152 BULLETIN OF THE 



It must 1)(> reTnoiii1)C'roil tliat iiiy figni-e f)f the dentition (PI. VIII Fig. R) 

 UTiil ilcscri]itii)ii of jaw wcii- ilrawii hum llie Halnioii lliver Kliell, not the typical 

 shell I'ouiul only in the Sierra Xevada region at " Big Trees." 



Triodopsis vultuosa, Gould, (p. 312.) 



Plate III. Fig. J. 



There are 12 ril)=^ on tiie jaw. The lingual membrane has 20-1-20 teeth, 11 

 laterals on each side of the median line. 



For the variety called HeJiriettce, see below. 



Triodopsis Copei, Wetiierhy. 



Plate I. Fig. J. 



Shell reddish, somewhat thin, deeply striated by lines of growth, and of 

 medium size. Spire somewhat depressed in some specimens, slightly more ele- 

 vated in others. Whorls 5, transversely striated with oblii|ue lines of growth, 

 and increasing very gradually and regularly in size ; a faint carina appearing 

 at the junction of the upper third and lower two-thirds of the body whorl, 

 from which the latter tapers inwardly to the base of the shell. Sutures regu- 

 larly and moderately impressed. Peristome subacute, and liroadly reflected 

 outward and downward at the lower two-thirds, and beaiing on its basal third 

 an acute carina, within which is seen a prominent, vertical, double tooth, of 

 which the outer portion is the larger. A second tooth is carried l)y the inner 

 margin of the peristonre at the centre of the body whoi-l, the point of which is 

 in close reLition to an arcuate tooth carrieil by the juuietal wall of the aper- 

 ture. Umbilicus wide, exhibiting most of the volutions. Height, 7 mm. ; 

 greater diameter, 14 mm. This size is about the average. (Wetherby.) 



Ildix Cupei, WExnr.KKr, Amer. Xat., Mar., 1877, p. 



Twenty mih's north of Beaumont, Harden Co., Texas, 



It is very like a large vultuosa, the aperture not produced bej'ond the teeth 

 as in Ifcnrictfce., but there is no trace of the callus connecting the parietal tooth 

 with the angle of tlie peristome. 



The fiL'ure on Plate I. is a fac-simile of that of Prof. Wetherbv. 



Triodopsis Henriettae, M.vzvck. 



Treated as a var. of T. rnlfiii).-;,!. p. ,313. Peihajis will jirove distinct. 



Slirll riiiialcly uiidijlicatctl, dc])n'ssed, gloliosc, lallier solid, with numerous 

 ivLTular delicate stria', dai'l; lirownish horn-color; spii'e obtuse; whoils about 

 livi' and a half, slightly couvcx ; suture drrply iinjU'csscil ; lieui.-ath couvix. 



