BATOCEINID^. 439 



Lobocrinus spiniferus W. and Sp. (nov. spec). 

 Plate XXX. Figs. 11 and 12. 



Of the type of L. Nashvillce, 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. Eadials 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 

 iipwards. Arms arranged in pairs ; those of different rays separated at their 

 bases by one or two interbrachials, those between their main divisions by a 

 single interdistichal. Arms short, cylindrical, very little tapering, and curv- 

 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, 8, 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, 6 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. 



RemarJcs. — There is a slight possibility that Batocriniis marinus Miller and 

 Gurley is identical with this species. We were unable to make satisfactory 

 comparison either with the description or figure. 



