1911.] NATURAL SCIENCES OF PHILADELPHIA. 341 



ribs on each whorl, the threads obsolete on their summits. The 

 imperfect shell figured measures, length 9, diam. 2.8 mm., of 6^ whorls. 



OONID^J. 



Conus concavitectum n. sp. PI. XXIII, figs. 5, 6. 



A cone about twice as long as wide. Spire very concavely conic or 

 mucronate, the inner whorls forming a very steep, acute cone, its 

 whorls carmate below the middle of each, sloping and usually marked 

 with a faint impressed spiral line or two above the carina, or having 

 several striae on the lower part of the slope, where the carina lies in 

 the suture. The last 3 or 4 whorls revolve nearly in a plane, are 

 markedly concave, with the outer edge raised in an erect flange or 

 keel, the concavity marked with one or several spiral threads and 

 distinct, arched growth-stria?. Last whorl slightly convex below the 

 shoulder-angle, straight and slender below, marked below the middle 

 with unequal, low spirals, most of them beaded. Length 37.5, diam. 

 19 mm. Incomplete adult shells are much larger, diam. 28 mm., 

 with about 15 whorls. 



This species differs from C. domingensis Gabb by having the outer 

 edge of the later whorls raised in a flange and by the smooth, not 

 tuberculate early whorls. None of the larger specimens is complete. 



Conus haytensis Sowb. 



Conus haytensis Sowb., Journ. Geol. Soc. Lond., VI, p. 44. 



A perfect, but small specimen, length 26 mm., agrees with Santo* 

 Domingo examples. ' 



Conus domingensis Sowerby(?). 



C. domingensis Sowb., Journ. Geol. Soc. Lond., VI, p. 45. 

 A fragment, the spire only, agrees well with this species, so far as it 

 goes. 



Conus consobrinus Sowb. 



Conus consobrinus Sowb., Journ. Geol. Soc. Lond., VI, p. 45. 

 A Gatun specimen is about 30 mm. long, of the highly sculptured 

 typical form. 



Conus granozonatus Guppy. 



C. granozonatus Guppv, Quart. Journ. r Geol. Soc. Lond., XXII, p. 287, PI. 16, 



fig. 5. 

 C. gracilissimus Guppy, t. c, p. 28S, PI. 16, fig. 4. 



Not uncommon at Gatun. While closely related to C. consobrinus,. 

 this seems to be a distinct species. In our series from Bowden the 

 C. gracilissimus does not seem distinguishable specifically. 



