Journal of conchology . e Radula of Hyalinia, II. : Variation in the Radula of H. helvetica byProf. A. E. Boycott. Notes on Helicigona, by E. Collier. Exhibits. By Mr. R. Standen : A very beautiful specimen ui Liinax Jlavus var. coltibrina,collected at Newport, Isle of Wight, December, 1913, by Mr. Frank Morey. In the special exhibit of the evening, the genus Helicigona, Mr. Ed. Colliershowed an extensive series, comprising most of the known species. He gave aninteresting account of the chief characteristics of the various sections into which thegenus is subdivided. Mrs. Gill also exhibited a
Journal of conchology . e Radula of Hyalinia, II. : Variation in the Radula of H. helvetica byProf. A. E. Boycott. Notes on Helicigona, by E. Collier. Exhibits. By Mr. R. Standen : A very beautiful specimen ui Liinax Jlavus var. coltibrina,collected at Newport, Isle of Wight, December, 1913, by Mr. Frank Morey. In the special exhibit of the evening, the genus Helicigona, Mr. Ed. Colliershowed an extensive series, comprising most of the known species. He gave aninteresting account of the chief characteristics of the various sections into which thegenus is subdivided. Mrs. Gill also exhibited a number of fine examples of thegenus. Monstrosities of Tapes pullastra and Mactra stultorum.—The two shellsfigured were found in Studland Bay, Dorset, on March 25lh, 1913. The Tapespullastra is remarkably narrow and is much swollen. It bears a superficialresemblance to the variety ovata (which also occurs in the Bay), but it is really amonstrosity as its curious form is due to the abrupt truncation of the anterior Studland Bay has also yielded me some abnormal forms of Tapes aureus. TheiMacira stulforinu mimics a Corbula in shape. The smaller valve is flattened, whilethe laiger is more tumid than usual. I am unable to suggest any cause for thismonstrosity.—J. E. Cooper {Read before the Society, May 21st, 1913). ADDITIONS TO BRITISH CONCHOLOGY. By J. T. MARSHALL. Part VII. {continued from p. 128). Adula (Myrina) simpsoni Marsh.—In the Journal for Octoberlast, p. 126, under this name, I omitted to add the following additionalparticulars of this interesting species :—Soon after its original dis-covery, attached to the skull of a whale brought into the Aberdeenfish market by a trawler, some further specimens were discovered ina piece of pitch pine, which had been bored by Xylophaga and Teredo,and in the deserted tubes of which were about two dozen of theseAdula, attached by a byssus. Several were alive, and were placedunder examination. They were quite at home in a wat
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