220 



of an inch. The markings, also, vary constantly, and the ani- 

 mals present much more striking characters of dissimilarity than 

 the shells. 



5. A. succiNCTA. A. testa obeso-conica, tenui, nitente, cor- 

 nea ad longit. striata ; anfr. 7, plane convexis, superne sub- 

 rugosis, non marginatis ; sutura leviter impressa ; apertura lale- 

 ovata, ; columella profunde excavata, brevi, in dentem latum 

 plicatum terminante ; labro simplici, intus sub-incrassato ; anfr. 

 ultimo interdum fascia media lata, obsoleta ; albida, aut linea 

 exigua suturali revolvente ejusdem coloris. Long. ^§ ; lat. 

 1 1 poll. Hab. Ewa, Oahu. 



Shell obesely conoid, thin, shining corneous, longitudinally 

 striate ; whorls seven, flatly convex, slightly rugose above, not 

 margined ; suture but slightly impressed ; aperture broadly ovate ; 

 columella deeply excavated, short, terminating in a broad plicate 

 tooth ; lip simple, slightly thickened within, with or without a 

 broad obsolete white central band on the last whorl, or a fine 

 revolving sutural line of the same color. 



Dr. Kneeland read a paper on the Sterility of many of 

 the varieties of the Domestic Fowl, and of Hybrid Races 

 generally, as follows : — 



The strange mania which has of late years manifested itself 

 for unnatural crosses in birds and quadrupeds, might, if properly 

 investigated, and with an eye to science rather than to gain, lead 

 to many interesting facts bearing upon Hybridity. I do not 

 refer to the impositions passed upon a public always ready to be 

 cheated, but to the real, bond Jide crossings of allied and remote 

 species. 



There was a time when most Naturalists believed that all our 

 varieties of domestic stock, as of cattle, sheep, goats, dogs, fowls, 

 &c., were derived, each genus respectively, from a single wild 

 original ; and that man's care, or rather his abuse, had obtained 

 from this the numerous existing varieties. In the present state of 

 our knowledge, we think we are justified in saying that the 

 varieties of cattle, of the dog, &c., have been produced by the 

 crossing, natural and forced, of several more or less nearly allied 



