Bornean Species o^ Opisthostoma. 271 



5. Opisthostoma Hosei, Godwin- Austen. 



Opisthostoma Hosei, G.-A., Ann. & Mag. Nat. Hist. 1890, vol. vi. 

 p. 246, p]. vii. fig. 2. 



Hab. Baram district, North Sarawak. 



6. Opisthostoma mirabile, Smith. 



Opisthostoma mirabile, Smith, Journ. Linn. Soc., Zool. 1893, vol. xxiv. 

 p. 346, pi. xxv. figs. 11, 11 a ; id. Science Gossip, 1894, vol. i. p. 6 

 (cut). 



Hab. Goraanton Hill, North Borneo. 



7. Opisthostoma Everetti, Smith. 



Opisthostoma Everetti, Smith, Journ. Linn. Soc, Zool. 1893, vol. xxiv. 

 p. 346, pi. xxv. figs. 12, 12 a. 



Hab. Jambusan, south-west end of Sarawak. 



8. Opisthostoma jucundum, Smith. 

 Opisthostoma jucundum, Smith, op. cit. p. 347, pi. xxv. figs. 13, 13 a. 



Hab. Mantanani Island, off British North Borneo. 



9. Opisthostoma baritense, Smith. 

 Opisthostoma baritense, Smith, op. cit. p. 347, pi. xxv. figs. 15, 15 a. 

 Hab. Barit Mountain, North-west Borneo. 



10. Opisthostoma busanense, Smith. 

 Opisthostoma busanense, Smith, op. cit. p. 348, pi. xxv. figs. 16, 16 a. 

 Hab. Busan, south-west end of Sarawak. 



11. Opisthostoma otostoma } Boettger. 



Opisthostoma otostoma, Boettger, Nachrichtsbl. deutsch. nial. Gesell. 

 1893, p. 194. 



Hab. Brunei, North-west Borneo. 



12. Opisthostoma Gookei. 



Testa conica, perforata, pallide rufescens ; spira subtiliter concave 

 conica, ad apicem obtusiuscula ; anfractus 6-7, superiores convexi, 

 lseves, inferiores minus convexi, oblique et tenuissime lamellati, 

 ultimus ad peripheriam obtuse angulatus, antice constrictus, 

 retroversus, ascendens, conspicue solutus, lamellis validioribus 

 distantioribus bicristatis ornatus ; apertura rotundata, intus 



19* 



