188 CAMKOltMA ACADKMY OF SCn?NOEK 



Class GASl KOPODA; 

 Older OlMSTIIOHKANClllATA. 



Family XLl. ACT.KUMDyK. 



Genus Actaeon Mvniforl. 



Shell solid, ovate, with a conical, iiiany-whorled spire, spirally grooved or punctate-slriate; 

 aperture long, narrt>\v, rounded in front; outer lip sharp; columella with a strong, tortuous fold. 



Tornatella fasciata Lam. is a cliaracteiistic species. 

 144. Actaeon traskii Slearnn. 



Plate X, Fio. 6. 



Actao7i IraskiiST^hKHS, Nautilus, Vol. XI, 1897, p. 14; Proc. U. S. Nat. Mus., Vol. XXI, 1899, 

 p. 297, text-fig. 



Shell small, conical above, cylindrical, rather solid; sculpture consisting of numerous fine, 

 spiral, impressed lines, which become wider toward the base of the body-whorl, making the lower 

 portion of the shell Urate, and by sharp, close-set, incremental lines; these latter are subordinate to 

 the spiral sculpture; whorls si.x; suture distinct, narrowly channeled; aperture about two-thirds 

 length of the shell, acutely angular above, rounded and effuse below, finely Urate and glossy within, 

 with a thin glazing on the body-whorl; outer lip thin, simple; columella short and flexuous, with a 

 conspicuous fold cur\'ing around the same and thickening the edge of the lip, which is moderately 

 produced in the umbilical region. 



Dimensions. — Long. 10 mm.; lat. 5.2 mm.; body-whorl 8.3 mm. aperture 7 mm. 



Distinguishable from Rictaxis punciocalatn by its larger size, more impressed 

 suture, more c^dindrical body-wliorl, more prominent and effuse anterior plication. 

 Specimens identified by Dr. Dall. Rare in upj)er San Pedro series of San Pedro. 



Found in the Pleistocene at Spanish Biglit, from whicii locality it was 

 originally described. The specimen figured is from the upper San Pedro series at 

 San Pedro, and is now in the collection of Delos Arnold. 



? Living — San Diego (Stearns). 



Pleistocene. — San Pedro (Arnold): San Diego (Stearns; Hamlin; Arnold). 



Subgenus Rictaxis Dall. 



Shell like Aclaou, but with the columella jirojecting beyond the line of the anterior margin, 

 forming a small, tooth-like projection, or truncate obliquely. 



Type, Tornatella punctocalata Cpr. 



1 The claftRlricatioii of the Uastropoda Is that UHfd by DaU in Fartu 1 aad II or the " CoutributloDH to the Tertiary Fauna of 

 Florida." and in Bulletin No. 37. United States National Museum. The generic descriptions are for the most part from Tryon's "Struc* 

 tnral and Systematic Conchology." 



