MAZATLAN UNIVALVES 401 



interstitiis latis, spiraliter vix striulatis, basi vix striatd ; 

 apertura subpyriforma ; labro acuto, secundum costas vix 

 sinuato : labio inconspicuo. 

 Mangelia acuticostata, Proc. Zool. Soc. June, 1856. 



Resembles M. neglecta, C. B. Ad. which, however is de- 

 scribed as having an elevated spiral line on the middle of the 

 whirls, and basal striae. Long. *138, long. spir. '074, lot. '07, 

 div. 35. 

 Hob. Mazatlan ; 1 sp. off Spondylus ; Lpool Col. 



Tablet 1914 contains the specimen. 



GENUS CITHAEA, Schum. 



Ess. no. 106, lS17. Wbodw. Man. p. 115. 



Cythara, H. fy A. Ad. Gen. vol. i. p. 98. 



Mangelia, Rve. Conch. Ic. (non Risso) maxima pars. 



474. ? CITHAEA , sp. ind. 



Tablet 1915 contains a broken shell with 7 long, straight, 

 sharp ribs and very crowded spiral striae ; mouth sublinear ; 

 labrum thickened, except at the notch. There is no trace of 

 teeth within. 

 Hob. Mazatlan ; 1 sp. off Spondylus ; Lpool Col. 



FAMILY CONID^E. 

 GENUS CONUS, Linn. 



The Mazatlan Gones do not appear to be rich either in 

 species or individuals ; nevertheless, if not valuable to collec- 

 tors, they were interesting through possession of the epidermis, 

 and often of the opercula. These are very small for the shell, 

 elongated and narrow ; with the apex terminal, usually decol- 

 lated, and often much broken. When repaired, as in other 

 families, it sometimes assumes the concentric type. 



475. CONUS EEGULAEIS, Sow. 



Conch. HI. pi. 29, f. 29, pi. 36, f. 45. Eve. Conch. Ic. pi. 26, 

 sp. 126. Lam. An. s. Vert. vol. xi. p. 132, no. 189. Kien* 

 Icon. Conch, p. 124, no. 103, pi. 23, f. 3, vr. Mke, in Zeit. 



