BERMUDA ECHINODERMS. 127 



meter, though the number per square centimeter would of 

 course be greatly increased by increased contraction of the body 

 wall. There are twelve tentacles, each with from 15—19 digits, 

 and on the inner side of each near the base are numerous 

 1(25—30 or more) " sense-cups " similar to but somewhat smaller 

 than those found in inhcErens. There is no trace of eye spots. 

 The genital papilla is in the mid-dorsal line just outside of the 

 tentacles and in one specimen is very prominent, half a milli- 

 meter long. The reproductive organs are only slightly de- 

 veloped in these specimens, the branches being only 10 mm. 

 long. The latter are very slender and lie on both sides of the 

 dorsal mesentery. The stone-canal is small and single and lies 

 in the mesentery. The Polian vesicles are fairly numerous, two 

 long ones (8 mm.) and three short (^^ mm.) in the largest 

 specimen, two long and one short in the other. The longi- 

 tudinal muscles of the body wall are very prominent. The ali- 

 mentary canal is almost straight so that the mesentery which 

 supports it is confined to the mid-dorsal interradius. The 

 oesophagus is wide and the stomach is quite prominent (Fig. 13). 

 The haemal system is very noticeable on the latter and on the 

 intestine also. The ciliated funnels are of two kinds (Figs. 1 1 

 and 1 2) and occur not only near the mesentery in the mid- 

 dorsal interradius, but, in the left dorsal interradius, they form a 

 prominent line over 100 mm. long. The large ones are com- 

 paratively few but the small ones are crowded. The former are 

 about I.I mm. long and .500 mm. wide, while the latter are 

 only .110 mm. long but are .133 mm. wide. In length both 

 sorts of funnel are about equal to the corresponding ones in in- 

 hcBrens, but they are much wider so that the proportions are 

 quite different. Their shape and proportions can be best under- 

 stood from the figures. There is no cartilaginous ring. The 

 calcareous ring (Fig. 10) is narrow and its pieces are wide so 

 that their relative proportions are quite different from inhcerens. 

 Moreover the opening for the passage of the radial nerve is very 

 wide and narrow instead of circular, and is slightly overarched 

 by the main body of the radial piece. The anchors and plates 

 are of two kinds very different from each other in size and shape. 



