Conus (Asprella) petricosus Azuma, sp. nov. (Conidae)
Shell large, thick, very solid, dull creamy in colour, without any colour pattern: periostracum dull yellowish, sublamellar; spire concavely elevated, containing nearly one-fifth in the shell length; whorls 12, the apex eroded, rather widely excavated, appressed at the suture, which is shortly overhanged by the shoulders of previous whorls, the last whorl obtusely angled above and rather convexly for a short distance. Incremental growth striae rather distinct and irregular, with very obscure
spiral striae; aperture rather wide, very irregularly parallel-sided, very narrow above and gradually wider below. Outer lip thick and dull, rather arcuated; columellar margin bearing a very strong subvertical, widely sigmoid fold; throat milky white in colour.
Radula is represented by only marginal teeth, each of which 0.5mm. long by 0.04mm. wide, its base has a small horn-like process; its middle part very slender; near the apex there are a minute barb on one side and on another side also a small barb (blade with barb). Length 80 mm., breadth 33.5mm., 12 whorls (figured type specimen).
Off Tosa, from a deep bottom, said to be about 200 fathoms, only the type specimen, collected by the author.
This species more or less looks like Conus (Endemoconus) sieboldi (Reeve), but differs in the following points: shell very solid, dull creamy without any colour pattern; aperture very irregularly parallel; 5th whorl to 8th whorl have distinct and regular incremental growth striae and radular characters, etc.