LECANOCRINIDAE 163 



Anisocrinus angelini Wachsmuth and Springer 

 Plate X, figs. 4a, b 



Lecanocrinus macropctalus Angelin, Icon. Crin. Suec, 1878, p. 12, pi. 19, fig. 4, not pi. 19, fig. 3, nor 



pi. 22, fig. 24. 



Anisocrinus angelini Wachsmuth and Springer, Revision Palaeocrinoidea, pt. 1, 1879, p. 37. — Springer, 



Jour. Geology, XIV, 1906, p. 480, pi. 6, fig. 10. 



A very small species. Crown ovoid, rounded below, contracting above the 

 calyx ; base broadly rounded, perhaps shallowly concave ; greatest width at RR, 

 where height to width is i to 1.8. Surface smooth. Crown, 7 mm. high by 5.5 

 mm. wide. 



IBB very small, not visible in side view, perhaps covered by the column. 

 BB larger than RR. RA quadrangular, lying obliquely to left of r. post. R. 

 Height of B to R to IBr, 3:2.2:1.4. IBr about half as high as wide. All 

 brachials proportionally longer and narrower than in other species. Column 

 composed near the calyx of large rounded columnals, with short and narrower 

 ones interposed. 



There is only one specimen certainly referable to this species ; it is a very small one with 

 the characters of immaturity, and it may be only a variant young specimen of A. interradiatus. 

 For some strange reason Angelin figured under the name Lecanocrinus macropetalus two 

 specimens for which Wachsmuth and Springer proposed the present species. But a careful 

 examination of these specimens shows that they are not at all alike, and if the species is to be 

 maintained it must be upon the smaller specimen — Icon. Crin. Suec, plate 19, figure 4. 

 Angelin's figures of them are all misleading; his plate 19, figure 4 is about four times 

 enlarged ; plate 19, figure 3 and plate 22, figure 24, both drawn from one specimen, are partly 

 restored and incorrect, and the specimen may belong to a different generic type. I have re- 

 figured plate 19 figure 4 with two correct drawings, enlarged three times (PI. X, figs. 4a, b, 

 herein). The proportionally longer brachials indicate an immature stage, but the shape and 

 position of the radianal, contour of the lower part of the calyx, very small infrabasals, large 

 basals, and two secundibrachs, afford recognizable differences from the other species. 



Type. In the Riks Museum, Stockholm. 



Horizon and locality. Silurian, Wenlock Group, horizon /; Gotland, Sweden. 



Anisocrinus greenei (Miller and Gurley) 

 Plate X, figs. 8, 9 



Lecanocrinus greenei Miller and Gurley, Bull. 8, Illinois St. Museum, 1896, p. 52, pi. 3, fig. 28. — Miller, 



N. A. Geology and Palaeontology, 2d Appendix, 1897, p. 748, fig. 1363. 

 Anisocrinus greenei, Springer, Jour. Geology, XIV, 1906, p. 480, pi. 6, fig. 11. 



A rather large species. Crown elongate ovoid, conical below gradually ex- 

 panding with nearly straight sides to level of RR, where height to width is i to 

 1.5; thence cylindrical, and broadly truncate at the top; spread of calyx from 

 base to RR, i to 3 ; base truncate. Surface smooth. Crown, 19 mm. high by 

 12 mm. wide. 



IBB large, erect, and about continuous with the column, not forming a rim. 

 BB large, RR smaller; height of B to R to IBr, 5:4:2. IBr short, about one- 



