168 University of California Publications in Geology [Vol.11 



N. recluziana imperforata Stearns. Besides these two, there are a 

 number of others that might be equally well described. 



The specimens of N. recluziana from the Agasoma gravidum beds 

 apparently show as much variation as those of the Recent. Nearly 

 all the Recent varieties are found in these beds, as well as several 

 forms which have not been found in the Recent. For example, there 

 is one variety, the shell of which is apparently lower than any of the 

 Recent forms, and another, the body of which is more rounded than 

 that of any of the Recent varieties. Neither of these has been de- 

 scribed, as they apparently grade into typical forms. One of the 

 species described in this paper, which is considered as a variety of 

 N. recluziana, is JV. recluziana andersoni. 



NATICA (NEVEEITA) RECLUZIANA ANDERSONI, n.var. 



Plate 20, figures 3, 10, 11 and 12 



Type specimen 11212, Coll. Invert. Palae. Univ. Calif., loc. 1131 



? Natica inezana Conrad, Pacific Railroad Rep., vol. 7, p. 195, pi. 10, figs. 

 5, 6, 18.37. 



Neverita callosa Anderson and Martin; not Natica callosa Gabb, Proc. 

 Calif. Acad. Sci., ser. 4, vol. 4, p. 43, 1914. 



Shell fairly large for this genus, somewhat variable in outline ; spire low ; 

 apex acute. Number of whorls to spire five or six ; sutures rather strongly 

 appressed. Body whorl over three-fourths the height of the shell, with sides 

 somewhat flattened and usually with an indistinct shoulder a little below the 

 suture, giving to that portion of the shell a broadly subtabulate appearance ; base 

 rather broad; aperture ovate; inner lip and posterior part of base covered by a 

 broad callus, usually with a well-marked groove anterior to the middle and extend- 

 ing from the outer edge of the callus toward and almost at right angles to the 

 inner lip. The callus is very similar to that seen on N. recluziana Petit, of which 

 this form is described as a subspecies, and is just as variable; on some specimens 

 the umbilicus is open anterior to the callus, while on others the callus covers the 

 entire umbilical area. 



Dimensions. — Type specimen: height, about 32 mm.; height of body whorl, 

 27 mm. ; maximum width of body whorl, 33.5 mm. Paratype : height, about 39 

 mm. ; height of body wdiorl, 34 mm. ; maximum width of body whorl, 41 mm. 



Occurrence. — Type found in the Agasoma gravidum beds, University of Cali- 

 fornia locality 1131; paratype from east of Bakersfield in the Temblor (Middle 

 Miocene), University of California locality 2715, in a collection made by Clarence 

 Moody; here it is very abundant. This form is also found in the collections 

 of the Unversity of California as follows: from the Santa Margarita (Upper 

 Miocene), Clark, University of California locality 2283, in the Lower Fernando 

 (Pliocene), English, University of California locality 1735, and in the type 

 section of the Vaqueros (Lower Miocene), Vaqueros Valley, Monterey County, 

 California. 



Named in honor of F. M. Anderson, formerly Curator of Palaeontology in the 

 California Academy of Sciences at San Francisco. 



