268 TEANSACTIONS LIVEBPOOL BIOLOGICAL SOCIETY. 



of the umbrella. A specimen taken on June 5th was 

 beyond the average size. It measured 8 mm. in length 

 and 6J mm. in width. About 12 marginal tentacles in 

 each of the four groups. The oral tentacles five times 

 dichotomously divided. During March and April, 1894, 

 I took with a tow-net some early stages of this medusa. 

 The earliest stage was taken on March 29th. The um- 

 brella about 1 mm. in diameter, with a broad velum. 

 Four marginal groups of tentacles ; two of which have 

 three tentacles and the others have only two. At the 

 base of each tentacle there is a crimson ocellus. The 

 compound tentacle-bulbs with two tentacles have also 

 three ocelli. The extra ocellus belongs to the third ten- 

 tacle which has not yet developed. The oral tentacles 

 also show an early stage of development, only three 

 branches, each terminating with a cluster of nematocysts. 

 Another specimen shows a further development of the 

 marginal and oral tentacles. There are three tentacles 

 in each of the marginal groups, but they are unequal in 

 length, one of the outside ones being about half the length 

 of the other two. At the base of each tentacle there is a 

 red ocellus. The compound tentacle-bulbs yellowish 

 brown. The oral tentacles have four branches. 



A specimen taken on March 31st has the central tenta- 

 cle of the three marginal tentacles the shortest, which 

 shows that the third tentacle in each group may either 

 develop on the outside of the two primary tentacles, or 

 between them. 



A specimen taken on April 3rd, about 2 mm. in diame- 

 ter, with five tentacles in each marginal group. The three 

 central ones large and about equal in length, and two, one 

 on each side of the central three, just beginning to develop. 

 The oral tentacles have five terminal branches, each ending 

 in a cluster of nematocysts. On May 9th a specimen 



