220 Kansas Academy of Science. 



Family LXI Muricid>b. Genus Monoceros Lamarck. 



"Shell ovate; last whorl large; spire rather elevated,; aperture 

 semilunar; inner lip wide and flattened; outer lip crenated, with a 

 prominent tooth usually at the fore part. Monoceros lugubre Sow. 

 is a characteristic species" (Arnold.) 



55. Monoceros engonatum Conrad. Plate VI, fig. 55. 



Monoceros engonatum Con., Jour. Phil. Acad. Sci., vol. VII, 1837, p. 264 

 pi. XX, fig. 17; (equals M. unicarinatum Reeve, Icon. Conch., Sp. I) 

 Cpr., Brit. Assn. Kept, 1893, p. 663. Gabb, Pal. Cal, vol. II, p. 75 

 1869. Tryon, Man. Conch., vol. II, p. 195, pi. LXI, fig. 304, 1880. Cooper 

 7th Ann. Kept. Cal. St. Min., 1888, p. 251. Keep, West Coast Shells, p 

 29, fig. 10, 1892. Williamson, Proc. U. S. Nat. Mus., vol. XV, 1892, p 

 214. Arnold, Mem. Cal. Acad. Sci., vol. Ill, pp. 246, 247, 1903. 



Arnold's description (see above): "Shell of medium size, fusi- 

 form ; whorls six, angular, flattened to concave above and below : 

 spirally sulcate, sulci with transverse lamellar strige ; suture deeply 

 appressed, distinct ; aperture subelliptical ; outer lip efiPuse, dentate 

 within ; inner lip slightly flattened, smooth ; canal deep, narrow, 

 recurved ; pillar twisted, squamose.'' 



Dimensions (specimen obtained much broken): Axial length, 

 more than 28 ; lat., 19 ; height of body whorl, including canal, 

 more than 21. 



A single specimen of this species was found in the Quillayute 

 formation. 



Living: San Diego to Baulinas Bay, California (Cooper). 



Pleistocene : San Pedro, Ventura, San Diego, Lake Merced, San 

 Mateo county, California (Arnold) : San Pedro, San Diego (Cooper ) . 



Pliocene : Old mouth of Maxfield creek, Quillayute, Wash. 

 ( Reagan). 



Genus Trophon Montfort. 



56. Trophon sp. Plate VI, fig. 56. 

 A fragment of a shell from the Quillayute formation proves to 

 be of the above genus; but it is too much broken to admit of spe- 

 cific determination. 



Subfamily Purpurin^; Genus Purpura Brugiere. 



Shell oblong-oval, body whorl large, usually with transverse ribs 

 or nodes; spire short in most species; aperture oval to ovate, large, 

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

 flattened, smooth. A typical species is Purpura persica Linne. 



