218 Mr. H. B. Preston on new 



greatest breadth 8"5 ; interorbital breadth 4' 5 ; height from 

 ba?ion 4'7 ; upper tooth-series 7*8 ; horizontal lengtli of V 1*3 ; 

 front of p' to back of m^ 4'1. 



Hab. Mt. Arizan, Central Formosa. Alt. 8000'. 



Type. Adult skull, teetli still unworn. B.M. no. 12. 11.23.2. 

 Collected and presented by Walter Goodfellow, Esq. 



This shrew is readily distinguishable from the other 

 members of Chodsigoa by its much smaller size and its 

 unusually delicate ^^ Its occurrence in Formosa extends 

 consideiably the known range of the genus, which has 

 hitherto only been found in Northern and Western China. 



Its external appearance is probably not very dissimilar 

 from that of the other Arizan shrew, Sortcuhis fumidus, as 

 Mr. Goodfellow brought home the typical skull as being just 

 an extra skull of that species, 



XX. — Descriptions of Fifteen veto Species and Varieties of 

 Marine S/iells from the Falkland Inlands. By H. B. 

 Peeston, F.Z.S. 



[Plate IV.] 



Pareutheria fuscata (Brug.) *, var. curta, var. n. 



Shell differing from the type in its shorter and more ovate 

 shape, the wliorls being much shorter and broader and the 

 aperture more auriform than in the typical form. 



Alt. 25, diam. maj. 14 mm. 



Aperture ; alt. 9^ diam. 8 mm. 



Hah. Port Stanley Harbour, Falkland Islands {A. O. 

 Bennett^. 



Natica falklandicttj sp. n. (Fig. 1.) 



Shell perforate, ovate, solid, yellowish white ; whorls 4|, 

 regularly increasing, shouldered above, the last whorl large 

 and somewhat lengtliened, marked only with transverse 

 growth-lines, suture well impressed; umbilicus moderately 

 wide, very deep ; columella obliquely descending, somewhat 

 outwardly thickened above, and extending into a thick, 

 well-defined, parietal callus, which joins the upper margin of 

 the labrum ; aperture ovate. 



* Buccintan fuscat um, Brug., Kiener, Icon. Coq. vir. pp. 20-21, pi. viii. 

 fiff. 24. 



