18 



A REVIEW OF THE VOLUTIDAE 



Volutosplna aplnosus (Llnne) 1758 

 (Plate 14, Figure 106) 



Conus spinosus Llnneus, Systema Naturae, 



10th Ed., p. 715, 1758. 

 Volutosplna spinosus, R. B. Newton, 



P.M.S.L., vol. 7, p. 105, 1906. 



Alt. 40 mm. 



Distribution in time: Cretaceous (Turonian)? 



Genus IREDALINA Plnlay I926 



Iredalina, Finlay, I926, Proc. Mai. Soc. 

 London, vol. 17, P> 59. 



Genotype: iredaltna mirabil is Finlay. 



Range: Off New Zealand. 



Prior to the discovery of the genus 

 Bathyaurlnia Clench and Aguayo, this ap- 

 peared to be the first Volute known with- 

 out even rudimentary vestiges of pillar 

 plaits. Like Tractolira sparta Dall, it is 

 a degenerate, abyssal form. Aside from the 

 American forms, which show little real re- 

 lationship, the likeliest allies are the 

 two isolated genera, Provocator, (which is 

 now by some authors considered Pachymelon) 

 and Gulvlllea, both of Watson. The nucleus 

 of Iredaltna is too worn to be defined with 

 certainty. 



Iredalina mirabilis Finlay I926 

 (Plate 15, Figure 92) 



Iredalina mirabtlts Finlay: Proc. Mai. 

 Soc. London, vol. 17, p. 59, figs, on 

 p. 60, 1926. 



Alt. 140, diam. 48 mm. 



Hab. Off Otago Heads, South Island of 



New Zealand. Single example in 40 fms. 



Holotype in the Finlay collection. 



Surface of shell smooth and pol- 

 ished, light; nucleus consisting of three 

 whorls; no sculpture apparent anywhere; 

 shell coated with a thin glossy callus, 

 extending over the whole spire; post- 

 nuclear whorls six, slightly convex; col- 

 umella long and straight, slightly oblique. 



Genus PHENACOPTYGMA Dall I918 



Phenacoptytma Dall: Proc. Bio. Soc. Wash- 

 ington, vol. 51, p. 138 (Nov. 29, 1918) 

 (no description). Oldroyd: Marine 

 Shells of the West Coast of North Ameri- 

 ca, Stan. Univ. Publ., Geo. Sci., vol. 

 2, pt. 1, p. 168. 



Genotype: Phenacoptyima cortezi Dall, 



Range: Off California in deep water south- 

 ward to Gulf of Panama. 



Shell fusiform, with transverse 

 and axial sculpture, elongated canal and 

 apparently simple pillar; the axis in the 

 upper whorls with two well-marked plica- 

 tions. 



This shell has the appearance of a 

 Turrld, with the whorls constricted and 

 appressed near the suture and a feeble in- 

 curvation of the margin of the lip at the 

 constriction. By grinding away a portion 

 of the apical whorls it was revealed that 

 the axis is furnished with plications which 

 extend to the beginning of the penultimate 

 whorl (Dall). 



Thiele apparently was the first 

 writer to associate this with the plait- 

 lacking genera of the Volutidae, which evi- 

 dently is the correct position. 



Phenacoptygma cortezi (Dall) 1908 

 (Plate 25, Figure 174) 



Daphnella { Surculina) cortezi Dall, Bull. 

 Mus. Comp. Zool. Harvard College, vol. 

 43, no. 6, p. 292, 1908. 



Alt. 39-43 mm. (decollate four and one- 

 half whorled); diam. about l4 mm. 



Hab. D.S.S. "Albatross," station 2919, 

 off Cortez Bank, in 984 fathoms, mud, 

 bottom temperature 38°F. U.S.N.M. 110, 

 613. Also off San Diego, California at 

 station 4353, in 639 fathoms, mud, bot- 

 tom temperature 39°. 



Shell slender, chestnut brown fad- 

 ing to white or yellowish, fusiform, the 

 spire shorter than the aperture, with more 

 than five whorls; nucleus defective; some- 

 what constricted over the anal fasciole 

 with an appressed suture, periphery 



