1897.] Chaster. — Mari7ie Molhisca of Raihlin Island. 185 



This dredged material looked decidedly unpromising ; a few 

 living Dentalia and a mass of mostly broken bivalve shells 

 being all there was to be seen. On carefully examining 

 it at home it was found that, although we had failed to 

 obtain even a valve of our desideratum, M. donaci?ia, 

 still the yield was of great interest. There were several 

 examples of a little known species, Neolepton obliqicatum^ 

 Monts., previously recorded as a rarity from two Mediter- 

 ranean localities. This constitutes the fourth addition to 

 the British moUuscan fauna obtained from our dredgings off 

 the Antrim coast. 



The following notes on some of our finds may be of 



interest: — 



Turbonilla pusilla, Ph. (non JefF.) 



Chemnitzia pusilla, Philippi, 1S44. Kn. Moll. Sic, II., p. 224, pi. xxviii., 



fig. 21. 

 Odostornia lactea, var. [} pazilluld) Jeff. (Br. Conch, iv., p. 164.) 

 Dr. Dall has kindly compared typical specimens of this species with 

 the shells in Jeffreys' collection. He informs me that there are no 

 specimens named *' 0. lactea, var. paulhila,'" but that the examples 

 I sent agree with Jeffreys' " O. lactea, var. d.'" It is certain that 

 Jeffreys confounded the present species with lactea and that his 

 variety paiillula is untenable. Of this species we obtained one live 

 and several dead specimens. 



Pyrgostclis intcrrupta, Totten. We obtained a fine series of live 

 specimensof this species, better known by the name " Odostornia mfa.'' 

 As the synonymy of the species has never been fully and correctly 

 set foith, I will venture to give it. The species is the type of a very 

 distinct group which the Marquis of Monterosato has designated 

 Pyrgostelis {Fyrgisculus of the same author I cannot consider separable. 



Forma typica. 



Pyrgostelis interrupta, Totten, sp. 



Turritella interrupta Totten, 1835, Am.Jouni. Sci., O.S., vol. xxviii., No, 2., 

 p. 352, fig 7- 



Turritella fulvocincta, Thompson, 1840, Ann. Mag. Nat. Hist., vol. v., p. 98. 



Odostornia rufa, \^r. fulvocincta, Jeffreys, in all writings. 



This well known form must be considered the type of the species. It 

 has convex whorls, usually a peripheral reddish band, and some- 

 times less marked sub-sutural and basal bands as well. I have 

 compared our shells with American specimens kindly sent by Dr. 

 Dall, and can find no difference worthy of note It is the most 

 common form in our Church Bay dredgings. 



