OF CONCHOLOGY. 25 



NOTE ON CYCLOPHORUS FOLIACEUS, REEVE (NON 

 CHEMNITZ I, AND C. LEAL TRYON. 



BY GEO. W. TRYON, JR. 



When I wrote the description of fCyclostoma Lcai, published 

 in this journal (V. part 2), Reeve's Monograph of Cychphorus 

 was not accessible to me. I now find that my species is figured 

 in the Iconica (figure 52) as Cyclopliorus foliaceus, Chemnitz, and 

 the Andaman Islands assigned as locality. Mr. Reeve remarks : 

 " It was admirably figured between seventy and eighty years 

 ago by Chemnitz, but the figures of the Conchylien Cabinet have 

 been regarded as representing worn specimens of the well-known 

 Otopoma Naticoides, from Socotra, which has a shelly operculum. 

 Dr. Pfeiffer separated it from that species in 1846, in his Mono- 

 graph of Cyclostoma, in Klister's edition of the ' Conchylien 

 Cabinet ;' but in his subsequent monographs he abandoned that 

 view, and quoted it as a synonym of 0. Natieoides. Mr. Ben- 

 son's discovery, confirming the original species of Chemnitz, was 

 made known in the 'Annals and Magazine of Natural History' 

 for February, 1860, and January, 1861. It will be seen that 

 Mr. Benson's specimens are smaller than that figured by Chem- 

 nitz, but he thinks it probable that larger specimens may be 

 found when the exploration of the main island of the group can 

 be safely attempted. The varicose repetition of the lip appears 

 to be a constant character of the species." 



In 1865 Pfeifier published a second supplement to his mono- 

 graph, and therein changes his views of the species in question, 

 adopting the opinions of Messrs. Benson and Reeve. 



Neither of my specimens contained an operculum, so that, to 

 me, their generic position was doubtful ; but those submitted to 

 Mr. Benson contained horny opercula, and thus he has placed 

 the species in Cydopliorus. 



That Reeve's shell figured is the same as mine, I do not doubt ; 

 but it is certainly different from the species figured by Chemnitz. 

 The latter is much larger, and the foliations are continued across 



