L.M.B.O. MEDUSAE. 259 



then it has been described under many names and by 

 many naturalists. 



One specimen taken at Port Erin, Aug. 1892. Fairly 

 abundant during May and June, 1893. Many specimens 

 were often left on the sandy beach by the tide. Daring 

 April, 1894, I obtained several young stages in the bay. 

 One specimen taken on April 18th, umbrella 7 mm. long, 

 and 4 mm. wide. At the aboral end of the umbrella there 

 is a large globular mass of tissue, which looks like a knob 

 on the top of the umbrella. Four broad radial canals, 

 manubrium about one-third the length of the umbrella- 

 cavity, mouth wide with four large ]ips. On the margin 

 of the umbrella four perradial tentacles, of which two, 

 opposite ones, are larger and longer than the others. The 

 basal bulbs of these tentacles are large and long, each 

 with a reddish ocellus. There are also four interradial 

 tentacle-bulbs, with ocelli but without tentacles. A 

 specimen taken on April 10th, with a short conical knob 

 at the aboral end of the umbrella. On the margin of the 

 umbrella there are four long perradial tentacles, four large 

 interradial tentacle-bulbs without tentacles, and eight 

 small adradial tentacle-bulbs. Another specimen taken 

 on April 10th, umbrella 4 mm. long and 2^- mm. wide, 

 four perradial tentacles, 20 mm. long when fully expanded, 

 four short interradial tentacles, and eight adradial tenta- 

 cular-bulbs without tentacles. These three specimens 

 show clearly the increase of the tentacle-bulbs and 

 tentacles. In some specimens the number of tentacles 

 exceeds eighteen. Gosse records a specimen with twelve 

 tentacles and three tentacle-bulbs between each, the 

 central one being the largest. I have seen a specimen 

 with eighteen tentacles, and a tentacle bulb between every 

 two of them. Probably the maximum number is about 

 48 tentacles. 



