ANOMA. 3 



mesocones and 5 to 8 on the ectocones of the lateral teeth. 

 The latter are of about the same size out to the 28th, so that 

 there are evidently many teeth in a transverse row. Unfor- 

 tunately, the radulas obtained from dry museum specimens 

 were very imperfect. Fischer's figures of the teeth of A. 

 maugeri give no idea of the actual structure; but Morse cor- 

 rectly saw the main characters in A. nigrescens quadricolor. 



The 'genus Anoma is very closely related to Spirostemma, 

 its brilliant gloss and bright coloring being consequent upon 

 the assumption of arboreal habits, as usual in the land snails. 

 Otherwise it differs in little but the discontinuous peristome 

 and swollen shape. The species have been distributed by 

 Pfeiffer in two genera, grouped with various forms of Uro- 

 coptis, which resemble them superficially. Von Martens 

 placed the species in the sections Anoma and Lia, which he 

 considered to belong to the genus Macroceramus. They were 

 first dissociated from Cuban and other unrelated species by 

 Fischer, in 1870 (J. de C., p. 20). 



The study of the species of Anoma is very complex, and de- 

 mands much more investigation in the field. Prof. C. B. 

 Adams recognized two species, gossei and maugeri, describing 

 twenty-four varieties of the latter, arranged thus : 



" a. Dark-colored varieties. In this group the dark colors 

 fade to a pale brown or cinnamon color. Var. nigrescens, 

 solida, levis, tricolor. 



b. Light-colored fasciate varieties, not distinctly striated 

 above the middle whorls. In this group pale yellow fades 

 into a dingy or pearl-white, or is replaced by pearl-white in 

 fresh shells. Var. crassa, unicincta, bicincta, concinna, sin- 

 uata. 



c. Light-colored varieties, not fasciate, and not distinctly 

 striated above the middle whorls. Changes of color the same 

 as in the preceding group. Var. rufilabris, citrina, fusiform!*, 

 albida, valida, unicolor. 



d. Strongly striated varieties, light-colored, not fascinlc. 

 Var. striatida, striata, corpulenta, fusca, conica. 



e. Tesselated varieties. Var. tesselata, cinerca. 



f. Aberrant, slender forms. Var. gracilis, Integra." 



