A MONOGRAPH OF THE EXISTING CRINOIDS 243 



New Guinea, in the Leyden Museum in having a larger number of cirri and a different 

 coloration. The type specimen has only XII cirri and a white ground color with 

 dark red-brown bands on tlie arms. The general color of the specimens from Tonga 

 is, on the contrary, very dark because the deeply colored bands and spots on the 

 brachials balance the lighter brown ground color. The specimens from Tonga are 

 larger, as the arms of the type specimen are only 30 mm. long. 



I examined 7 of these specimens at the Hamburg Museum in 1910. In one of 

 them the cu-ri are XXIII, 21, the segments terminally becoming nearly as long as 

 broad. The centrodorsal is thin discoidal, with the cirrus sockets, which are oblong 

 and from two and one-half to tlu-ee times as high as broad, arranged in a single regular 

 marginal row; the dorsal pole is slightly concave, 3 mm. in diameter. Pj is 7 mm. long 

 with 15 segments of which the fifth is the longest, twice as long as broad, there is a 

 very slight spinous production of the distal ends of the segments. 



Another specimen has also 21 cirrus segments which distally are nearly as long as 

 broad. Pj has 15-18 segments of which the basal are flattened exteriorly; the distal 

 edges of the third and following segments are slightly produced and spinous. 



In a third specimen the arms are about 60 mm. long. The cirri are 15 mm. 

 long with 20 or 21 segments. P, has 10-13 segments. Pj has 12 segments which have 

 no perceptible production of the distal edges. 



A fourth specimen is interestmg in possessing 1 1 arms, one IIBr series consisting 

 of a smgle axillary ossicle being present. P, has 16 segments. 



The three remaining specimens are similar to those described. 



I wrote that these specimens possess in general the characters of the form from 

 southeastern Africa, which I called occidenialis, and possibly should be recorded under 

 that name. They have but the merest trace of the character from which serripinna 

 gets its name, though this is not entirely absent. 



In a specmien from Tonga in the Copenhagen Museum (labeled by Lutken 

 Antedon cupuliferus) P^ is practically smooth— there are no easily visible spines on 

 the distal ends of the segments. 



Abnormal specimen. —One. of the specimens from the Tonga Islands in the Ham- 

 burg Museum has 1 1 arms, a single IIBr series consisting of a single axillary ossicle 

 being present. 



LocalUies.—'New Caledonia; M. Vigu^, 1875 [A. H. Clark, 1911, 1912 1913 

 1918] (1, P. M.). 



Tonga Islands, from the Godeffroy Museum collection [Hartlaub, 1891; A H 

 Clark, 1912] (7, H. M.). 



Tonga Islands, from the Godeffroy Museum collection (1, C. M.). 



No locahty, Prof. J. Bccte Jukes; H. M. S. Fly, 1843-1847 [A. H. Clark, 1913] 

 (1, B. M.). 



Geographical range. — From New Caledonia to the Tonga Islands. 



Bathymetrical range. — Littoral. 



History. — Under the name Aviedon serripinna Dr. Clemens Hartlaub in 1891 

 described in detail 9 specimens from the Tonga Islands which he had found in the 

 Hamburg Museum bearing Liitken's manuscript name Antedon cupulijera. They 

 had originally been a part of the collection of the Godeffroy Museum. He gave a 

 figure of the central portion of one of the specimens viewed dorsally, and compared 



