82 SUBGARBONIFEROUS PERIOD. 



imbedded in the limestone, and partly defaced by weathering. One of these 

 is a Platycrinus, as shown by characters other than the body-plates, the 

 exact outlines of which are obscured by the injury the specimen has suf- 

 fered. The outline of the calyx is shown, however, being broad cup- 

 shaped, the base slightly depressed at the middle ; arms bifurcating two or 

 three times ; branches of arms slender ; the whole upper part of the body 

 prolonged into a proboscidiform dome, which has a height equal to about 

 three times that of the calyx, and stands erect between the arms ; stem 

 slender, composed of joints of unequal size. 



Breadth of the calyx about eight millimeters ; height, five millimeters ; 

 height from base of the calyx to the top of the proboscidiform dome, two 

 centimeters ; the ai'ms were capable of being extended nearly a centimeter 

 farther. The apparent breadth of the calyx has possibly been increased a 

 little by pressvu-e ; but the general proportions have evidently not been 

 mvich changed. 



This species is a delicate one in all its parts. Except that it is not 

 nearly so rubust, nor so large, it resembles P. Icevis Miller, as figured by de 

 Koninck and le Hon (Recher. Crinoides du Ten*. Carb. de la Belgique). 

 Judging from the general features of the fossil and such details as its con- 

 dition allows of being observed, it seems to belong to an undescribed 

 species, but of this I am not entirely satisfied. In case the discovery of 

 more perfect specimens should show the species to be new, I propose for it 

 the name of P. vexahilis. 



Position and locality. — Strata of the Subcarboniferous period ; Mountain 

 Spring-, old Monnon road, Nevada. 



Family ACTINOCRINID^. 



Genus ACTINOGRINUS Miller, 1821. 



Actinocrinus viaticus White. 



Plate V, fig. 1. 



Actinocrinus viaticus Wbite, 1874, Expl. & Surv. west 100th Merid., Prelim. Rep. 

 Invert. Foss., IG. 



Body below the amis broadly turbinate ; anns slender, somewhat flat- 

 tened laterally, apparently numbering thirty in all, the two full i-ays and 



