1897.] MR. E. T. BTIOW.VE ox BRITISH MEDUS.B. 829 



No. 1. Umbrella 25 mm. in diameter. 



The stomach is very broad at the base, which is slightly convex 

 in shape, and about 18 ram. in diameter. The mouth has about 

 55 simple folds, and, when expanded, is 7 mm. in diameter. No 

 less than 140 radial canals leave the stomach, and out of these 45 

 enter the ring-cana1, the remainder showing various stages in 

 dsvelopment. At this stage the generative cells are just visible 

 upon some of the canals. Upon the margin of the umbrella there are 

 four large tentacles, when expanded about 20 mm. in length, situated 

 at about equal distance apart, and there is also a small tentacle, 

 about midway between the large tentacles, in three of the quadrants. 

 The fourth tentacle, to make this series complete, has not yet 

 begun to grow. In addition to rhe tentacles there are about 100 

 marginal bulbs, varying in size, from which tentacles develop in 

 the later stages. 



The marginal vesicles are very numerous, but not constant 

 in number and position, generally two between every two bulbs. 



No. 2. Umbrella 30 mm. in diameter. 



This specimen shows a later stage in development as there are 

 8 large tentacles, but the numbers of marginal bulbs and vesicles 

 are about the same as in the first specimen. The radial canals are 

 not nearly so numerous, only 114 present. About half enter the 

 ring-canal, the others show various stages of growth and usually 

 alternate vi-ith the former. In one place on the umbrella there is 

 a union of four adjacent canals, which again branch into three 

 canals. 



No. 3. Umbrella 55 mm. in diameter. 



The base of the stomach shows a well-marked convexity, 26 mm. 

 in diameter, which is formed by a thick mass of mesogloea. There 

 are 16 tentacles present, which may be divided into three sets — 

 four very long, four moderately long, and eight very short. Nearly 

 all the radial canals (145 in number) unite with the ring-canal. 

 The gonads, o\\ ing to their increase in size, are conspicuous, and the 

 marginal bulbs and vesicles are very numerous, as in the preceding 

 specimens. 



No. 4. Umbrella 60 mm. in diameter. 



The base of the stomach measures 33 mm. in diameter and has 

 a conspicuous convexity. The stomach itself, though very broad, is 

 very short, and the mouth measures 17 mm. in diameter when ex- 

 panded. There are 28 tentacles, varying in length, eight of which 

 are very long, and about 40 marginal bulbs. The radial canals, 

 about 180, nearly all unite with the ring-canal. One canal on 

 leaving the stomach divides into three branches, and another into 

 two branches. The generative cells show a further stage in 

 development. 



No. 5. Umbrella 135 mm. in diameter. 



The first four specimens show a gradual increase in size and in 

 development, but there is a slight gap in the series between this 

 specimen and the last one. The umbrella is very flat on the top 

 and about four times as broatl as high. The growth of the stomach, 



