1907. Kennard. — On Vitrca (Hyalinia) hibernica. 329 



Description of Piate 42. 



Fig. 1. Vitrea lucida, Drap. — Bristol. X2. 



2. „ „ — Carrigrohane, Co. Cork. X2. 



3. ,, ,, — Dublin, x 2. 



4. V. hibernica, n. sp. — Beginiiish. X2. 



5. ,, ,, — Murlough Bay. X2. 



6. „ „ — Dog's Cave, Ennis. X2. 



7. ,, ,, — Rostrevor. X2. 



8. V. cellaria, Miill.,— Cudham, Kent. X2. 



9. „ ,, — Lancaster. x2. 



I, 4, 5, 6, 8, from the author's collection; 2, from J. N. Milne 53, 

 Dublin Museum ; 7, A. W. Stelfox ; 9, J. W. Jackson. 



Note on the Anatomy of Vitrea hibernica. 



by the rev. e- w. w. boweu*. 



The specimens of V. hibernica sent me by Mr. Kennard 

 differ notably from V. cellaria as it occurs in this country. 

 They were larger than the average, and the colouring was of 

 a dark slate blue, somewhat resembling the tone of the 

 pigment known as ultramarine ash. On examination, it was 

 found that the cells of the skin were more opaque than those 

 of cellaria : they were also more symmetrical in their distribu- 

 tion, and cells containing brown or black branched pigment- 

 ary bodies seemed to be absent. 



Throughout this examination, I compared Mr. Kennard's 

 specimens with examples of cellaria from Penshurst and 

 Sissinghurst (Kent), and the preparations here contrasted 

 were in each case submitted to the same treatment throughout. 

 As I have dissected over 100 cellaria during the past year, I 

 am able to say that the specimen here selected for comparison 

 was normal. 



In respect to all details of anatomy V. hibernica proved to 

 be more thickset and strongly built. This is well exempli- 

 fied in fig. 1, which represents the radulae of the two species 

 as they appear in their natural investments and muscular 

 attachments. 



Fig. 2 shows the genitalia of V* hibernica. It will be noted 

 that the sperm atheca is a flat, and spoon-shaped organ, very 

 different from the globular or sub-globular spermatheca of 



