REPORT ON THE CRINOIDEA. 83 



Eadials partially visible. First brachials nearly oblong, widening slightly and then 

 narrowing a little. Second brachials quadrate, and appearing in a side view of the 

 specimen to project strongly backward into the first brachials, as the surfaces of both 

 joints rise towards the middle of their line of junction. The following joints have 

 unequal sides, the fourth having a syzygy and bearing a pinnule on the shorter side, 

 usually the right. The seventh joint is more oblong, while the eighth and following 

 brachials become more distinctly unequal-sided, the breadth being about equal to the 

 length of the longer side which bears the pinnule. Further out on the arms the length 

 gradually increases in proportion to the breadth, and the joints become more and more 

 cylindrical. Second syzygy from the seventh to ninth brachial ; and the later syzygial 

 intervals vary from one to four joints. 



The lower pinnules are all about equal in length, and consist of some twenty joints. 

 Except in the first four or five pinnules all but the lowest joints are twice as long as 

 broad, or slightly longer, and more transparent and glassy than the cirrus-joints. 

 Ovaries short, not extending over more than three or four joints. Towards the arm 

 ends the pinnules gradually decrease both in length and in the number of joints. 



Mouth central. Disk and arm-bases rather closely plated, but the brachial ambulacra 

 merely have irregular rods and networks of limestone at their sides. They lie close 

 down between the muscles and show no traces of sacculi. Skeleton white. 



Disk 5 mm. in diameter. Radial pentagon 4 mm. Spread probably about 150 mm. 



Localities.— Station 164, June, 12, 1874; lat. 34° 8' S., long. 152° 0' E.; 950 

 fathoms ; green mud ; bottom temperature, 36°"5 F. One specimen. 



Station 169, July 10, 1874; lat. 37° 34' S., long. 179° 22' E.; 700 fathoms; blue 

 mud ; bottom temperature, 40°'0 F. Two specimens. 



Remarks. — I have named this species after Professor C. Semper of Wiirzburg, to 

 whom we owe the discovery during his residence in the Philippine Islands of the type 

 species of Eudiocrinus {Eudiocrinus indivisus). The absence of pinnules on the second 

 and third brachials distinguishes Eudiocrinus semperi both from the type and also from 

 Eudiocrinus varians. Furthermore, both these species have sacculi, which are abundant 

 in Eudiocrinus indivisus, but rare in Eudiocrinus varians ; while I have not been able to 

 find them even on the pinnules, either of Eudiocrinus semperi, or of the closely allied 

 Eudiocrinus japonicus, though they are abundant in the Atlantic species. 



Eudiocrinus semperi, like other Coinatulse, exhibits a certain amount of local variation. 

 All three specimens were obtained in a very mutilated condition, hardly anything 

 remaining of one of them but the calyx and the bases of the arms. But sufficient 

 remains of the other two to indicate a considerable amount of flexibility in some of their 

 characters. That from the lesser depth (Station 169) is the larger of the two, and its 

 disk bears larger and more numerous plates ; while there are fewer cirri on the centro- 



