Rahula raricostulata (E. A. Smith, 1893) Figure 44B

Sitala raricostulata E. A. Smith, 1893: 342-343, pl. 25, fig. 2.

Type locality.

"Busau or Busan, Sarawak" [= Jambusan Hills, Bau, Sarawak].

Material examined.

Gunung Doya: ME 8937, ME 8962. Gunung Kapor: ME 0860, ME 1508, ME 9097, ME 9207. Lobang Angin: ME 8938, ME 9221. Gunung Batu: ME 1891.

Distribution in Borneo.

Sarawak: Kuching and Serian divisions. Endemic to Borneo.

Remarks.

Only dry shells were found during the surveys. It differs from Rahula delopleura Vermeulen, Liew & Schilthuizen, 2015, by having a shell with distinct, prominent spiral lirae on the protoconch.