4° Bulletin 29 204 



coronate; whorls about thirteen, the nuclear smooth; the first 

 eight post-nuclear ornamented by a row of many close- set 

 tubercles near the base of each volution and, posterior to the 

 tubercles, by several incised spiral lines, the tubercles become ob- 

 solete rather suddenly on the third volution from the last, but 

 the spirals continue, becoming fainter until they fade out com- 

 pletely on the last whorl; body whorl with a roundly angulated 

 shoulder whence it tapers to the base, marked by fine arcuate 

 growth lines with occasional coarser resting stages; spiral sculp- 

 ture of coarse, slightly granular threads strongest anteriorly, ob- 

 solete posteriorly; aperture narrow, outer lip when complete 

 notched at the summit, then swinging forward in a broad curve, 

 retracted at the base, length of shell, 55, greatest width 24 mm. 



Dr. Dall has very kindly examined this cone and pronouced 

 it near Guppy's C. granozonatus. 



Localities. — (Exp'd '16) Bluff 1, Cercado de Mao; Zones 

 A and G, Rio Gurabo, near Los Ouemados. 



Conns gracilis simus Guppy 

 Plate 6, Figure 8 



Conus gracilissimus Guppy, Ouart. Jour. Geol. Soc. London, vol. 22, 



p. 288, pi. 16, fig. 4, 1866. 

 Conus Orbignyi Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 230, 1873. 



Not C. Orbignyi Audouin 1830. 

 Conus gracilissi7mis Guppy, Quart. Jour. Geol. Soc. London, vol. 32, 



p. 527, 1876. 

 Conus gracilissimus Dall, Trans. Wagner Inst. vol. 3, pt. 6, p. 1583. 

 Conus gracilissimus Cossmann, Journ. de Conchyliologie, vol. 61, pi. 

 4, fig. 13, 1913. 



The three Cones, C. gracilissimus , granozonatus and conso- 

 brinus, are very closely related; and various authors have placed 

 one or the other in synonymy. This is but one case of the in- 

 tergradation of forms which is highly characteristic of the Do- 

 minican shells. One must either run very dissimilar forms to- 

 gether, as did Gabb, or to some extent ignore connecting links. 



C. gracilissimus is widely distributed. Guppy found it at 



