80 



Aotes on certain T> rrestrial M<>Uusca. 



Fm. -i. 



In February, 1867, a number of shells were collected by 

 Mr. W. M. Gabb, in Lower California, and among them two 

 species described by him as CylindreUa Newcombiana and C. 

 irregularis, and figured in the American Journal of Conchology, 

 iii. -J.',:- 238, pi. 16, figs. 3-4. 



Several months ago, Dr. Newcomb sent to me a specimen of 

 the former Bpeciee : from its general aspect I doubted its being 

 a CylindreUa, and suggested to him that the presence or absence 

 of a jaw would determine the question. Recently Mr.Tryon 

 kindly forwarded to me three specimens containing, to my sur- 

 prise, the living animals. Having perused the pa- 

 per of Crosse and Fischer on Eucalodium, and my 

 attention having been directed to the different char- 

 acters of the land shell faunas of Lower California 

 and Mexico east of the Gulf, I examined the ani- 

 mal of Gabb's, G. Newcombiana, with much inter- 

 est. I obtained the jaws and lingual ribbons from 

 two of the specimens, and have little hesitation in 

 placing the species in the genus Eucalodium. The 

 following is a copy of < rabb's descripl Ion, and the an- 

 nexed figure (fig. 2) was drawn 1 > \ Morse from one 

 »"• of the living specimens: 



Cylindrdla (Wrocoptis) JVewcotnbiat.a Gabb. 



"Shell moderately large, not decollate, Blender, tapering more 

 rapidly below than near the apex, the firsl three whorls being of 

 the same size; whorls lH, flattened on the side, body whorl bud- 

 angular below, detached from the penultimate whorl for a short 

 distance, and acutely angular above; suture impressed; aperture 

 slightly advanced and surrounded by broadly expanded lips, pro- 

 ducing a trumpet-shaped appearance; inner margin straight, and 

 ending in an angle above and belovi ; outer margin curved, wider 

 in advance than behind, lips continuous, broadlj expanded, and 

 somewhat thickened; surface light horn color, marked by fine, 

 irregular, nndulating and occasionally broken ribs, radiately and 



cterior of which is distantly but strongly ribbed, diminishing in diameter 

 Mil terminating st the base Ui i point, the umbilicus being imperforate. 1 

 structure in 0, ShuttL 



