From Philippines and Papua New Guinea. From 20~100m. C. blanfordianus resembles C. collisus, C. spectrum, and C. jickelii. The latter species has a more conical last whorl (PMD 0.83-0.89) and its aperture is narrower, of more uniform width. The holotype of C. blanfordianus is lost. The specimen figured by Coomans et al. (1982) does not appear to be conspecific with the specimen depicted by Crosse.

Two groups of shells correspond to Crosse’s original figure: Moderately small and light shells from Papua New Guinea and Philippines and medium sized shells with darker and coarser pattern from Philippines. Which of these forms is more similar to the type of C. blanfordianus cannot be unequivocally decided by the original figure. It is uncertain as well, whether both forms belong to the same species or not. The smaller shells are in better accordance with Crosse’s original description; therefore, we assign the larger shells only provisionally to C. blanfordianus. The latter shells are very similar to C. zapatosensis.

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