260 MR. E. A. SMITH ON THE [Apr. 5, 



species which have much the same type of form ; but this supposed 

 resemblance, in reahty, proves to be less, on a careful comparison of 

 the two types, than one at first would imagine. Perhaps the most 

 striking similarity to Pacific forms occurs among the PatulcB. Such 

 species as P. radiella, Pfr., P. multilamellata, Garret, P. acuiicostata, 

 Mousson, and others from the Polynesian Archipelago are exact 

 representatives of the Endodontce, or toolhed group of Patulce, from 

 St. Helena. Still, although these Pacific forms are certainly of the 

 same type, we must also remember that the same form of Patula 

 occurs in the island of Fernando Noronha, namely, P. quinquelirata. 

 Smith, and possibly also on the adjacent mainland of Brazil itself, 

 although its presence there has yet to be discovered. 



In the following complete list of the indigenous species references 

 are not given, as they are obtainable by consulting Mr. WoUaston's 

 work. In conclusion I propose to discuss one or two of the intro- 

 duced species. 



A. Indigenous Species. 



1. VlTREA MELLISSII (Wollastou). 



This minute species, which is known to me only by description, is 

 possibly an introduction. 



Patula (without teeth). 



2. Patula spurca (Sowerby). (Plate XXI. figs. 1, 1 a.) 



This species was unknown to Mr. Wollaston, and consequently 

 being misled by the somewhat poor figure given by Forbes, he has 

 placed it in the genus Hyalina ( = Vitrea). The examination, 

 however, of a number of specimens, some received from Mr. 

 Alexander, who furnished Forbes with his examples, others from 

 Capt. Turton, proves that it should be located in the group 

 Patula. Sowerby's description being so brief, I think it advisable 

 to recharacterize it, thus : — 



Testa anguste umhilicata, suhorhicularis, tenuis, alhida, rufo- 

 variegata, liaudnitida ; spiraparum elevata,ad apicem ohfiisa; 

 anfractus 5, convexiusculi, regulariter et lente accrescentes, 

 lineis incrementi tenuihus confertis fexiiosis ohliqiiis striati, 

 ultimus ad peripheriam rotundatus, antice liaud descendens ; 

 apertura late lunata, simplex, hand dentata vel lirata ; peri- 

 stoma tenue, margine columellari leviter expanso et reflexo. 

 Diam. maj. 5 millim., min. 4g, alt. B| ; apertura 2\ longa, 1| laia. 

 Hah. Sugarloaf Hill and Quarry {Turton). Extinct (? living). 

 In some specimens the spire is more elevated than in others, and 

 occasionally the apex is scarcely raised above the last whorl. The 

 majority of the examples examined have to a great extent lost their 

 original colour and are now of a uniform whitish tint ; but a few 

 from Sugarloaf Ridge, which have the appearance of live shells, look 

 of a pale reddish colour to the naked eye, but when viewed under a 



