NO. 2134. NOTES ON CHRYSODOMUS—DALL. 217 



small, generally with the apical whorl inflated, the next succeeding 

 somewhat constricted, and the rest regularly increasing; but the 

 nucleus varies as previously described from inflated and irregular to 

 blunt and regularly coiled, but always smooth. 



Type. — Murex islandicus Gmelin. 



It is questionable whether the small form named by Gould Fvsus 

 pygmaeus should be separated sectionally from Coins proper, or 

 not. The characters of radula and periostracum upon which Verrill 

 based his Neptunella are common to species of larger growth which 

 one would not think of separating. The nucleus, however, is pecu- 

 liar in being strongly spirally keeled clear up to the minute apical 

 cell, thus tabulating the nuclear whorls. The summit, however, is 

 not flat, and there are no such radial riblets as are found in Siphon- 

 orchis. Sipho parvus Verrill, a still smaller and similar species as 

 far as adult characters go, has the nucleus Chrysodomoid, though on 

 a smaller scale. 



Another group of species, typified by Fusus spitzhergensis Reeve, 

 has a special aspect due to the short canal and the prominence of the 

 spiral ribs separated by chaneled interspaces. It may be called 

 Aulacb fusus. 



Subgenus Latisipho Dall. 



? Parvisipho Cossmann, (part) Cat. Eocene bas. Paris, vol. 4, 1889, p. 147. 

 Eocene of Paris basin. Type, Fusus terebralis Lamarck (not Gould). 



Shell of moderate size, Buccinoid in form, with fine spiral stria - 

 tion or none; no axial sculpture; the periostracum persistent, 

 smooth ; the spire short, about equal to the aperture ; the canal short, 

 markedly recurved; the outer lip ample, simple, slightly reflected 

 in the adult; the body and pillar callous, smooth; the siphonal 

 fasciole strong with no chink between it and the columellar callus. 

 Operculum as in Colus with apical nucleus. The nuclear whorls as 

 in Colus but small. 



Type. — Chrysodomus hypolispus Dall, 1891, U. S. Nat. Mus., No. 

 122606. Bering Sea. 



The group of fossil species, included under Parvisipho by its 

 author, from the present writer's point of view appears heterogene- 

 ous, including smooth, plicate, and varicose species, some with inter- 

 nal lirae in the aperture. P. terehralis Lamarck seems from the 

 figure somewhat like the present group in outline, but, considering 

 its geological remoteness, the boreal habit and buccinoid aspect of 

 the group here assembled under Latisipho^ it seems that a separa- 

 tion is not unreasonable. The features in Parvisipho upon which 

 M. Cossmann lays special stress, such as the pillar without callus, 

 the absence of a siphonal fasciole (bourrelet), etc., are quite the 



