OF MEDVS.E MADE BY WILLIAM KEITH BROOKS. 11 



Genus DIPLEUROSOMA Axel Boeck, 1866, sens, emend. 

 Dipleurosoma brooksii sp. nov. 



This form is described from drawings made by the late Prof. William K. Brooks, and 

 tound after his death among his unpublished figures. The drawings were generously pre- 

 sented to the author by the Department of Biology of the Johns Hopkins University for 

 reproduction in this work. 



Bell flatter than a hemisphere, evenly rounded, thin walled. Manubrium small, short, 

 and 8-sided. 8 simple lips, 4 long and 4 short. 8 radial-canals arise from the stomach; 

 the 4 in the radii of the long lips are trident-shaped, each giving rise to 2 side branches. 

 The 4 canals in the radii of the short lips are simple. Thus 16 terminal branches reach 

 the circular vessel. In the specimen figured by Professor Brooks only 14 canals joined with 



FIG. Ii8a. Dipleurosoma brooksii sp. nov. A, oral view; B, side view 

 with tentacles cut off short; c, oral view of lips. 

 Drawn from life by Professor Brooks. 



the circular vessel, for two of the side branches of the main radial-canals failed to develop. 

 There appear to be typically 16 tentacles, one at the base of each terminal branch of the 

 radial-canals, although in two intervals there are small additional tentacles thus giving 18 

 tentacles in the specimen figured by Professor Brooks. The tentacles have long, conical, 

 tapering basal bulbs, which are hollow and very long, lash-like shafts, longer than the bell- 

 diameter and very flexible. No ocelli are figured by Professor Brooks. The gonads are 

 upon the sides of the 16 radial-canals, not touching the ring-canal but extending from the 

 sides of the stomach outward. The velum is a wide, annular diaphragm. The size and 

 color of the medusa can not be determined from Professor Brooks's drawings. The 

 medusa was found at Nassau. Bahama Islands. 



