VERTIGO. 



441 



Vertigo milium. 



Fig. 118. 



Shell sub-oval, wrinkled, light chestnut colored ; whorls four ; suture moder- 

 ate; aperture heart-shaped, armed with six teeth; umbilicus tree. 



Pupa milium, Gould, Bost. Joiini. iii. 402, pi. 3, fig. 2-3 (1840) ; iv. .3.''i9 (1843) ; Inv. 

 187, fig. 181 (1841 ). — De Kay, N. Y. Moll. 48, pi. 4, ivj;. 44 (184.3). — Ad.\ms, Ver- 

 mont Moll. 153 (1842). — Pfeiffer, Men. Hcl. Viv. ii. .302. — Binney, Terr. Moll, 

 ii. 337, pi. 71, fig. 1. — KusTEU, in Ciie.mn. 2d ed. 119, pi. Li, figs. 39-42. 



Vertiip milium, W. G. Binn. T. M. iv. 148. — Mouse, Am. Nat. i. 669, figs. 05, 66 (1868). 



Shell inimito, of a nearly oval form, color a light chestnut ; whorls 

 four, or somewhat more, obviously wrinkled, 

 rather convex, arranged so as to form a bluntly 

 rounded apex; suture deep; aperture half the 

 width of the last whorl, heart-shaped, the apex 

 being its right upper angle ; the transverse mar- 

 gin is nearly direct, the outer margin is scal- 

 loped by an indentation of the lip; the remain- 

 der of the margin is regularly rounded ; lip 

 white, slightly everted ; throat with six teeth, two of which are on 

 the transverse lip, equidistant ; one with a tubercle at its base, on 

 the middle of the left lij), and nearly at right angles with tlie for- 

 mer is the largest ; a fourth is on the indenture of the outer lip, 

 directed between the two on the transverse lip ; and two smaller 

 ones, more retired within the shell, are equidistant between the two 

 last mentioned ; umbilicus largo and deep. Length, less than one 

 thirtieth of an inch ; breadth, one fortieth of an inch. 



This shell I first found in November, 1839, at Oak Island, Cliel- 

 sea, after a warm rain. Professor Adams has found it in Vermont. 

 It was crawling on the damp leaves, in company with Cionclla sub- 

 cijlhidrka. From New England to Texas. 



Not finding any description answering to it, I have proposed a 

 name. It is even more minute than Carychium cxlo;iium, and is not 

 leadily detected. In size and outline it resembles P. i'ertiffo, Drap., 

 V. pusilla of other authors ; but that shell is reversed, and has a 

 different armature. The teeth are all distinct, long, compressed, and 

 very sharp. 



I have labored to make this out to be the P. ovata of Say ; but 

 on the whole I tliink the discrepancies are too important to be rec- 

 onciled. That shell is described as larger, with a semi-oval aper- 

 ture, and with seven teeth, differently arranged from those of our 

 shell. 



