Land- Shells of the Sulu Archipelago. 55 



Semper*, is considerably like tliis species in form and colour, 

 but is less glossy, and the columella is more oblique, so that 

 it passes more f^radually into the curve of the peristome. In 

 C. mjrota, being more upright, it forms a distinct but rounded 

 angle at the base. In the latter species also it is a trifle less 

 widely expanded above, and has perhaps a straighter and more 

 even edge than that of C. magtanensis. The surface of that 

 species is dull above and only glossy upon the central portion 

 of the base. C. Broderipii^ Pfi*'t> is also an allied form. 

 The latter appears quite distinct from the C. Broderipii as 

 figured by Eeeve (Conch. Icon. fig. 88), which can scarcely 

 be the //. dealhata of Broderip, as he supposed. 



The description given above is taken from the Sibutu 

 specimens, which are all smaller than the type from Mindoro 

 figured by Reeve. The Mindoro shell is rather more solid 

 and consequently less pellucid and not so glossy as those from 

 Sibutu, the latter feature being maintained in the other 

 Philippine examples examined. 



11. Cochlosiyla {Ilypselostyla) boholensis, Broderip. 

 Bulhrnis boholetms, Reeve, Conch. Icon. pi. \-iii. fig's. 37 a, b. 



Hah. Bilatan. 



About two dozen specimens of this species from Bilatan do 

 not appear separable from this Philippine (Bohol) species. 

 Some of them are almost entirely without the undulating- 

 markings, but others have more or less of this ornamentation. 

 C. camelopardaWs, Brod., appears to be a form of this species. 



12. Amphidromibs macidiferus^ var. 

 (PI. IV. figs. 9, 9 a.) 



BtUimus macuUfo'us, Sowerby, Reeve, Conch. Icon. figs. 2G «, 6 ; 

 Pfeiffer, Conch.-Cab. ed. 2, pi. xxxvi. figs. 1, 2, pi. xl. tig. 9, var. ; 

 Hidalgo, Joum. de Conch. 1888, p. 31, pi. vi. fig. 1. 



Ilab. Bilatan Island. 



The specimens from Bilatan present but the faintest trace 

 of oblique strigation, like some of the Philippine examples. 

 They more resemble the variety figured by Hidalgo, being 

 either pale lemon-yellow or pinkish white. They are rather 

 smaller than normal specimens, having an average length of 

 about 50 to 55 millim. All as yet examined are sinistral. 



• ' Reisen im Arch. Philippineu,' Land-MoU. p. 170, pi. x. figs. 11 a, b. 

 t The dimensions given by Pl'eiffer of this species do not accord with 

 his figure. 



