white. I ANNOTATED CATALOGUE. 63 



was described by Meek from the Bear River Laramie beds of South- 

 western Wyoming, under the name of C. macrospira.* It is illustrated 

 on Plate 8. 



Meek & Hayden obtained from the Judith River Laramie beds of the 

 Upper Missouri River region a species to which they gave the name of 

 Campeloma vetula;] and examples of the same species have also been 

 recognized in the Laramie strata at Black Buttes Station, in Southern 

 Wyoming. It is illustrated on Plate 27. 



Two other species of Campeloma, namely, ft multistriata and ft multi- 

 lineata Meek & Hayden, were originally described from the Laramie 

 strata near Fort Clarke, in the valley of the Upper Missouri.^ Both 

 forms are represented on Plate 27. The former has also been somewhat 

 doubtfully recognized at Black Buttes Station, in Southern Wyoming, 

 and the latter iu the valley of Crow Creek, east of the Rocky Mountains, 

 in Colorado. 



Among a collection of Laramie fossils made several years ago in the 

 valley of the Yellowstone River by Mr. J. A. Allen are some examples of 

 Campeloma multistriata that show the species to be much more variable 

 than was indicated by the description and figures given by Meek & 

 Hayden. Some of these have the typical form and characteristics as 

 described by them, but others are strongly shouldered at the distal side 

 of the two last volutions. Examples of these are given ou Plate 27. 



Associated with the foregoing are numerous examples of a very varia- 

 ble species, some of which examples have the characteristics of Campelo- 

 ma, except that they are more than usually elongate, and some of them 

 appear to have the characteristics of Lioplai; Troschel. The species rep- 

 resented *by these specimens appears to have never been described, 

 and I therefore apply to it the name of Campeloma (Lioplax ?) producta, 

 indicating the form represented by figures 21 and 22 on Plate 20, as the 

 type. Figures of the associated forms, and which perhaps belong to 

 the same species, are also given on the same plate. 



Shell, elongate- ovate ; test, moderately thick ; spire, more than usually 

 produced for a species of this genus ; volutious, six or seven, usually 

 slightly flattened, or having a faint revolving depression urjon the dis- 

 tal side near the suture, which is more apparent upon the larger than 

 the smaller volutions; suture, deep and abrupt upon the proximal side; 

 aperture and lips having the usual characteristics of Campeloma or 

 Lioplax ; surface, marked by the usual lines of growth, and by somewhat 

 numerous revolving striae which are often obscure, but upou the smaller 

 volutious of some of the examples a few of the striae are so strong as to 

 produce a faint angularity. Among these examples are others which 

 possess the general characteristics of those which are regarded as the 



*See An. Rep. U. S. Geo], Sur. Terr, for 1878, Part I, p. 102, pi. 30, fig. 2. 



t U. S. Geol. Sur. Terr. vol. ix, p. 587, pi. 42, fig. 14. 



\ U. S. Geol. Sur. Terr., vol. ix, pp. 586 and 588, pis. 43, fig. 15, and 44, fig 



