FOSSILS OF THE CARBONIFEKOUS. 



247 



- Genus SANGUINOLITES McCoy. 



In the absence of the structure of the hinge-line, the muscular scars, 

 and pallial impression in the following species, there is some uncertainty in 

 referring them to this genus, as in their general external appearance they 

 resemble more or less forms referred to the Modiomorphidse. 



Sanuiuolites JEdlua H. & W. 



Plate xx, figs. 6, 7, 9. 



Sanguinolites ceolus Hall, 1870. Prelim. Notice Lam. Shells, p. 46. 



? ceolus Meek, 1875. Pal. Ohio, vol. ii, p. 307, pi. xvi, figs. 1 a-c. 

 ^olus Hall, 1883. Pal. N. Y., vol. v, pt. 1, Plates and Explanations, 

 pi. Ixvi, fi^s. 31-35, 43. 



The specimen illustrated by fig. 6 is a typical form of this species, cor- 

 responding to those from the Waverly sandstone of Ohio, and we cannot 

 distinguish the shorter, broader shells, as shown by figs. 7 and 9, as a dis- 

 tinct species, as there is a complete gradation of form between them, and 

 to even a still broader variety that is designated in the systematic list as 

 S. JEolus, var. A small shell of this species from the same locality resembles 

 very closely some examples of Sanguinolites rigidus, an illustration of which 

 is given from the Devonian .limestone on plate xvi, fig. 6. 



Formation and locality. Lower portion of the Carboniferous Group on 

 the east slope of a small conical hill on the east side of Secret-canon-road 

 Canon, Eureka District, Nevada 



Sanguinolites retusus, n. sp. 

 Plate xx, fig. 10. 



Shell broad, irregularly ovate; moderately convex; beaks anterior, 

 small and compressed; umbonal slope distinctly angular and extending 

 from the beaks to the postero-basal angle, the somewhat rapidly sloping 

 postero-cardinal slope being marked midway by a slight longitudinal ridge. 

 Cardinal line short and a little arcuate; basal line broadly rounded, uniting 

 posteriorly with the slightly rounded, oblique posterior line to form a 



