Journal of conchology . o died comparativelyrecently :—Colonel Messager, of the Colonial Infantry, Commander of the Legionof Honour, died on December 4th, 1915, at his home at Rochefort-sur-Mer. Hewas best known for his researches in Tonkin. Dr. Pierre Marie Henri Fischerdied on July loth last, at 51, Boulevard St. Michel, Paris, at the age of was editor of the Journal de ConehyIt0logic, and a member of very manylearned societies. 124 NOTE ON THE GENITALIA OF THEBA CANTIANA Mont. By a. E. boycott. (Read before the Society, Dec. 8lh, 1915). So little is known of the physiology of the g
Journal of conchology . o died comparativelyrecently :—Colonel Messager, of the Colonial Infantry, Commander of the Legionof Honour, died on December 4th, 1915, at his home at Rochefort-sur-Mer. Hewas best known for his researches in Tonkin. Dr. Pierre Marie Henri Fischerdied on July loth last, at 51, Boulevard St. Michel, Paris, at the age of was editor of the Journal de ConehyIt0logic, and a member of very manylearned societies. 124 NOTE ON THE GENITALIA OF THEBA CANTIANA Mont. By a. E. boycott. (Read before the Society, Dec. 8lh, 1915). So little is known of the physiology of the genital apparatus inmollusca that it seems worth while to record observations even astrivial as the following. As is well known (see C. Ashford, thisJournal., vol. iv., p. 269 and plate x) T. cantiana has a long (about17 mm.) thin tubular organ opening into the atrium: its homologyis doubtful, it does not seem even to have a definite name and itsfunction is, I believe, quite unknown. In June last, near St. Albans,. I found a pair in copula : subsequent dissection showed that the actwas so far complete that spermatophores had been exchanged andwere found in the ducts and vesicles of the spermathecse. The doubtful organs appeared abnormally short and bulky : they areshown at C and D in the figure compared with those (A and B)from two individuals exhibiting no signs of sexual activity, taken at BOYCOTT : GENITALIA OF THEBA CANTIANA. I25 the same time and place. Closer examination suggested that thisappearance was due to invagination or, more properly perhaps,intussusception, the process being more advanced, or less regressed,in D than in C. Transverse sections confirmed this view andshowed clearly that the organs were folded up. F gives diagram-matically a section across D about the level of the distal flexure infigure D ; the epithelial lining is shown in heavy black, the muscularwall streaked. The first space from the periphery is the lumen ofthe organ, the second the body
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