8 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



(I have seen no specimens to accord with it) differs too 

 markedly to render such a disposition satisfactory, even if 

 we accept the specimens mentioned by him as a variegated 

 variety of nexus (cf. Pilsbry, '92, p. 11) as surely conspecific 

 with the type. Recently the receipt from Dr. W. A. Hilton 

 of Pomona College of a specimen dredged by him in 10 

 fathoms, off Laguna Beach, California [S. S. B. 404], which 

 agrees very fairly with Carpenter's description of his "var- 

 iety", confirms the separate identity of the Monterey species, 

 although it evidently belongs to the same section of the genus. 



L. heathi is particularly marked by its elevated, roundly 

 Gothic-arched outline, poorly delimited lateral areas, steep 

 slope back of the projecting mucro, and minute girdle scales. 



The specific name selected is in honor of Dr. Harold 

 Heath, who collected the type. 



Genus Hanleya Gray 1857 

 Hanleya spicata, new species 



PL 1, fig. 3 



Diagnosis: Shell small, oblong, rather elongate, lateral 

 outline nearly straight. 



Valves sharply beaked; lateral areas distinct, but not con- 

 spicuous except by transmitted light, not ridged or grooved. 

 Sculpture consisting of numerous rounded tubercles (trans- 

 parent by transmitted light) irregularly scattered over the 

 lateral areas, but over the central areas slightly smaller and 

 disposed in 14-16 ill-defined, slightly oblique, longitudinal 

 series, most crowded and irregular near the jugum. Head 

 valve sculptured like the lateral areas. Tail valve with mucro 

 somewhat in front of the middle, elevated. 



Girdle of moderate width, beset dorsally with numerous, 

 faintly striate, glassy spicules of three main types : 1 ) very 

 small, ovoid, pointed spinelets, forming a rather loose cover- 

 ing over the entire girdle, these being plainly striate near their 

 apices; 2) elongate, dagger-like, marginal spinelets; and 

 3) a few scattered, needle-like spines, often over twice the 

 length of the marginal spicules, some of these distributed 

 here and there over the general surface of the girdle, but the 

 greater proportion occurring in loose groups of 5-8 at each 



