The Annals and magazine of natural history; zoology, botany, and geology . maturity, whenthis becomes more intense, and thus they contrast stronglywith the rest of the substance. The ovabearing specimenswhich I possess are :—Halisarca lobularis, obtained from thisshore in July 1874; Aplysina corneostellata, from Vigo Bay,by Saville Kent, &c, June 1870; Isodictya simulans,from this shore (here the ovum is white), July 1874 (at thistime also I found Esperia and Ilalichondria sanguinea in an ova-bearing state, but did not preserve any of them); lastly,Grantia compressa, from this shore, Ma
The Annals and magazine of natural history; zoology, botany, and geology . maturity, whenthis becomes more intense, and thus they contrast stronglywith the rest of the substance. The ovabearing specimenswhich I possess are :—Halisarca lobularis, obtained from thisshore in July 1874; Aplysina corneostellata, from Vigo Bay,by Saville Kent, &c, June 1870; Isodictya simulans,from this shore (here the ovum is white), July 1874 (at thistime also I found Esperia and Ilalichondria sanguinea in an ova-bearing state, but did not preserve any of them); lastly,Grantia compressa, from this shore, May 1871, viz. thoseindividuals which were successfully fed with indigo. does not give the date of his observing the sperma-tozoa in Sycandra raphanus, although, from his paper havingbeen read in the month of November, it may be inferred thatthis took place during the preceding summer. It is desirableto add the dates of such observations, because they may notonly be a guide to others, but finally fix the period of thismode of reproduction in the EXPLANATION OF TPIE WOODCUTS. Fig.\. Suberites domtmcula, Nardo, natural size. Section of, showing:—a a a, sponge; b b, cavities left by the lower whorls of the en-closed shell (Turritella), which have disappeared; c, remainingportion of the shell, covered with the ovigerous layer. Fig. 2. The same. Fragment of vertical section of ovigerous layer,showing:—a, convexities of capsules towards the sponge; b,flat membrane covering the shell. Scale about l-24th tol-1800th inch. Fig. 3. The same. Fragment of ovigerous layer viewed from the spongeside, showing the juxtaposition of the ova: a, ovum, on whichthe granulation of the surface is depicted. Same scale. Fig. 4. The same. Fragment of the granulated surface, much about l-24th to 1-G000th inch. Microscopic Sexual Characteristics of Oysters. 37 V.— The Microscopic Sexual Characteristics of the Ameri-can, Portuguese, and Common Edible Oyster of Eur
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