148 COLORADO FORMATION AND ITS INVERTEBRATE FAUNA, [bull. 106. 



wing to the opposite side, 9 n,m ; spire, falciform process, and anterior 

 canal each about 7 niin ." 



In the type specimen the wing is very thick and bordered externally 

 by a raised rim and the anterior canal is somewhat curved inward. In 

 these features, as well as the thick callus enveloping the spire, it resem- 

 bles Pugnellus. 



The types of Lispodesthes lingulifera were obtained at another locality 

 though apparently from about the same horizon as the one above de- 

 scribed. They are smaller specimens with thinner shells and wings of 

 slightly different shape, but these differences are only such as might 

 be seen at various stages in the growth of a single individual and are 

 therefore not regarded as of specific importance. The author of the 

 species concurs in this opinion. 



It has already been shown in the note on the genus Lispodesthes that 

 this typical species is not closely related to such forms as Aporrhais 

 parMnsoni, A. schlotheimij etc., that have been referred to this genus by 

 Zittel and Holzapfel. The only species known to me that seems to be 

 congeneric with this one is Anchuraf neivberryi Meek l . The descrip- 

 tion and figure of this species, given by Whitfield in the Geology of the 

 Black hills of Dakota, show that it belongs to the same section with 

 L. nuptialis. 



Locality and position. — Fifty miles north of Camp Apache, 5 miles 

 west of Mineral Springs, Arizona ; east of Mount Taylor, 1 mile south 

 of Pajuate, New Mexico. At the former locality it is associated with 

 Camptonectes platessa and at the latter with Pinna petrina, both of which 

 occur elsewhere in the Colorado formation. 



Genus PUGNELLUS Conrad. 



Pugnellus fusiformis Meek (sp.). 

 PI. xxxi, Figs. 7-11. 



Anchuraf fusiformis Meek, 1877, U. S. Geol. Expl. 40th Parallel, vol. IV, Pt. 1, p. 160, PI. 



15, Figs 2 and 2a. 

 Not Anchuraf fusiformis (Meek) White, U. S. Geog. & Geol. Sur. West 100th Meridian, 



vol. iv, p. 190, PI. 18, Fig. 4a. 

 Lispodesthesf olscurata White, 1880, Ann. Kept. U. S. Geol. Sur. Terr, for 1878, p. 30, PL 



11, Figs, la and b. 



Shell, exclusive of the outer lip, fusiform, consisting of six or seven 

 volutions, of which the last forms about five-sixths of the total length ; 

 the whorls of the spire are sometimes subangular above the middle, and 

 the body-whorl is ventricose in the same region ; suture distinct in 

 young shells, but almost entirely covered in the adult by a very heavy 

 spiral callus, which extends backward from the inner lip over the 



i Macomb's Exped. from Santa F6 to junction of Grand and Green rivers, p. 129. 



