1899.] NATURAL SCIENCES OF PHILADELPHIA. 395 



riblets. Whorls 4^, very convex, the last well rounded. Aper- 

 ture somewhat oblique, subrotund. 



Alt. 2.8, diam. 3.7 mm. 



Uruapam, State of Michoacan, Mexico. * 



About twenty specimens were collected at the above locality by 

 Mr. and Mrs. Rhoads. Several immature shells of the same 

 species were taken at Morelia, ]\Iichoacau, and a few occurred at 

 Patzcuaro and Huingo in the same State. In Michoacan it seems 

 to replace T. conqmrcatella of the more tropical region eastward. 



T. impum (Ytr.) and 2'. hornii (Gabb) are closely allied species, 

 the former ditleriug in the absence of oblique cuticular lamina?. 



A Thijsanophora similar to T. cceca, but more elevated, was 

 collected at Morelia, ^lichoacau. If the high contour is constant, 

 it probably indicates another subspecies at least; but only one 

 specimen was obtained. 

 Omphalina montereyensis n. ?p. 



Shell about the size and general contour of 0. inornata, de- 

 pressed, umbilicated, the umbilicus about one-twelfth the diameter 

 of the shell. Surface glossy, smooth, with slight growth-wrinkles, 

 but no other sculpture. Whorls 5^, rather flattened, and slowl}' 

 increasing, the last Avhorl very much wider, more than double the 

 width of the preceding one, rounded at the periphery ; rather 

 flattened beneath. Aperture oblique, broadly lunate oval. 



Alt. H, diam. 12; oblique height of aperture 5, width 6 mm. 



Diente, near Monterey, State of Xuevo Leon, Mexico. 



Numerous specimens were collected. It somewhat resembles 

 0. pamdensis Pfr., but is much more depressed. 

 Glandina rhoadsi n. sp. 



Shell oblong-fusiform, rather thin, glossy, reddish brown, with 

 some slightly darker longitudinal streaks and whitish lines. 

 Surface weakly and rather unevenly striated longitudinally, the 

 strife stronger near the suture; no spiral sculpture. Spire elongated, 

 with slightly convex outlines; apex obtuse; whorls 7^ to 8, the 

 earlier ones regularly widening, the later two or three more rapidly 

 increasing; sutures moderately impressed, very slightly crenulated 

 by the fold-strite; not margined. Last whorl somewhat com- 

 pressed, tapering below. Aperture small, rather narrow, a little 

 less than one-half the total length of the shell, in adult shells; 

 columella only weaklv concave. 



