574 BIOLOGY. 



mouth surrounded by four arms and very numerous ves- 

 sels, which run from the gastric cavity to its margins, 

 and there mostly elongate into filaments or hairs, being 

 thus true lymphatic vessels, which convey the nourish- 

 ment directly from the stomach through the whole body, 

 and become on its margin tentacula. 



3488. As antetypes of the Kracken they particularly 

 manifest the form of the Sepise, or Cephalopods, in the 

 strong and frequently papillated arms that surround the 

 mouth. Gland-like nodes are also developed in the 

 margin of the pileus, but their meaning is as yet doubtful. 

 Upon a higher stage, and they are antetypical of Insects. 



Their vascular system forms an exceedingly regular, 

 quaternary net, with branches and ramules ranging 

 opposite to each other, which have been believed to be 

 the vitelline network of the ovum when hatched. These 

 vessels terminate likewise in a common marginal vessel, 

 as in the vitellus. 



3489. Viewed as a whole they resemble in form, ap- 

 pendages, and substance the fcetal involucra or envelopes. 

 The upper surface may be compared with the convex 

 back of the envelopes, the lower to the concave funnel 

 of the umbilical cord, and the succigerent filaments or 

 hairs to the shags of the chorion. They are probably 

 elongated by injection, like the so-called legs of the Star- 

 fishes. 



The secretion of the ova in four ovaries speaks also in 

 favour of their higher grade of development. They lie 

 in four cavities around the stomach, which also open 

 near to the mouth. Their size also is significantly ex- 

 pressive of their higher position. 



Finally, they are of separate sexes. In them is the 

 milt for the first time distinctly displayed, and in the 

 same situation indeed where in other animals the 

 ovaries are. 



3490. Hence, in these three classes there are found 

 no more than three families, which together make up 

 only one order. The want of a fourth family and so on, 

 proves that the development of these animals does not 



