192 Kansas Academy of Science. 



its tabular area not being keeled and in its lack of sculpture. It 

 differs from C. giganteus (described later) in its smaller size and in 

 its not possessing the double tabular area and the keeled ridges 

 bordering the respective tabular areas. A single specimen was 

 obtained from the lower shales of the Oligocene-Miocene formation 

 near Gettysburg, Wash. 



Family LXI MURICID.^ ; Subfamily PURPURIN^; Genus PwrpMra Brugiere. 



Shell imperforate, oblong-oval, last whorl large with transverse 



ribs or nodes ; spire generally short ; aperture oval to ovate, large, 



terminating in a very short oblique channel, or notched; columella 



flattened, smooth ; outer lip simple. Purpura persica Linne is a 



characteristic species. 



27. Purpura canaliculata Ducal. Plate III, fig. 27. 



Purpura canaliculata Ducal, An. N. Sc, 1832, p. 104, pi. LI, fig. 1 (equals 

 P. lima Martyn), 



Shell small, semiglobular ; spire somewhat elevated ; whorls four ; 

 suture impressed distinct ; body whorl ventricose ; aperture ellipti- 

 cal, large; inner lip flattened ; canal short; outer lip thin; surface 

 ornamented with spiral ridges and fine incremental lines (mostly 

 worn o& the specimens at hand). 



Specimens of this species were found in the Gettysburg shale 

 of the Clallam formation, but were rather rare; in the Upper Plio- 

 cene of the Quillayute formation, however, they are abundant, 

 The specimens from the Clallam formation, however, have a larger 

 body whorl than the more recent specimens. 



This species is easily distinguishable from P. crispata by its 

 larger body whorl in proportion to its axial length, and also by its 

 smoother surface and by its smaller spire. 



Measurements of a specimen from the clay shales of the Clallam 

 formation of Gettysburg, Wash.: Axial length, 26; diam. 22; canal, 

 18x14. 



Living: Alaska to San Diego ■( Cooper) ; Neah Bay, Quillayute 

 Bay (Reagan). 



Pliocene: Santa Rosa, Kirker's Pass, San Fernando, Cal. 

 (Arnold); Quillayute, Wash. (Reagan); Queets, Wash. (Arnold). 



Post-Pliocene: Santa Barbara (Gabb). 



Oligocene-Miocene: Gettysburg, Wash. (Reagan). 



The specimen figured is from the Quillayute formation. 



Superfamily Cerithiacea; Family LXXVJI Naticid^. 

 Genus Polynices Montfort. 



All Naticida with corneous opercula. Natica mammilla is the 

 type. 



