Maiiyland Geolooical Survey 231 



length, consists often of nearly twice as many joints, which are anchylosed 

 together, and usually covered on the exterior by a calcareous secretion 

 of greater or less thickness." Hall, 1859. 



Base of several columns evidently belonging to this species comprise all 

 the writer has seen of this form. 



Occurrence. — Helderberg Formation, Coeymans Member. Devil's 

 Backbone. 



Collection. — U. S. National Museum. 



Lepocrinites manlius Schuchert 



Plate XXXII, Figs. 8, 9 ; Plate XXXV, Figs. 15, 16 



Lepocrinites manlius Schuchert, 1904, Smith. Misc. Col., vol. xlvii, pt. ii, No. 

 1482, pp. 214, 215, pi. xxxvii, figs. 2, 3; pi. xxxix, figs. 15, 16; text fig. 23. 



Description. — Each ambulacrum a little longer than half the length of 

 the theca and bearing on each side about 13 brachioles (or 24 to an ambu- 

 lacrum), of which none is preserved. 



Basal pectinirhomb largest, with about 40 dichopores, while the 2 upper 

 ones each have about 35. 



The conspicuous valvular pyramid of the anus is composed of 6 tri- 

 angular plates surrounded by a circle of about 18 very small pieces. All 

 these parts are deeply set between plates 7, 8, and 13. 



Hydropore small, placed just below the conspicuous madreporite. Both 

 are situated on plate 21, making the abutment on one side for two 

 ambulacra. 



Column unknown. In the cystid layer, however, occur the fused leech- 

 shaped pieces of the column, so characteristic of Lepocrinites. They are 

 smaller than in L. gehhardii and, as they occur in the same zone as the 

 theca of L. manlius, it is probable that these pieces belong to the latter 

 species. 



Compared with L. gehhardii of the Coeymans, L. manlius is considerably 

 smaller, in form more pyriform than subquadrate, has considerably longer 

 ambulacra, and the plate ornamentation is far more decided. 



Occurrence. — -Helderberg Formation, Keyser Member. Keyser, 

 West Virginia. 



Collection. — U. S. National Museum. 



