346 Hi. J. Clark on Lucernaria. 
ArT. XXXIV.—Lucernaria the Ceenotype of Acalephe ; by Prof. 
Henry JAMEs CLARK, of Harvard University, Cambridge.’ 
THE present communication is a mere sketch of a most thor- 
ough and exhausting anatomy of Lucernaria, which I have illus- 
trated by numerous plates, and which I propose to publish im 
an extended memoir, in connection with some considerations 
upon the general morphology and systematic relations of Aca- 
lephe. I have been engaged during the whole of the past year 
upon the organical and histological anatomy of this animal, in 
order to determine what are its relations to Radiata in general, 
and to Acalephe in particular. I have had abundant materials 
for study, inasmuch as this species of Lucernaria is a very com 
mon inhabitant of our shores, wherever the eel-grass, Zostera 
marina, grows. Almost invariably Lucernaria is to be found 
upon the Zostera, and very rarely upon any other plant. It 
may be obtained from the last of August, when it is most ie 
quently met with in a young state, until the last of June, at 
least disturbance; and, as the muscular system is tions of is 
the disc, it is most natural that when the creature cone 
should draw the two halves of the genitalia and the bune : oo 
From the Proceedings of the Boston Society of Natural History, for ™™ 
_ 19th, 1862; with additions and notes by the author. oe 
