OF CONCHOLOGY. 131 



'>Pterocera [Heptadactylus), Morch, op. cit. p. 60. (Not de- 

 scribed.) 



"^Hm-pago {Millipes),* H. and A. Adams, Gen. Moll, i, 1858, 

 p. 261. 



"^Harpago [Heptadactglus),^ 11. and A. Adams, op. cit. p. 261. 



^Pterocera [Pterocera), Gabb, Am. Jour. Conch, iv, 1868, p. 

 139. 



Strombus, sp. Linn, et al. 



Jjambis, sp. Bolten. 



Pterocera {Millipes), sp. Gabb. 



^7?maZ stromboid; radula (>S'. lambis, bryonia) with the rJiachi- 

 dian teeth two and a half to three times as wide as long, some- 

 what narrowed towards base, with a large convex median tooth, 

 and two or three smaller on each side ; inner plate oblong 

 rhomboidal, with a heel developed on the inner part of the basal 

 border, and a process near the base and from the external edge ; 

 cutting margin with a large inner pointed tooth and three or four 

 smaller ones ; lateral plates very long, narrow and curved, 

 armed on the anterior margin near the point with from three 

 to six teeth ; outer lateral plate broader at base than inner. 

 (Troschel.)t 



Shell obconoid, with the spire moderately elevated, the canal 

 produced into a long involute digitation, tortuous and inclined 

 towards the right, the labrum much alated and produced into 

 spiniform digitations, and with the sinus deep and entirely 

 lateral. I Whorls concave between the angle and the suture, 

 coarsely spirally striated, and with six§ more or less developed 

 primary fascioles, emitting as many involute primary digitations, 

 of which the sutural or posterior is accurabent on the spire and 

 continued backwards from the apex, three radiate from and near 

 the angle, and two are between the latter and the sinus ; second- 

 ary fascioles and spines are, in some species, interposed between 

 the primary ; antesinual lobe unarmed. Aperture linear, con- 

 tinued to the posterior boundary of the whorl. 



* The Messrs. Adams called these subgenera, but they always employ 

 their subgenera in a generic sense. 



t Dr. Troschel refers to a figure of P. lambis, but the one cited repre- 

 sents Jj^oj-r/iais, under which reference is again made to the same figure. 



J The "entirely lateral" sinus contrasts with the anterior position 

 characteristic of the genus Euprotomus [St. auri's-diance, etc.), in which 

 the expansion of the lip and deflection of the anterior portion of the 

 shell and revolving striae throw it entirely forwards. 



§ The exceptional number of seven is developed in P. violacea. 



