BATOCRINID2. 439 
Lobocrinus spiniferus W. and Sp. (nov. spec.). 
Plate XXX. Figs. 11 and 12. 
Of the type of L. Nashville, but a smaller species. Dorsal cup generally 
a little wider than high ; from the top of the basals gradually expanding to 
the arm bases; sides concave. Plates very slightly convex, the radials sur- 
mounted by a small central node. 
Basal cup twice as wide as high, narrower at the upper end, the inter- 
basal sutures grooved, imparting to the base, as seen from the bottom, a 
trilobate outline. Radials longer than both costals together, and also broader. 
The first costals about once and a half as wide as long; the second wider 
above than below. Distichals two, of the same proportions as the two costals ; 
followed by a single range of palmars, which are larger than any of the pre- 
ceding brachials, and support the free arms. Arm facets directed obliquely 
upwards. Arms arranged in pairs; those of different rays separated at their 
bases by one or two interbrachials, those between their main divisions by a 
o, and curv- 
single interdistichal. Arms short, cylindrical, very little tapering, 
ing inward ; they are composed of two rows of transverse pieces, alternately 
arranged and slightly interlocking. Pinnules very long, in close contact ; 
composed of elongate flat joints. Interbrachials: 1, 2, 2, 1; the first larger 
than any two of the others, the upper placed at the arm regions. Anal plate 
somewhat taller but narrower than the radials; followed by 3, 3, 2, and 2 
plates. The construction of the disk not visible in any of the specimens. 
Anal tube long, observed to an inch above the tips of the arms, but evi- 
dently longer. It is composed of convex, slightly nodose plates, but at a 
height nearly corresponding to the tips of the arms there are from seven to 
eight plates with sharp, slender spines, 5 to 6 mm. long, which stand out 
horizontally from the sides. 
Horizon and Locality. — Keokuk group; Indian creek, Montgomery 
Co., Ind. | 
Types in the collection of Wachsmuth and Springer. 
Remarks. — There is a slight possibility that Batocrinus marinus Miller and 
Gurley is identical with this species. We were unable to make satisfactory 
comparison either with the description or figure. 
