CLASS GASTROPODA 
47 
Type in ? Type locality, coast of California. 
Range. California. (Forbes.) 
Thais canaliculata compressa Dali, 1915 
Plate 35, fig. 2 
Proceedings of the United States National Museum, 49 :569; PI. 74, fig. 2. 
Shell similar to the typical form but with the elevated ridges or major 
spirals flattened down until the interspaces become almost linear. There 
are 6 or 7 on the penultimate whorl and 12 or 13 on the last whorl. Height 
of shell, 34; of last whorl, 29; of aperture, 23 ; breadth, 22 mm. (Dali.) 
Type in United States National Museum, No. 60102. Type locality, 
Monterey, California. 
Range. Known only from type locality. 
Genus ACANTHINA Fischer, 1807 
Coquille semblable a celle des Purpura; labre portant a sa partie 
anterieure et pres du canal une dent conique plus ou moins longue; bord 
columellaire aplati, simple. Opercule de Purpura. (Fischer.) 
Shell ovate, last whorl large; spire rather elevated; aperture semilunar; 
inner lip wide and flattened; inner lip crenulated, with a prominent tooth 
at the fore-part. (Tryon, Structural and Systematic Conchology.) 
Type. Acanthina imbricata Lamarck. 
Distribution. California to Chile. Fossil: Tertiary of Chile. 
Subgenus Acanthinucella Cooke, 1918 
Acanthina spirata Elainville, 1832 
Nouvelles annates du Museum, Paris, 1: 252; PI. 12, fig. 8. 
Coquille de 12 lig. de long, sur 6 de large, espaisse, solida, ovale, 
fusiforme, a spire assez elevee, subturriculee, formee de quatre a cinq 
tours, dont les premiers sont cordonnes par des series decurrentes de 
squames, le dernier settlement strie; ouverture ovale, subcanaliculee, colu- 
melle lisse, subombiliquee, cinq denticules au bord droit; couleur brune en 
dehors, d’un blanc violet an dedans. (Blainville.) 
Shell fusiform, whorls with a salient angle; flattened above; spirally 
sulcate; sulci with transverse lamellar striae; the third whorl from the 
apex longitudinally costellate; color pale, with angular dark-brown spots; 
within white, with two or three purple spots; tooth very slender. (Conrad.) 
This is Conrad’s description of his species engonata, which is the same 
as spirata. 
[345 ] 
