CLASS GASTROPODA 
113 
Hipponix antiquatus cranioides Carpenter, 1864 
Annals and Magazine of Natural History, series 3, 14:427. Tryon, Manual of Con - 
etiology, 8:135; PI. 40, figs. 6, 7. 
H. testa valde planata, majore, albida; vertice nucleoso? . . . . ; testa 
adulta apice interdum subcentrali, saepius plus minusve postico; laminis 
incrementi confertis, undique rapide augentibus; striis radiantibus for- 
tioribus, confertissimis, laminarum margines saepe crenulantibus; margine 
acuto; cicatr. muse, angusta, margini continua, regione capitis minore, 
saepe dextrorsum torsa; epidermide? .... Long., 85; lat., 75; alt., 3 
poll. (Carpenter.) 
Rounded, convexly planate, the apex subcentral, radiately striate, con¬ 
centrically laminate. Length, .85 inch. (Tryon, Manual of Conchology.) 
Type in ? Type locality, Neah Bay, Washington. 
Range. Vancouver Island, British Columbia, to San Pedro, California. 
Hipponix serratus Carpenter, 1857 
Mazatlan Catalogue, 296. Tryon, Manual of Conchology , 8:134; PI. 40, fig. 100. 
H.t. conica seu depressa, albida; apice decollato, subcentrali seu valde 
remoto, interdum valde prominente; lamellis crebris, acutis, extantibus, 
basi parallelibus, coneentrice ornata; apicem versus radiatim costata; supra 
lamellas radiatim tenuissime sulcata; basi latissima, planata, lamellis cre- 
berrimis instructa; lamellis profunde serratis, lobis subquadratis; inter 
lamellas epidermide fusca copiosissime induta, taeniis incisis conferta; 
cicatrice musculari transversim corrugata. (Carpenter.) 
Differs from H. antiquatus in the character of the base of the shell 
(margin of aperture), which is broad and flat, made up of very numerous 
close-set lamellae, deeply serrated into large, scarcely rounded lobes; the 
interstices are filled with epidermis, in irregular ribband-like shreds. 
Length, 1 inch. (Tryon, Manual of Conchology .) 
Type in the Liverpool collection. Type locality, Mazatlan. 
Range. Monterey, California, to Panama. 
Hipponix tumens Carpenter, 1865 
Annals and Magazine of Natural History, series 3, 15:180. 1 ryon, Manual of Con - 
etiology, 8:135; PI. 40, fig. 7. 
LI. testa normaliter fornicata, rotundara, albida; epidermide rugulosa, 
interstitiis pilulosa; vertice nucleoso nautiloideo, laevi, parum tumente, 
apice celato, interdum persistente; dein rapidissime augente, expansa, 
undique regulariter arcuata; liris acutis, subelevatis, distantibus, aliis inter- 
I 715] 
