal breadth, which are concealed in the suture of the upper 

 whorls. 



Greatest diameter, 25 ; lesser, 20 ; altitude, 13 millimetres. 



Geographical distribution. — Found by Dr. Newberry at San Francisco and Benicia, in Cali- 

 fornia, and on the shores of Klamath lake, in Oregon Territory. It seems to be one of the 

 commonest and most widely distributed species of the Pacific region. 



Remarks. — This shell is readily distinguished from others of the same habitat by its very 

 smooth and shining epidermis, unusually free from any granulations or indentations. Tbe in- 

 dentations, when present, cross the incremental wrinkles of the surface at regular intervals, 

 giving the appearance of broad, revolving lines. It is a beautiful and very distinct species. 



There can be no doubt but that the figure and description of H. oregonensis, Lea, were drawn 

 from an immature specimen of this shell. Although they appeared in the same year as those 

 of M. Deshayes, the latter have, of course, the priority, being made from the mature shell. 



