PROSOPEAS. 15 



Many of the descriptions do not mention the apical sculp- 

 ture, and frequently in the larger forms it cannot be made 

 out in adult shells owing to erosion ; so that at present these 

 characters cannot be utilized in the arrangement of the species. 

 Most of those known from Lombock, Java and Sumatra be- 

 long to the subgenus Paropeas, while further north Prosopeas 

 proper predominates. 



Opeas hedeius and 0. fagoti of Mabille, described from 

 Tonkin, may belong to Prosopeas, but they have not been 

 figured and their position is uncertain. 



Distribution of Species of Prosopeas. 



Philippine species : P. suturale, no. 1 ; P. cocldiodes, no. 2 ; 



P. rhodiniforme, no. 3; P. elongatulum, no. 4; P. 



pagoda, no. 5; P. quadrasi, no. 6; P. romblonicum, no. 



7; P. macilentum, no. 8. 

 Caroline Is. : P. carolinum, no. 9. 

 East Indian species: 



Moluccas: P. elongatulum, no. 4. 



Celebes : P. gorontalensis, no. 10. 



Lombock : P. lombockense, no. 12 ; P. discernibilis, no. 11. 



Java : P. achatinaceum, no. 13 ; P. acutissimum, no. 14 ; 



P. hochstetteri, no. 15 ; P. liolosericum, no. 16. 

 Sumatra (including Enganio) : P. liolosericum, no. 16; 



P. paioense, no. 18 ; P. laxispira, no. 19 ; P. argenteum, 



no. 17. 



Nicobar Is. : P. roepstorfi, no. 20 ; P. achates, no. 21. 

 Andaman Is. : P. haughtoni, no. 22 ; P. pealei, no. 23 ; P. 



tualkeri, no. 24. 

 Asiatic species, Malay Peninsula to Burma: P. walkeri, no. 



24; P. turricula, no. 25; P. terebralis, no. 26; P. tche- 



helense, no. 27 ; P. swettenhami, no. 28 ; P. hebes, no. 29. 

 Anam, Laos, Tonquin : P. anceyi, no. 30 ; P. henrici, no. 31. 

 Hainan: P. teres, no. 32. 

 China : P. decorticatum, no. 33 ; P. striatissimum, no. 34. 



1. P. SUTURALE Moellendorff. PI. 5, figs. 23, 24. 



Shell nearly subrimate, long-turrite, thin, glossy, corneous- 



