COOKE: ON ALOPIA CVCLOSTOMA, A. CANESCEN'S AND A. DEANIANA. 305 



Unfortunately, Kimakovicz in his "Prodronms'' (Verb. Siebenb. 

 Ver. xliii, pp. 19-58, 1893), for reasons he does not explain, substitutes 

 the name nota Kim. for livida Menke, and regards maxima A. Schm. 

 as a subspecies of nefasta Kim., a form peculiar to the Bratocia, which 

 is many kilometres distant from the Torzburg Mogura. These 

 vagaries may be disregarded. 



A careful examination of specimens of livida var. fiiaxima shows 

 that it is not a var. of livida, but must be regarded as a distinct and 

 new species. I propose to name it Alopia dgiiniana, after my friend 

 Mr. J. Davy Dean, who has done good work on the C/ausilia of this 

 group, and who first noticed the internal differences between it and 

 livida. There is already at least one CI. maxima (Grateloup, Actes 

 Soc. Linn. Bordeaux, x, p. 150, pi. 4, f. 17, 1838). 



The shell of livida is invariably of a characteristic blue-grey, the 

 blue tint being more or less marked. I have collected it in hundreds, 

 from all sides of the Bucsecs, the Malajester Schlucht, the Fr. Deubel 

 W'eg, the Bucsoiul, the La Strunga Pass, from the Val Jepi and the 

 Furnica in Roumania, and from the Mte. Vulkan in the Abrudbanya 

 district. 



As compared with livida, the shell of deaniana is narrower and 

 more tapering, uniformly longer, suture less impressed, the character- 

 istic white sutural band of livida narrower and less conspicuous, 

 striations on body whorl always present, finer, and extending further 

 from the outer lip, lip more decidedly patulous, colour dark-brown, 

 never blue grey (See pi. ix, f. 9). As regards internal development, the 

 position of A. deaniana can best be appreciated by a comparison of 

 some of the other non-clausiate species. 



Li A. haueri Bielz (the "simplest" form, probably a variety of A. 

 canescens Charp.) there is no folding and scarcely any flattening of the 

 columella. 



In A glauca Bielz et auctt. folding and flattening are present to a 

 slight extent. 



Li A. livida Menke a fold is well developed and the columella is 

 flattened. 



Li A. deaniana the process is carried still further, and a columella 

 groove is formed, into which the "proximal end" or tip of the clausilium 

 could pass, if it existed. 



\x\ other words, deaniana represents the fourth term of a series of 

 developmental changes, the ultimate occasion of which is the reception 

 of a clausilium (See pi. ix, figs. 1-4). 



