A MONOGRAPH OF THE EXISTING CRINOIDS 475 



The specimen from station 37 has about 120 arms IGO mm. long. There are 

 10 IIBr 4 (3 + 4) series. Tiie IIIBr series are 2 exteriorly and 4 (3 + 4) interiorly on 

 all the postradial series. 



The specimen from station 43 is verj^ young with 34 arms about GO mm. long. 

 Of the 10 IIBr series 5 are 4 (3 + 4) and 5 are 2. The IIIBr series are 2 exteriorly and 

 4 (3 + 4) interiorly on all the postradial series. The interradial perisomic areas are 

 completely and heavily plated. The cirri are XII, 13-14, about 10 mm. long. 



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

 Amboina has about 100 arms. One of the postradial series has the 2 IIBr series 2 

 and all 4 IIIBr series 4 (3 + 4). On the other 4 postradial series the IIBr series are 

 4 (3 + 4); on 3 of these the IIIBr series are 2 exteriorly and 4 (3 + 4) interiorly; on 

 the fourth 1 of the exterior IIIBr series is 4 (3 + 4), the other being 2. The cirri are 

 V, 16-17, from 13 to 15 mm. long. Another specimen is small, though well developed, 

 with about 80 arms 130 mm. long. The 10 IIBr series are 4 (3 + 4). On 4 of the 

 postradial series the IIIBr series are 2 exteriorly and 4 (3 + 4) interiorly. On the 

 fifth postradial series one of the exterior IIIBr series is 2, the other 3 IIIBr series 

 being 4 (3 + 4). A third specimen is similar to the first, but has only II cirri. 



Dr. Clemens Hartlaub recorded (as regalis) 17 specimens from Amboina wliich 

 he thus described: 



The centrodorsal is approximately circular or pentagonal, usually flat, some- 

 times scarcely rising above the surface of the radial pentagon. The cirri are marginal. 



The cirri are VI-XX, about 17. The fifth, sLxth, and seventh segments are the 

 longest. The segments are as a rule smooth, but the outermost may bear slight 

 spines. The opposing spine is small or entirely lacking. The distal end of the cirri 

 is commonly thicker than the proximal. 



The radials are visible. The IBri are trapezoidal. The IBra (axUlaries) are 

 broadly triangular. The rays may divide six times, but the rule is five times. The 

 IIBr series are 4 (3 + 4). The 2 first elements of the IIBr series on adjacent raj's are 

 sometimes in close contact, but often separated by a broad interradial plating. This 

 may even reach downward to the centrodorsal, separating the outer halves of 2 

 adjacent radials. A similar, but narrower, plating is usually found between the 

 2 IIBr series on each ray, uniting their 2 distal elements, and sometimes also between 

 the first elements of the inner IIIBr series. The 2 branches arising from each 

 a.xillary diverge only very slightly so that the first and often also the second ossicles 

 of adjacent division series are in contact. The IIIBr series are as a rule 2 externally 

 and 4 (3 + 4) internally. All the following division series are 4 (3 + 4). 



There are usually more than 1 00 arms, and at least 70. The anterior arms are 

 long, up to 1 60 mm. in length, and taper slowly. The posterior arms are much shorter 

 and taper rapidly. The brachials are moderately short, and those in the proximal 

 half of the arms have strongly produced distal ends. The first brachials are usually 

 closely united interiorly. After about the sixth the brachials become triangular and 

 strongly overlapping, then fairly soon short wedge-shaped and finally more oblong. 



The first brachial syzygy is between brachials 3 + 4, and the second from be- 

 tween brachials 6 + 7 to between brachials 18 + 19, usually from between brachials 



