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The only specimen is a very young dead one, with rather smooth ribs, so I have applied 

 the name margaritaceus , as the specimen was too poor, to decide of it might belong to T 

 argyrostoinus Lin., now taken by most authors as a synonym or variety. 



9. Turbo (Sencctus) sp. 



Stat. 78. Lumu-Lumu-shoal, Borneo-bank. Shore. 3 Spec. 

 Stat. 213. South-island. Reef. 4 Spec. 



There are in the collection some small shells, belonging to the genus Turbo and probably 

 to the subgenus Sencctus, which are probably young, but I am unable to state, to which species 

 they belong. They are very diversified in colour, less so in sculpture, but agree in the white 

 operculum. I doubt that they belong to one and the same species. Those from Station 78 

 belong I think, to two species, those from the South-island to two or three. 



10. Turbo (Marmorostoma) porphyrites Martyn. 



Martvn. Universal Conchol., PI. 70. 



Reeve. Conch. Ie. Vol. IV, Turbo, fïg. 53, fig. 19 {versicolor). 

 KlENER. Coq. Viv. Turbo, p. 71, PI. 7, fig. 2, PI. 36, fig. 6. 

 TRYON. Man. of Conch. Vol. X, p. 215, PI. 50, fig. 58. 



Stat. 19. Bay of Labuan Tring, West coast of Lombok. 18 — 27 M. Coralsand. 5 Spec. 



Stat. 47. Bay of Bima near South fort. 55 M. Coralsand. 2 Spec. 



Stat. 50. Bay of Badjo, West coast of Flores. Up to 40 M. Sand. 4 Spec. 



Stat. 51. Madura-bay. Reef. 5 Spec. 



Stat. 86. Dongala; Palos-bay, Celebes. Reef. 1 Spec. 



Stat. 127. Taruna-bay, Great Sangir-island. 45 M. Sand. 2 Spec. 



The specimens vary much in colour, one from Madura-bay, one from Stat. 50 and 

 both from Stat. 127, are very dark, and approach, or may belong to var. lugubris Kiener 

 (l.c. PI. 28, fig. 2). Their operculum is also darker, than in more typical specimens. Many have 

 the orange-red bands. Two of the specimens from Stat. 50, agree very well with the figure of 

 T. mespilum in Fischer's Monograph (Coq. Viv. p. 73, PI. 35, fig. 2) but this name seems to 

 belong to another species or variety, not to be found in the "Siboga" collection. 



Most authors call T. versicolor Gmel. a synonym of T. porphyrites Martyn, though 

 Troschel observed differences in the radula-, as it is scarcely possible to make out, to which 

 forms his shells belonged, and Troschel has dissected only one specimen of T. porphyrites, 

 I have folio wed the first method. 



Guildfordia Gray. 



1 . Guildfordia yoca Jousseaume. 



Jousseau.me. Le Naturaliste 1899, p. 48. 



Stat. 251. 5°28'.5 S., i32°o'.S E. 204 M. Hard coralsand. 2 Spec. 

 Stat. 253. 5°48'.2 S... I32°I3'E. 304 M. Grey, hard clay. 1 Spec. 



Of the specimens from the first locality, one specimen is very young, its largest diameter, 



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