1879.] NATURAL SCIENCES OF PHILADELPHIA. 341 



1861. Pot- (Scytalocr. ) robustus Hall. Descr. New Pal. Crin., p. 7. Bost. Jour. 



Nat. Hist., p. 315. Keokuk liuiest. Subcarb. Crawfordsville, Ind. 

 Sy?i. Poteriocr. Horeyi\Yorthen. Geol. Rep. III., vol. vi. p. 516, pi. 29, fig. fi. 



1843. Pot. (Scytalocr.) rostratus Austin. Ann. and Mag. Nat. Hist., 



vol. x. p. 108; vol. xi. p. 196; Rec. and Foss. Crin., p. 75, pi. 9, figs. 2 a-f. 



Mountain limest. Subcarb. England, Ireland. 

 1879. Pot. (Scytalocr.) Wetherbeyi Miller. Cincinnati Soc. Nat. Hist. (April 



number), p. 6, pi. 8, figs. 1, 1 a, b. Chester limest. Subcarb. Kentucky. 



b. Species with a Compound Brachial. 



1867. Pot. (Scytalocr.) bijugus Trautschold. Bull. Soc. Natur. de Moscou, p. 



14, pi. 4, fig. 1-3. 1879. Kalkbriiche von Mjatschkowa, p. 114, pi. 14, fig. 



3. Upper Subcarb. Moscow, Russia. 

 *1879. Pot. (Scytalocr.) grandis Wachsm. & Spr. Described as Poteriocr. Coreyi 



Worthen, 1875. Geol. Rep. 111., vol. vi. p. 516, pi. 29, figs. 2, 3 (not 



Pot. (Scapkiocr.) Coreyi M. & W. 1869). Keokuk limest. Subcarb. 



Crawfordsville, Ind. 

 *1867. (?)Pot. (Scytalocr.) originarius Trautschold. Bull. Soc. Nat. de Moscou, 



p. 2, pi. 1, fig. 1. Kalkbriiche bei Mjatschkowa, p. 110, pi. 14, fig. 1. 



Upper Subcarb. Near Moscow, Russia. 



We cannot believe that this species possesses only six arms as 

 described by its author, as this would be too great a departure 

 from the arm structure of Crinoids generally. It may possibly 

 have had nine arms, with a single one in the anterior ray, but 

 more probably ten. Thus far but a single specimen has been dis- 

 covered, and in this only the right posterior ray is perfectly 

 visible, which had two arms; the two adjoining rays are partly 

 hidden from view, while the remaining two are entirely imbedded 

 in the matrix. There are traces of but five arms in the slab. We 

 judge from the photograph, PI. 14, fig. 1, that the arrangement of 

 the plates in the calyx has been somewhat disturbed, and this 

 explains the fact that in the diagram, p. 110, the basals (subradials 

 of Trautschold) and radials are incorrectly represented. It may, 

 however, be possible that the original, like a specimen of P. bijugus 

 in our possession, for which we are indebted to the kindness of 

 Prof. Trautschold, is abnormal, and that some of the basals (sub- 

 radials) are anchylosed with the adjoining radials, as in our 

 specimen. Until better material is found we must consider P. 

 originarius as a large and abnormal example of P. bijugus. 



*1879. Pot. (Scytalocr.) urna Trautschold. (Phialocr. urna). Steinbriiche von 

 Mjatschkowa, p. 123, pi. 15, fig. 5. Upper Subcarb. Near Moscow, Russia. 

 (Compare with our remarks on Phialocr hius.) 



1875. Pot. (Scytalocr.) Van Hornei Worthen. Geol. Rep. 111., vol. vi. p. 517, 

 pi. 31, figs. 2, 3. St. Louis limest. Subcarb. St. Louis, Mo. 



