108 Annals of the South African Museum. 



and the base of the columella ; (iii) a hardly visible columellav plait 

 just below the second tooth. 



Dimensions of middle shell in Type set : — Long. 10'4 ; lat. 6-0 ; 

 apert. 7"lx4-5; last whorl, 9-3 mm. 



Other examples of the same set measure : — 



Long. 10-3; lat. 6-2; apert. 7-0 x 4-2; last whorl, 94 mm. 

 9-3; „ 5-5; „ 6-0 x 3-9; „ „ 8-0 „ 



Animal unknown. 



Hah. South America. Chiloe Island, San Carlos Bay (King). 



Type in British Museum. 



In Pfeiffer's description of M. nigra he mentions that the right 

 margin is sometimes furnished with several very indistinct trans- 

 verse ridges ; but I can see no trace of these in any of the shells 

 which I have examined, and think it possible that the statement was 

 based on imperfectly cleaned specimens. 



It is so easy to confound Chile with Chiloe that it may be wiser 

 to omit any of the more northerly localities which have been quoted 

 for M. pejnta. M. callaoensis has never been described or figured, 

 and although H. & A. Adams mention the species as being in the 

 British Museum, I have been quite unable to find the shells in 

 question. Pfeiffer was entirely mistaken about the true pepita, but 

 his identification of callaoensis with nigra may probably be accepted 

 as correct. 



Whether Lowe's M. patuliis was really founded on this species, 

 in which case the name would have priority, is discussed under 

 M. xanthostovia, Ads. 



Marinula tristanensis, nov., 1915, 



1856 Marinula nigra, Phil, (pars), Pfr., Mon. Auric, p. 61. L. 



1857 „ „ ,, „ ,, Cat. Auric, p. 45. L. 

 1877 „ „ „ Velain,Arch. Zool.Exper.vi. p. 126. N. 

 1907 „ „ „ Melv. & Stand., Edinb. Trans. E. Soc. 



p. 142. L. 

 1910 ,, „ „ Hedley&Suter,Proc.Mal.Soc.ix.p.l51.L. 



Shell small, elongate-ovate, imperforate, solid, epidermis purple- 

 black, interior and columella paler. Spire moderately produced, 

 about two-thirds the length of the aperture ; sides rather convex, 

 apex minutely pointed. Whorls 3f, not very convex, rapidly 

 increasing, with fine, irregular striation follow^ing the lines of 

 growth. Suture very shallow. Aperture acuminate-ovate, outer 



