A MONOGRAPH OF THE EXISTING CRINOIDS 537 



the broad basal ones being especially stout. These lower pinnules, and in fact the 

 arms as a whole, are much more clothed with perisome than are those of the type 

 specimen at Leyden. 



The mouth is interradial. 



I found this specunen to be a magnificent example of the species, resombUng the 

 one from the Pelew Islands in the Copenhagen Museum. 



The specimen from Siboga station 299 is a beautiful and typical e.xample, with 

 about 120 arms which are 180 mm. long. The cirri are about XL, 26-28, from 35 

 to 40 mm. in length, and are typically stout and smooth. All of the arms are grooved. 



Goldfuss's figure of a specimen from the Indian Ocean (probably the Dutch 

 East Indies) shows only a single IIBr series with all the succeeding division series. 

 As this bears 8 arms, the total number of arms must have been about 80. The ends 

 of the basal rays are visible as small tubercles, with above them a gablelike structure 

 formed of the everted and thickened adjacent lateral borders of the radials. All of 

 the division series are 4 (3 + 4). A single fully developed cirrus is shown which has 

 25 subequal segments, the distal without dorsal processes. 



The specimen from Siboga station 240 is similar to that from Siboga station 299. 

 It has about 80 arms which are about 180 mm. long. The cirri are XXI, 27-32, from 

 35 to 45 mm. in length. One of the IIIBr series is 1 and two are 2. All of the other 

 division series are 4 (3 + 4). 



One of the specimens collected at Banda by the Danish expedition to the Kei 

 Islands has 74 arms 150 mm. long. All the division series are 4 (3 + 4). The 

 centrodorsal is 8 mm. in diameter and has the dorsal pole strongly concave. The 

 cirri are XXVII, 26-28, up to 40 mm. in length. The other specimen has 72 arms 

 140 mm. long. All the division series are 4 (3 + 4). The cirri are XXVI, 26-29, up 

 to 35 mm. in length. 



Hartlaub said that one of the 4 specimens collected by Brock at Amboina showed 

 the characters of peroni. The cirri, which are arranged in 2 rows on the centrodorsal, 

 are XXV, 28. The second syzygy on some arms is between brachials 14 + 15 or 15 + 16 

 and on others between brachials 19 + 20 or 20 + 21. The diameter of the disk is 

 21 mm. This specimen is smaller than the others and of more slender build. 



The 3 other specimens agree in their characters. The cirri are XXX-XL , 

 27-30, the longest about 40 mm. in length. Some of the cirri are slender and com- 

 pressed and others are stout. In respect to their cirri these specimens are intermediate 

 between peroni and bennetti. 



As described by Professor Koehler, the specimen collected by Bedot and Pictet 

 at the Bay of Amboina lacks a part of the disk as well as the arms on an entire side of 

 the body. The other arms are broken toward the tip, so that it is impossible to esti- 

 mate their length. 



The dorsal pole of the centrodorsal is strongly concave. The cirri are arranged 

 in 3 rows. 



The cirri are XXXVIII, 26-28, and are composed of segments wliich are as long 

 as broad and are without dorsal processes. 

 97298—31 35 



