CRINOIDS AND BLASTOIDS. 199 



TAXOCHIXT s IXTERMEDIUS (nov. sp.) W. & Sp. 



PL XV. Fig. 11. A fine specimen with arms and stem. 



A transition form between Onychocrinus and Taxocrinux, but 

 apparently nearer the latter: larger than the preceding species; 

 in its usual condition, with the arms bent inward, wider than 

 hi.irh. The rays widely divergent: the arms so long that their 

 incurved tips hang down to the top of the primary radials. 

 Color of specimens comparatively light; the plates devoid of 

 ornamentation. 



['nderbasals three, unequal; the smaller one placed in a ver- 

 tical line with the right postero-lateral radial: almost completely 

 covered by the column, there being only a small rim exposed 

 laterally. 



Basals large, subequal in size; regularly pentagonal: forming 

 a shallow cup. with five salient and five reentering angles. 



Radials four in four of the rays, five in the right postero- 

 lateral one (constant in both specimens); wide but compara- 

 tively short for the genus, about three times as wide as 

 high, the upper and lower plates somewhat wider and pro- 

 portionately higher; the axillary one with obtuse upper angles. 

 Secondary radials three, a little more than half the width of 

 Thf preceding plates: the lower ones laterally connected in the 

 same ray. but not with their fellows of adjoining rays: the 

 second separated by three interaxillaries; the third free, widely 

 apart. Third order of radials variously composed of from 3 to 

 5 plates, of similar proportions to those of the preceding 

 orders, with one or three small interbrachials between the second 

 plates: the succeeding radials free. There are apparently three 

 more divisions above, the proximal plates above each bifurca- 

 tion connected laterally, the upper ones free. 



All articular lines between the radials of the first and second 

 orders undulating, owing to the presence of short but wide 

 patelloid pieces: the lines between the succeeding plates straight, 

 the patelloid pieces either being absent or very minute. 



The interradial plates can be traced in both specimens to the 

 ventral side: they are very interesting as throwing light upon 

 the ventral covering of the Ichthyocrinidae generally. In four of 

 the interradii, interposed between the primary radials, there are 

 five to seven comparatively large, slightly convex plates vari- 



