Medusae of the world . Fig. 208.—Microhydra ryderi,from camera-lucida drawings by Prof. J. Percy Moore, kindly lent to author by Mr. EdwardPotts. The medusae were drawn from specimens 48 to 50 hours old. These medusae bud off singly from the side of a small hydroid which is devoid of tentaclesand lives in the rocky bed of Tacony Creek, a rapidly flowing, fresh-water tributary of theDelaware River, near Philadelphia, Pennsylvania. Potts believes that this form may event-ually prove identical with Craspedacusta sowerbii of the Regents Park, London. The hydroid is clavate, almost cylindrical, wit
Medusae of the world . Fig. 208.—Microhydra ryderi,from camera-lucida drawings by Prof. J. Percy Moore, kindly lent to author by Mr. EdwardPotts. The medusae were drawn from specimens 48 to 50 hours old. These medusae bud off singly from the side of a small hydroid which is devoid of tentaclesand lives in the rocky bed of Tacony Creek, a rapidly flowing, fresh-water tributary of theDelaware River, near Philadelphia, Pennsylvania. Potts believes that this form may event-ually prove identical with Craspedacusta sowerbii of the Regents Park, London. The hydroid is clavate, almost cylindrical, with a rounded, upper mouth-end, devoid oftentacles. It usually grows singly, although occasionally two are seen connected at theircommon base. The hydroid gives rise to sausage-shaped buds which arise from the side ofthe parent hydroid. These buds develop in such a manner that the final separation of thebud occurs at one side instead of being terminal, as in Craspedacusta. When set free the budfalls to the bottom and m
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcnidari, bookyear1910
