^°189L^'] PR0CEE13INGS OF THE NATIONAL MUSEUM. 177 



This is the form which has, especially iu large worn specimeus from 

 the Keys, been most frequently mistaken for E. tnuriciformis, the young 

 of which it somewhat resembles. 



Nassa californiana Conrad. 



Schizopyga caUforniana Courad, Proc. Acad. Nat. Sci. Phila., 1856 (Dec), p. 315; Pa- 

 cific R. R. Reports, vol. vi, p. 6i), PI. 2, Fig. 1, 1857 ; Cpr. Suppl. Rep. Br. Ahsoc, 

 1833, p. 593. 



N\<s8a (Caesia) fossata Gabb, Pal. Cal., ii, pp. 47, 74, 1839; ex parte, not of Gould. 



Schizopyga calif ornica Gabb, op, cit., p. 74, in synonymy; not of Conrad. 



Miocene of Santa Clara County, California ; Conrad. Dead Man's 

 Island, near Long Beach, California; Miss S. P. Monks, Hon. Delos 

 Arnold, and Mrs. M. Burton Williamson. Recent on the coast of Cal- 

 ifornia from Drake's Bay to Cerros Island, in 25-65 fms. U. S. Fish Com. 



This is a typical Nassa, of the evenly reticulate kind, and doubtless 

 the ancestor of N. fossata Gould, from which it differs by its more 

 slender and cylindric form, its more evenly reticulate sculpture, and 

 its less pronounced varix at maturity. It has much the sculpture and 

 general form of N, per ping uis, with the size and strength of N. fossata, 

 with the latter of which it has been injudiciously united by Gabb." 

 The "genus" Schizo2)i/ga -was based on the postsiphonal sulcus com- 

 mon to all species of Nassa and described from an imperfect and muti- 

 lated specimen. It has of course no claims to present coasideration. 



Pusus Kobelti Dall. 



(Plate VI, Fig. 4.) 



Ftisus Eoheiti Dall, On the California species of Fusus, Proc. Cal. Acad. Sci., Mar., 

 1877. Extra copies Mar. 19, 1877. 



Habitat: Monterey to San Diego, California; off" Catalina Island, 

 in IG fathoms ; U. S. Fish Commission. 



Shell elegantly and regularly fusiform, of seven or eight whorls, 

 sculptured with revolving lines and transverse costai. In young speci- 

 meus the whorls are somewhat rounded, in the adult elongated. Ei)i- 

 dermis in perfect specimens dark ashy or greenish olivaceous, rising in 

 crowded lamellre and obscuring the coloration. This varies, howev^er, 

 with age and habitat. Apex acute, the second and third whorls hardly 

 larger than the embryo. Color whitish, the alternate revolving ridges 

 of a dark brown, which occasionally extends to all the ridges. These 

 ridges do not lose their color in passing over the costtie, except where 

 worn off by rolling on the beach. Except on the earlier whorls the 

 ridges do not show any tendency to enlarge in i)assing over the costte. 

 On the posterior edge of the whorls the shell is appressed on the su- 

 ture, and the ridges here are inconspicuous in most specimens, com- 

 pared with those on the body of the whorl. These ridges, moreover, 

 bear the character of threads, the interspaces not being channeled, as 

 in F. Earfordi and hiteopictus. In the most perfect specimen, on the 

 Proc. ^^. M. 91 12 



