116 K. J. Bush — Marine Gastropods referred to 



Ethalia A. Adams, 1853. Type, E. Guamense (Quoy and Gaimard). Is. of Guam, 

 and Philippines. 



" Shell orbicular, turbinately depressed ; whorls smooth or trans- 

 versely striated, convex, rounded at the periphery; umbilicus partly 

 closed by a callous deposit." P. Z. S., p. 189, 1853. 



This was constituted as a sub-genus of ITmbonium, for two spe- 

 cies of variously colored shells, M Guamense (Q. and G.) and M 

 striolatuyn A. Ad. (described), closely resembling that genus but 

 having the umbilicus only partially covered by a callous deposit. 

 Neither was mentioned as a type species. H. and A. Adams, in 

 1858 (Gen. Rec. Moll., p. 409), added to the description "columellar 

 lip ending anteriorly in an obtuse dilated callus," but cited the same 

 two species as the onl}^ known examples. 



P. P. Carpenter, in 1855-7 (Mazatlan Mollusca, p. 250), described 

 five new species of small shells which he referred to Ethalia with 

 some doubt ; for, although they had " the general aspect of Vitri- 

 nellcB they agreed with Globulus in having callous bases," but dif- 

 fered in having the callus " generally not covering the umbilicus." 



A. Adams, in 1861 (Ann. Mag. N. H., viii, p. 305), described three 

 new species as belonging to the genus Ethalia; but the first one E. 

 atomaria is described as a small, semi-transparent, white shell, with 

 the umbilical region entirely covered by a callus ; outer lip produced; 

 which shows it to be quite different from either of the two original 

 species and much nearer to Teinostoma politum A. Ad. or Pseudo- 

 rotella se')nistriata (d'Orb.) Fischer. 



These two instances will suffice to show the erroneous application 

 of the genus. Unfortunately, this has been adopted, apparently 

 without question, by more recent authors, so that a reconsideration 

 of the subject is necessary before the right relations of the numerous 

 species can be satisfactorily determined. 



Mr. Pilsbry (Manual, xi, p. 457) called attention to the confusion 

 into which the genus had been brought and gave Ethalia Guamense 

 (Q. and G.) as the type. 



List of species belonging to the marine fauna of eastern America 

 which have been referred to Ethalia : 



Ethalia diaphana (d'Orb.) Dall = Vitrinella diaphana (d'Orb.) 

 Bush, E. anomala (d'Orb.) Dall = Vitrinella anomala (d'Orb.) Tryon, 

 E. semistriata (d'Orb.) 1^ on\%Qn = Pseudorotella semistriata (d'Orb.) 

 Fischer, E. miiltistriata Verrill = Vitrinella? multistriata (Verrill) 

 Bush, E. reclusa Dall, E. suppressa Dall, E. solida Dall, E. {Dill- 

 wynella) tnodesta Dall. 



