1898-1902. No. 13.] ECHINODERMATA. 



Havne Fjord. 



Arm-radius 48 mm. 



Disc-radius 15 jj^^f, 



Breadth of arm at base 18 mm. 



r : R 1 : 3.2 



Number of ventro-marginal paxillse . . . 19—20 



Number of inner ambulacral papillae . . 3—4 



Number of outer ambulacral papillee . . 3-5 



The diameter of the Gaase Fjord specimen (PI. 3, fig. 1) is 134 mm. 

 It greatly resembles the specimen from Discovery Bay, described by Duncan 

 & Sladen (16, p. 45). Like it, the Gaase Fjord specimen is remarkable 

 for its comparatively broad disc, broadly rounded angles between the 

 arms, and very pointed arms. Its arms are not so long, however, as 

 its arm-radius is only twice that of the disc, whereas in the specimen 

 from Discovery Bay, the proportion of r to R is as 1 : 2.73. In the 

 second of the Fram Expedition specimens, r : R as 1 : 3.2. For the sake 

 of comparison it may be stated that in a specimen from Spitzbergen, 

 139 mm. in diameter, r : R = 1 : 2.6. In specimens from the arctic 

 regions of the North Atlantic, I have moreover found that the propor- 

 tion may vary betwen 1:2.2 and 1:3.3; in young specimens it may 

 even be 1 : 3.6 (Michailovskij, 27, p. 168). In specimens from the west 

 coast of Norway, I have found that the proportion r : R varies between 

 1 : 2.4 and 1 : 3.7. 



Another feature of the Gaase Fjord specimen is that the abactinal 

 surface is covered with very large paxillse, 3 mm. in width, which are 

 furnished with from 20 to 30 wart-Hke spines — spinelets (PI. 1, fig. 3). 

 Towards the ends of the rays, the paxillse become rapidly smaller, the 

 number of spines at the same time also decreasing, so that the paxillse 

 at the extreme end have only from 3 to 6 spines. The innermost 

 ventro-marginal paxillse aie 4 mm. in width, and may have more than 

 40 spines. The largest inter-radial paxillse have 8 or 9 spines. In the 

 above-mentioned large specimen from Spitzbergen, the abactinal paxillse 

 are only 2 mm. wide, and have up to 24 spines. The innermost ventro- 

 marginal paxillse may be as much as 3 mm. in width, and have up to 

 40 spines. The largest inter-radial paxillse have from 6 to 8. 



In l^the Solaster furcifer specimen taken by the Fram Expedition 

 in Havne Fjord, the abactinal skeleton consists of irregular stellate calca- 

 reous bodies (PI. 1, fig. 4) resembling those found in the Solaster furcifer 

 living in the cold area of the North Atlantic. In the Havne Fjord 



