Land- Shells of the Sulu Archipelago. 57 



15. Cychtus hongaoensis. (PI. IV. figs. 8, 8 a.) 



Testa minima, late umbilicata, suborbicularis, sordido albida, ad 

 apicem purpurco-rubra. epidermide luteo-olivacca induta, plonira- 

 que limo tunicata : anfractus 3.^., perconvexi, sutura profunda 

 sejuncti, celoritcr crcsccntes, liris tonuissimis spiralibus ornati, 

 lineisque incrementi tenuibus sculpti, ultimus antico paulo desccn- 

 dcns et solutiis ; apcrtura circularis, parva ; peristoma simplex ; 

 operculum album, nucleo nigrescentc, Icviter coucavum, aufrac- 

 tibus angustis circiter 8 oblique striatis. 



Diam. maj. 5 millim., min. 4, alt. 3| ; apcrtura 2 lata. 



Hob. Bongao. 



In form this species resembles G. pusiUus, Sowerbj, a 

 Philippine form, and C. h'7iitus, Godwin-Austen, from 

 Borneo. It also agrees with the latter in the habit of coating- 

 its surface with earth. It is, however, a smaller species than 

 either, and differs from them in having spiral sculpture not 

 only upon the apical whorls but also upon the rest. The 

 mud- or earth-coating is produced into two keels, one around 

 the upper part of the body-whorl and the other below the 

 middle, giving it a quadrate appearance. 



16. Cyclophorus philippinarunij Sowerby, var. 



C'yclopJiorits jyhilippinarum, So^. Thesaurus, vol. i. p. 12o, pi. x.xix. 

 figs. 205-207 ; Reeve, Conch. Icon, figs. 64 o, 6; Kobelt, Semper 's 

 Reisen im Arch, rhilippinen, Landdeckelschneckeu, pi. iv. figs. 24, 25. 



Hah. Bongao and Sibutu. 



The shells from the above localities belong to that form 

 which has been named C. Sowerlyi by Hidalgo (Journ. de 

 Conch. 1888, p. 80). They include two varieties j the pale 

 form accords with Hidalgo's var. y, and the dark examples 

 correspond closely with his typical form. 



17. Alycceus excisus, Mollendoi'iF. 



AlyccBus excisns, MuUendorff, Jahi-buch deutsch. mal. Gesell. 1887, 

 p. 287. 



Hah. Bongao {^[Ollendorff). 



This species was not obtained by Mr. Everett. 



18. Leptopoma atricapillum, Sowerby. 



Cychstoma atricapiUutn, Sow. Thes. Couch, vol. i. p. 137, pi. xxx. 



figs. 230, 231. 

 Leptopoma atricaptillum, Reeve, Conch. Icon. figs. Qa, b; Kobelt in 



Semper's Reisen im Arch. Philippinen, pi. vii. figs. 6, 7. 



Hah. Bilatan, Bongao, and Sibutu. 



