298 JOURNAI. OP CONCHOLOGY, VOL. 12, NO. II, JULY, I909. 



three and the last are here shown, with the outline of cones and apex 

 of an intermediate uncus. 



V. fnoulinsiana exhibits the typical Vertigo form of uncus through- 

 out the radula. Accessory cones occur even in the centrals. There 

 is no distinction between admedians and externals, all the pleurals 

 being of the same type, and in fact of the same type as the central. 

 They are of the capital E form before alluded to. 



Lilljeborgi may be said to have eight or nine admedians, while 

 ventricosa only shows three or five. It is not, of course, possible to 

 give such numbers with any great degree of precision, as the plate 

 will show ; but the transition between the two types in ventricosa is 

 much more rapid. The form of admedian occurring in both these 

 species is closely allied to that found in Succineids, and the form of 

 the lacinia (best seen in isolated unci viewed laterally) is quite like 

 that found in our smaller Succinece. Attention should also be drawn 

 to the great distinction in the shapes of the basal plates. Those of 

 V. inoulinsiana are remarkably regular in size and shape throughout ; 

 this suggests that the radula itself lies more flatly than usual, with its 

 margins less curled back. Sections of the odontophore show that 

 this is actually the case. 



The size of these structures may be ascertained from the scale, 

 each division of which is equivalent to "001 mm. 



Our thanks are due to Mr. B. B. Woodward for many useful sug- 

 gestions and much help in preparing these notes. 



Vallonia excentrica Sterki in West Norfolk. — From among a small 

 number of Vallonia costata (Mliller), which I collected at Burnham Market in 

 Norfolk (West) in November last, and sent on to my friend Mr. J. Davy Dean, 

 of Lancaster, for verification, he has separated out one shell, which he says is un- 

 doubtedly Vallonia excentrica Sterki. I have since carefully compared it with 

 some excentrica from the Lune Valley in my collection, and am convinced that he 

 is right. V. costata seemed to be fairly plentiful ; I hope to find on my next visit 

 that V. excentrica is so too. In view of the confusion which has existed in regard 

 to this group, it becomes important to place on record any occurrence of the several 

 species, as our knowledge of their distribution is largely hidden under the old 

 name pulchella. I have, therefore, written this note, hoping that the record of 

 the occurrence of excentrica and also of costata in West Norfolk may be of some 

 value to those members of the Society who are interested in the distribution of the 

 genus Vallonia. — [Rev.] C. E. V. Kendall [Read be/ore the Society, Feb. lOth, 

 1909). 



