THE BRISTLE PLUMULARIA. 311 they were Kestrels ; and this curious liabit of remain- ing suspended on the wing in the face of the wind, has acquired for them the provincial names of Standgale and Windhover. The pelting storm drove me into the house ; but when it had abated, after some half- hour's duration, I again looked out, and there were the hawks hovering yet, just where I had left them. THE BRISTLE RLUMULARTA. Aug. 4,th. — I found a Spider-crab in a hole, whither he had retired for the purpose of sloughing. The carapace and limbs were thickly studded with Ajiten- nularia antenniria, and Plamnlaria cristata, many stems of each well set with ovigerous vesicles. One of the stems of the latter bore, parasitically springing from it, many stems of a more delicate congener. Plum, setacea, and some of these were also furnish- ed with vesicles, which I presently submitted to examination. I selected a specimen with many vesicles, some empty, some broken oif in the middle, others contain- ing more or fewer gemmules, or "planules;" and one in the midst of the last-named, uniformly filled with the common granular matter of the medullary core, not vet condensed into ova. About five or six seemed to be the complete number of gemmules in one vesicle, of which those nearest the narrow neck w^ere alive and active, while the most remote was a small motionless sphere. My attention was presently attracted to a gemmule free in the water, which I knew to have just escaped,