. The Conchologist. THE CONCHOLOGIST. NOTES AND QUERIES. Molluscan Parasites. — Very little, I believe, has been written on the subject of Molluscan Parasites, and yet the subject is one of great interest. I write these few notes hoping that some conchologists may be able to add to our present knowledge. The PhilodroDius h'/iiacu/n of Jenyns is well known to all conchologists, but there is a species I have often found on Helix arbustorum which seems to differ from this On a number of the Livinxidc^ I have often noticed a worm-like parasite; some Mr. W. E. Collinge sent me appear to differ from
. The Conchologist. THE CONCHOLOGIST. NOTES AND QUERIES. Molluscan Parasites. — Very little, I believe, has been written on the subject of Molluscan Parasites, and yet the subject is one of great interest. I write these few notes hoping that some conchologists may be able to add to our present knowledge. The PhilodroDius h'/iiacu/n of Jenyns is well known to all conchologists, but there is a species I have often found on Helix arbustorum which seems to differ from this On a number of the Livinxidc^ I have often noticed a worm-like parasite; some Mr. W. E. Collinge sent me appear to differ from those I have generally found ; careful examination may prove them to be another species. Mr. Collinge also sent me a number of parasites found on Arion ater, which were certainly not Philo- droimis lima cum. They unfortunately came to grief in course of transit, but he hopes to be able to obtain more, which will be duly described in the pages of " The ;—J. Galton. Literature on the Sphaeriidae.—Will any of your readers kindly give me a list of the principal writings on the life-history, anatomy, and variation of this family ?— Thos. R. Walker. Illustrations of Varieties.—Can any of your readers inform me where I can find illustrations of the following varieties: — Limrura paliistris \'ar. ti/icta, Jeff, Z. truiicatula var. ventricosa^ Moq., and Helix arbiistornm var. conoidea, Westrl. — J. E. Maud, ANSWERS TO CORRESPONDENTS. All comniitjiiiations i)ite)ided for fiibUcation must he authenticated ivit/i natnc and address of sender. J. W.—We thank you for your letter and good wishes. We may treat of the subject you name in future numbers. J. F. B.—The shigs received are all Arion ater, with a number of the variety rufa. \Ye ihank you for the same. C. M. N.—We should recommend glass-top boxes for the type collection, and glass tubes for the remainder. L. B. T.—The list you require was published in the "Zoologist," p. 4022, 185
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