Land-Slielh ofihe Suhi Archipelago. 59 



23. Ilelicina Martensi, Issel. 



Helivina Martemi, Issel, Ann. Mus, storia nnt. Gonova, 1874, vol. vi. 

 p. 444, pi. vi. figs. 23-2o; Miillendorff, Jabrb. deutscb. mal. Gesoll. 

 1887, p. L'80. 



Uah. Tawi-Tawi, Bongao, and Sibutu {Everett) ; Bongao 

 {MoUendorff) ; Labuan (issel) ; Barit Mountain, N. Borneo 

 (Everett). 



I am inclined to think that this so-called species is merely 

 a dwarfed form of the Philippine H. polita, Sowerbj. The 

 specimens from the Tawi-Tawi group are small, like Bornean 

 examples, and all of them, with one exception which is 

 uniformly yellow, have a white band beneath the suture. A 

 similar style of coloration occurs in some of the Zebu speci- 

 mens oi polita. The opercula of both forms are similar in 

 colour and sculpture. 



24. Helicina lazariiSj Sowerby. 



Helicina lazants, Sow. Tbe?. Concb. i. p. 11, pi. ii. fig. 91, vol. iii. 

 p. 295, pi. cclxxviii. figs. 444, 445 ; Coiicb. Icon. figs. 208 a, h ; 

 Pfeiffer, Concb.-Cab. p. 58, pi. vii. figs. 18, 19. 



Hob. Bongao and Sibutu. 



All the examples from the above localities are coated with 

 earth, which at the periphery forms an acute jagged keel. 

 No mention is made by Sowerby or Pfeiffer of this charac- 

 teristic; but in the type specimens from Luzon, which 

 have been cleaned, traces of earth are visible. H. cyrtopoma 

 of Mollendoi-ff and a few other species have a similar habit of 

 agglutinating earth to the surface of their shells. 



25. Helicina contermina (Semper) , Kobelt. 

 (PL IV. figs. 6, 6 a.) 



HeUcinn contermina, Kobelt, Seniper's Reisen im Arcb. rbilippinen, 

 Landdeckelscbuecken, p. 76, pi. vii. fig. 32. 



Hah. Sibutu and Bilatan. 



The majority of the specimens collected by Mr. Everett 

 were obtained at Sibutu, only six examples coming from 

 Bilatan. The colour of this species is variable. It may be 

 uniformly lemon-yellow or pinkish red, with the exception of 

 the keel which is whitish, and a narrow reddish or brown 

 zone beneath the carina occurs in many specimens. 



