196 



before collected, so that we have probably a pretty full re- 

 presentation of the fauna of that locality. 



Among these collections, I have determined the following 

 species heretofore undescribed. 



CRINOIDE^E. 

 GENUS ACTINOCRINUS (Miller.) 



■y ACTINOCRINUS CHRISTYI (n. S.) 



Body below the arms elongate urnshaped, or subovate, 

 very slightly spreading at the arm bases. Basal plates 

 proportionally small, more abruptly spreading than the 

 succeeding plates, their lower margins somewhat pro- 

 duced near their junction with the column. First radial 

 plates of moderate size, height and width equal, those of 

 the postero-lateral rays smaller. Second radial plates 

 hexagonal, somewhat wider than high. Third radials, 

 heptagonal, higher than wide, smaller than the second, 

 supporting a pair of supra radials, on each upper sloping 

 side, one above the other, the upper one a bifurcating 

 plate, and supporting a series of brachial plates on each 

 upper side, giving four arms to each ray, as far as deter- 

 mined. Interradial plates numerous, the first one hexa- 

 gonal, size intermediate between the first and second 

 radials, supporting two in the second and third ranges; 

 about five other ranges above, of two or three plates 

 each, gradually decreasing in size toward the summit. 

 First anal plate heptagonal, in size equal to the largest 

 first radial, but shorter, and supporting three smaller 

 plates in the second range with a large number of smaller 

 plates above. Inter-supraradial spaces occupied by from 

 five to seven plates each, gradually decreasing in size 

 from below upwards. The plates of the radial series 

 are marked along their centres by an elevated ridge, 

 which is interrupted at the suture of the first, second and 

 third radials, but becomes more distinct in the supra radial 



