A MONOGRAPH OF THE EXISTING CRINOIDS 483 



which the lowest are very stout though not especially long. The corresponding pin- 

 nule on the inner arms is about two-thirds of its length, with fewer and smaller seg- 

 ments, and P b is of nearly equal size, while on the outer arms it is considerably smaller 

 than P 2 . 



P 3 is about equal to P 2 , reaching 10 mm. in length, with 20 segments; but on the 

 inner arms it is markedly smaller than P b . In like manner P : on the outer arms 

 reaches 12 mm., with nearly 30 segments, which are less stout than those of P 2 but 

 still of considerable size at the base, while on the inner arms it is small and slender. 

 P s is always quite small. The disk is 17 mm. in diameter and is very deeply incised, 

 almost to the level of the IBr axillaries. Sacculi are abundant along the pinnule 

 ambulacra. In alcohol the disk is gray and the skeleton white more or less mottled 

 with purplish or reddish gray in bands and patches. 



Carpenter said that Antedon conjungens may readily be distinguished by the 

 characters of its lower pinnules, which have more numerous and much shorter seg- 

 ments than those of Antedon tuberculata (Stephanometra spicata) and its allies, while 

 they are not of equal size on all the arms. Except on one postradial series in each 

 specimen there are no IVBr series, so there are normally eight arms to each postradial 

 series. 



On the two outermost of these four arms the first three pinnules are much larger 

 than their fellows on the inner pair. This is especially the case with P 2 , so that while 

 on the inner arms it is about equal to that on the next brachial it is half again as long 

 and considerably stouter on the outer arms. 



Carpenter said that a somewhat similar variation is presented by one of the 

 types that have been distributed by the Godeffroy Museum under the name Antedon 

 protecta Liitken. Thus in one individual, which he owed to the kindness of Prof. 

 Sven Loven, the first two pinnules on the outer pair of every four arms arising from a 

 IIBr axillary are greatly larger than the corresponding pinnules on the inner arms. 

 P 2 has 25 segments and reaches 12 mm. in length, being nearly three times the length 

 of its fellow on the inner arm. In this type, however, according to Carpenter, P 3 

 on both the inner and outer arms alike has little more than a dozen segments and is 

 only some 4 mm. long. The small size of P 3 is remarkable not only as distinguishing 

 the type from conjungens, in which it is at least half the length of P 2 , if not more, 

 but also in the whole group of species with large P 2 . 



Carpenter said that each of the two examples of conjungens has normally eight 

 arms to each postradial series, but a IIIBr axillary is occasionally absent, while in 

 the D ray of each individual IVBr series are developed, one in one and two in the 

 other specimen. 



The specimen from Zamboanga is a beautiful large example of the species one 

 of the finest I have ever seen. It has about 43 arms. It is labeled Comatula 

 polyactinis. 



One of the specimens from Santa Cruz Island, Zamboanga, has 29 arms 95 mm. 

 long, and another has 23 arms 50 mm. long. 



In the specimen from Isabela, Basilan, the centrodorsal is thin discoidal, with 

 the dorsal pole 3 mm. in diameter; the cirrus sockets are arranged in two irregular 

 marginal rows. The cirri are XXIV, 26-29, from 23 to 25 mm. long. The pinnulation 



