176 



CORYNE ROSARIA. 



served, I am unable to state this positively. It seems to make but 

 little difference to the Hydrarium (Figs. 286, 287, 288) or to the 



Fig. 286. 



Fig. 287. 



Medusa whether they live in pure sea water, such as they find at 

 Nahant, or live in the more brackish waters of the inner harbor of 

 Boston ; they are equally abundant in both localities. 



Massachusetts Bay (L. Agassiz). 



Cat. No. 45, Nahant, Mass., May, 1862, A. Agassiz. Hydromedusarium. 



Cat, No. 60, Nahant, May, 1862, H. J. Clark. Hydrarium. 



Cat. No. 64, Nahant, March, 1862, H. J. Clark. Hydrarium. 



Cat. No. 268, Boston, April, 1862, A. Agassiz. Young Medusas. 



Cat. No. 269, Boston, May, 1862, A. Agassiz. Young Medusas. 



Museum Diagrams, No. 20, 21, after L. Agassiz. 



Coryne rosaria A. AGASS. 



Coryne rosaria A. AGASS. ; in Agassiz's Cont. Nat. Hist. U. S., IV. p. 340. 1862. 



I have but little doubt that the Hydroid here described is the larva 

 of Coryne rosaria ; this settles any doubt there may be concerning the 

 specific differences between this Medusa, and the European or American 

 representatives on the two sides of the Atlantic. The Hydrarium re- 

 sembles somewhat Coryne stirjula of Sars, but the proportions of the 

 individuals of these two Hydraria are totally different ; what is particu- 

 larly characteristic of Coryne stipula is the stoutness and great size of 

 the head and stem, compared to the size of the community ; in Coryne 

 rosaria the heads, which are quite slender, are supported by remark- 

 ably long and attenuated stems ; they branch also very profusely, and 

 it is not uncommon to find communities of this graceful Coryne reach- 

 ing a height of three to three and a half inches. Medusas buds were 



Fig. 286. Cluster of Ilydraria of Coryne mirabilis. 



Fig. 287. Young Hydrarium. 



Fig. 288. Magnified view of a head with Medusa bud, f/, attached. 



