H. J. Clark.—T'ubularia Not Parthenogenous. 63 
Jibrille’ lying between and behind the innermost and middle 
walls of the disc.” Thus I had verified the existence of a mus- 
ovis for this divergence from the base upon which I began, 
ecause I hope thereby to disclose the more general prevalence 
of this myological feature in the mor hology of Acalephe. 
During my studies upon the development of the eggs of the 
W 
Later, Huxley described the system in Siphonophore, as being in the outer wall, 
We owe to Allman the credit of having first pointed out, in the hydraform, the 
nature and true position of the muscular system. He says, ( and Physiol. of 
Cordylophora, Phil. Trans, 18538, p. 372), “It consists of numerous longitu 
res, which are j 
The most elaborate attempt upon this subject is that of Agassiz. _ His 
of the muscular system of Hippocrene, Sarsia and Tiaropsis, in his monograph, on 
the Acalephx of North America, Mem. Am. 
ilar 
fibres may be witnessed in Coryne, Syncoryne, and other marine — yet &e. 
ec cau 
of the walls, produced by contraction, as muscular fibres ; and everywhere the cell 
of either the innermost or middle wall are described as “ contractile cells” of the 
muscular layer. The truth is, the muscular layer is composed of fibrille, Pebowe 
i e 
