236 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



SoUdnla (sp.) Fischer, Mus. Demidoff, 1807, p. 226 ; Tabl. Synopt. Zooga., 1808, 



p. 126 ; tj'pe Voluta solidula Linne. 

 Tornatelle Lamarck, Extr. du Cours de Zool., 1812, p. 117 ; not latinized, no species 



cited. 

 Torna'ella Lamarck, An. s. Vert., 1822, 6, p. 219. 

 Speo Kisso, Hist. Nat. Eur. Me'rid., 1825, p. 235; type S. bifasciatus Risso, 1. c. fig. 



107. 

 Actaeon Voigt, in Cuvier, Das Tliierr., 1834, 3, p. 201, not of Oken, 1815; Meek, 



Amer. Journ. Sci., 1863, ser. 2, 35, p. 87 ; and the majority of authors. 

 Kanilla Sowerby, Edin. New PhiL Journ., 1833, 15, p. 367, nomen nudum. 



As Montfort says nothing to connect his Acteon ■with tlie mythological proper 

 name Actaeon, tlieir identity is a pure assumption, and I therefore return to the 

 original mode of spelling used by Montfort, Cuvier, D'Orbigny, Agassiz, and 

 others of the earlier writers who adopted it. 



The genus is represented on the west coast of America in the recent fauna by 

 the following groups : 



Acteon s. s. Spire produced, outer lip simple not thickened, a single plait upon the 



pillar, continuous with the anterior margin of the aperture and with no sulcus 



or canal anteriorly. Type A. tnrnatilis Gmel. 

 Rictaxis Dall, 1871 (Aclaeonidea Gabb, 1873). Like ^c^eon, but with the anterior 



end of the pillar truncate and projecting. Both the above operculate. Type 



A. punctocoelata Carpenter. 

 Microgli/phis Dall, 1902. Shell short and swollen, pillar with two distinct plaits 



and a well-marked siphonal sulcus anteriority. Inoperculate. Type A. 



curtulus Dall. 



This last group resembles Tornatellaea {helht) Conrad, 1860, described from 

 the so-called " Lignitic " of Alabama, but tlie latter dilTers by its thickened and, 

 in the mature condition, denticulate outer lip, and peculiar acute nepionic shell 

 which is quite unlike that of any recent form of Acteon known to me. Conrad's 

 original figure was taken from an immature specimen. Tornatellaea is not kuowu 

 in the recent state. M. Cossmann has brought together indications of a large 

 number of forms belonging to tliis family, but, unfortunately, the photographic 

 figures by which tliey are illustrated are so imperfect that it is in mauy cases quite 

 impracticable to gain from them any idea of the exact characters of the specimen 

 figured. 



Acteon panamensis Dall, n. sp. 



I'lato 11, flffure 0. 



Shell with the apex badly eroded, but apparently blunt, with about four whorls, 

 the last much tlic largest; spire shorter than the aperture; suture strongly 

 marked, the whorl in front of it abrupt, but not channelled ; pcriostracum pale 



