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



Type Locality: From ledge off Point Pinos, Monterey 

 Bay, California; depth "probably 200 feet"; H. Heath, sum- 

 mer, 1904; 1 specimen. 



Remarks : This small species possesses no very remarkable 

 characters of its own, except the presence of the conspicuous 

 groups of sutural spines on the girdle. It is undoubtedly 

 nearest to the circumpolar H. haideyi (Bean 1844), from 

 which the sutural spines and more sparse granulation (cf. 

 Pilsbry, '92, pi. 3, f. 72) are here relied upon to distinguish 

 it. The girdle also appears notably wider in proportion to 

 the width of the valves, upon which it somewhat encroaches 

 at the sutures. The specimen is quite likely not mature, so 

 it is uncertain just how much value should be reposed in the 

 features outlined. Eventually H. spicata may prove only a 

 variant of the older species, but the balance of evidence at 

 the present time appears to me in favor of its distinctness. 



The species itself is not of so great interest as the fact 

 that it for the first time establishes the genus Hanleya in 

 Pacific waters. Thiele, however, ( :09, p. 15) has reported 

 a specimen of H. hanlevi from Plover Bay, Siberia (Bering 

 Sea). 



Genus Mopalia Gray 1847 

 Mopalia phorminx Berry, 1919 



Pis. 3-5 



Diagnosis: Shell small, elongate-oval, only moderately 

 elevated; dorsal ridge carinate; side slopes straight. Entire 

 surface finely granulose. 



Anterior valve with 8 radiating series of coarse, closely 

 placed, downwardly directed, almost overlapping, pointed 

 pustules, 9-10 in a series, one or rarely two series of smaller 

 and more widely separated but otherwise similar granules 

 occurring in alternation; in addition to above, each posterior 

 margin dentated by a series of larger, more elongate, back- 

 wardly directed tubercles, so that including these the number 

 of primary radial series is 10; between the posterior series 

 and the next of the primary series in front are three of the 

 secondary series above noted, the median of Avhich is com- 

 posed of larger tubercles than the other two. 



