ZOOLOGY,,-— VERMES, 545 



bergeii Sea, if not surpassing the power of numbers, 

 would at least exceed all the powers of the mind to 

 conceive. The minute medusae (PI. XVI. fig. 16.), 

 and moniliformes (fig. 17.), have already been describ- 

 ed ; the animalcula may be just noticed. Though 

 I could not speak positively to the vitality of both 

 the former substances, yet the animalcula were so 

 active in the water, as to prevent a moment's doubt 

 on the subject. Three kinds of animalcula are fi- 

 gured in Plate XVI, Nos. 18, 19, and 20. No. 18, 

 examined by a double microscope, appeared of the 

 size of a coarse grain of sand. It seemed of a brown- 

 ish colour, and moved nearly in a direct line. No. 19, 

 about half the size of the former, appeared globular, 

 had a dark-coloured sort of tail, and advanced by a 

 curious zig-zag motion. No. 20. was still smaller : 

 It moved with amazing rapidity, by sudden starts, 

 pausing for an instant between each impulse, and 

 then springing in a new direction. 



Besides these five minute animals, figure 15, 

 Plate XVI, represents a beautiful creature that 

 was brought up by the marine-diver, in the Spitz- 

 bergen Sea. Its length, excluding the antennse, 

 which were as long as the body, was one-tenth of 

 an inch in one specimen, and one-fourth of an inch 

 in another. Its body was beautifully transparent, 

 and had quite a crystalline appearance. The an- 

 tennae and tail were red. In swimming, it proceeded 

 by starts, and appeared very active. 



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