248 ZOOPHYTES. 



nor differ in anything from those of the Chrysaora, the subject of so copi- 

 ous a commentary in the preceding volume. It appeared to me, that, 

 while moving, the broader extremity was always in advance. 



Plate LI. Fig. 5. Medusa capillata. 



6. Planulae from the same. 



§ 3. Medusa crinita. — Plate LII. Figs. 1, 2. — This animal is so 

 transparent that it can be hardly seen amidst the water. 



Specimens, of different dimensions, have occurred in May and in July : 

 that wherein the parts were best exposed, in the latter month, is repre- 

 sented Plate LII. fig. 1. A larger specimen, taken in May, formed about 

 the fourth or more of a hollow spherical segment, bordered by about 

 120 tentacula. Another, of nearly the same form, was six lines in diame- 

 ter, and between two and three in height. About 24 long extensile 

 tentacula, originating in a bulb, and very slender, hung down from the 

 margin. In the centre of the concavity was a tubular proboscidal organ, 

 with the mouth at the extremity, and four prongs around it. Besides 

 this, four equidistant cylindrical organs, possibly indicating the site of the 

 ovaria, are connected with the under surface. But all these parts are 

 very obscurely distinguished. Two cross lines, probably denoting vessels, 

 divide the upper surface in quarters. 



This animal swims by collapse of the umbrella, and thus seeks the 

 surface. The specimen, fig. 1, was quite vigorous and active, but the 

 parts became disordered, and it decayed in eight days. 



Plate LII. Fig. 1. Medusa crinita. 



2. Another specimen. 



§ 4. Medusa proboscidea. — Plate LIII. Fig. 1. 



(A.) The specimen, fig. 1, was taken accidentally in a jar of sea-water, 

 on June 5. 



Some of the Medusan tribes are thus brought under notice, but only 

 on emptying such vessels, for, in their native abode they would be in- 

 visible. 



