JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE I, 
Illustrating Dr. Cobbold’s paper on Thaumantias achroa. 
Fig. 
1.—Thaumantias achroa, natural size. 
2.—Part of the convex surface of the umbrella, magnified 250 diameters. 
3.—Free extremity of a tentacle, magnified 40 diameters. 
4.—Portion of the same, magnified 250 diameters. 
5.—Proboscidiform peduncle, magnified 40 diameters. 
6.—Reproductive gland, magnified 40 diameters. 
7.—Radiating vessels and peduncle, viewed from above; showing more 
particularly the direction of the circulation and the form of the 
digestive cavity. The central vascular space is out of focus. Mag- 
nified 80 diameters. 
8.—Margin of the disc, with an ocellus between two tentacular bulbs, 
magnified 60 diameters. 
9 —Tentacular bulb and marginal vessel, magnified 250 diameters. 
10.—Ocellus and marginal vessel, magnified 250 diameters. 
11.—Central vascular space, magnified 250 diameters. The last three 
figures exhibit the circulating corpuscles. 
12.—Marginal portion of a reproductive gland, showing the ova and paren- 
chymatous cellules, magnified 250 **~ters, 
