200 PROCEEDT^QQ OF TJlE NATIONAL MU8EVM. vol.41. 



with another Lower Burhngton species, B. cornutus. Such pecuhar 

 sculpturing has not been found on any Barycrinus later than the 

 Lower Burlington, and as shown in these specimens it is doubtless 

 a strong exaggeration of that of B. rhombiferus , as described, and usu- 

 ally labeled in collections; this form is beautifully ornamented with 

 fine wrinldes, from which the above more striking characters were 

 perhaps derived, and it has also decidedly shallower and wider radial 

 facets. As the form now described can be recognized without the 

 least doubt, either by the calyx or a single radial, I have thought best 

 to designate it at once as a new species, Barycrinus asperrimus. 



Locality. — As above stated at Whites Creek. It was not found at 

 the Knobs, but I have plates belonging to it from the equivalent beds 

 at Lake Valley, New Mexico. 



2. A species with long, horn-like, irregular, projecting nodes on 

 radials and basals, readily identifiable as B. cornutus Owen and Shu- 

 mard, of the Lower Burlington Limestone. Barycrim with stellate 

 base, i. e., with a broad, projecting ridge from infrabasals to basals. 

 giving a star-like effect, are found throughout the Burlington and 

 Keokuk, and several species have been described upon slight modifi- 

 cations of detail in this. In this species the projections on basals and 

 radials are confined to the plates on which they originate, and are 

 often peculiarly contorted nodes, pulled out to all kinds of irregular 

 ends, like a piece of clay when pulled in two. The surface is other- 

 wise smooth. The axillary brachials, where the ramules are given off 

 from the main arms, are produced into spines, which become long and 

 slender toward the distal end of the arms. 



Locality. — Calyx plates with the nodes above described, and spinif- 

 erous axillary brachials, some with spines half an inch long, are 

 found at Button-mould and neighboring knobs in Kentucky; at 

 Stone's farm, Indiana; Fern Glen, Missouri; and at Lake Valley, 

 New Mexico. Also a completely typical calyx at Whites Creek, 

 Tennessee; this has a radianal, as occasionally occurs in this genus, 

 and the Burlington specimens of this species have either an unusually 

 large anal plate for the genus, or two, with RA sometimes showing 

 only at the interior. 



. 3. A less rugose and smaller protuberance on BB and RR, more 

 distinctly rounded or spiny, gives a form closely related to the last, 

 described by Hall as B. stellatus, from the Iowa Keokuk. It is a 

 rather smaU species, quite abundant at Indian Creek, Indiana, and 

 it has also spiniferous axillary brachials. Both have very wide, 

 shallow radial facets, directed obliquely upward. The two forms are 

 closely related, and doubtless shade into one another; but while the 

 typical cornutus has not been found above the Lower Burlington 

 the present one is represented there as well as in the Keokuk. 



