1884.] OF THE 'CHALLENGER' EXPEDITION. 2G1 



12. Leptopoma melanostoma, Petit. 



Hab. Amboyna, Moluccas. 



Both the white- and black -lipped varieties were met with at the 

 above locality. This species is usually regarded as an Aruan shell, 

 so it is interesting to find it ranging further northward. Of the 

 eleven Amboynan specimens at hand, only two have a black peri- 

 stome, which may not, however, at all closely indicate the pro- 

 portional number existing in nature — indeed, may be altogether 

 misleading, for this variety may in truth predominate. 



13. Leptopoma vitreum, Lesson. 



Hab. Melanipa Island, Basilan Strait, Philippines. 



Of five specimens from this locality two are totally white, one 

 livid lilac, one faintly stained with brown, getting darker towards 

 the apex, and the remaining one coloured like the last but marked 

 in addition with several obliquely wavy pale brown lines. 



14. Helicina id^e, Pfeiffer. 

 Hab. Amboyna, Moluccas. 



15. Pythia scarab^eus, Linn. 



Hab. Amboyna, Moluccas ; Ke Dulan, Ke Islands ; Dobbo, Wo- 

 kan, and Wanumbai, Aru Islands. 



A series of about thirty specimens from Ke Dulan shows that 

 P. castanea, Reeve (non Lesson), is merely a variety of this species, 

 which is subject to variation in size and markings. They average 

 about 24 millim. in length and 14 millim. in width. 



P. pantherina, A. Adams, also appears to be a mere variety, pos- 

 sessing no distinctive features. In some stages of growth in certain 

 specimens the umbilicus is altogether closed, in others partly so, 

 whilst in large shells it is fairly wide and deep. 



16. Pythia wallacei, Pfeiffer (var.). 



Hab. Amboyna, Moluccas. 



The typical form of this species was described from specimens 

 collected by Mr. Wallace at Batchian, another of the Molucca 

 Islands. The Amboyna specimen obtained by the ' Challenger ' 

 differs in having the whorls of the spire rather more convex, and the 

 upper parietal denticle is not prolonged upwards quite so distinctly, 

 which, however, may be due to age, for it is not apparently full- 

 grown. In the British Museum there are four specimens from the 

 Aru Islands which are similarly abnormal with regard to this tooth, 

 in other respects corresponding very closely with the Batchian 

 shells. 



17. Melania sobria, Lea. 



Hab. Pasananca, near Zamboanga, island of Mindanao. 



The two specimens from the above locality belong to the same 

 type as those collected by Mr. Cuming on the island of Siquijor 

 (vide Reeve, Conch. Icon. f. 32). They are yellowish olive, with a 



