Cirsochilus priscus
Cirsochilus priscus is an extinct species of sea snail, a marine gastropod mollusc, in the family Colloniidae. Fossils of the species date to early Miocene strata of the west coast of the Auckland Region.
Description
In the original description, Powell described the species as follows:The holotype of the species measures in length and has a diameter of. The species can be differentiated from Risellopsis varia due to the presence of more strongly and evenly developed tricarinate keels, a more concave umbilical depression on the base sculpture, and a strong callus projection found on the outer reflexed edge of the inner-lip.
Taxonomy
The species was first described by A. W. B. Powell in 1935, using the name Risellopsis prisca. In 1990, the species was recombined as Cirsochilus priscus by A. G. Beu and P. A. Maxwell in 1990. This, or its alternative representation Cirsochilus priscus, are the currently accepted names for the species.The holotype was collected at an unknown date prior to 1935 from southern Maukatia Bay near Muriwai, Auckland Region, and is held in the collections of Auckland War Memorial Museum.