HELICOPHANTA. 151 



S. studeriana Fer. vi, 87.' 



Genus HELICOPHANTA Ferussac, 1821. 



Helicophanta FER. (in part), Tab. Syst. des Anim. Moll., p. 

 xxxii ; Tab. Syst. de la Fam. des Lin^ons, p. 23, 25 (contains, 

 premier groupe Yitrinoides, H. brevipes, H. rufa and deuxeme 

 groupe Vesiculse, H. cafra, H. cornu-giganteum, H. magnified). 

 BECK, Index, p. 46 (except first species). ALBERS, Die He!., p. 

 110 (in part). ALB. -MART., Die Hel., p. 148, type H. magnified. 

 Leiostoma SWAINS (in part) Malacol., p. 328. Eurycratera H. & 

 A. Ad., Gen. Rec. Moll., ii, p. 190. 



Shell large, capacious, Helicoid or bulimiform, imperforate or 

 umbilicate, consisting of 4-5 rapidly enlarging whorls, the several 

 earlier forming the embryonic shell, the diameter of which exceeds 

 one-third that of the adult ; the post-embryonic growth consisting of 

 1J whorls or less, the last very large, deflexed in front. Aperture 

 large ; lip narrowly expanded or reflexed, the columellar margin 

 dilated at its insertion. Type H. magnified Fer. (see pi. 38, fig. 4, 

 H. goudotiana. PI. 38, fig. 5, H. cornugigantewii) . 



Animal completely retractile into the shell, having the foot large 

 and fleshy, sole not divided longitudinally, transversely wrinkled : 

 sides of foot granular and obliquely deeply grooved down to the sole 

 edge ; tail rounded behind, smooth above. Mantle margin enor- 

 mously thickened, having small right and left body-lobes (pi. 49, fig. 

 23, showing animal of H. magnified completely retracted within the 

 aperture, the end of tail visible in the mantle cavity). 



Jaw strong, slightly arched, smooth ; having no trace of vertical 

 strise (PI. 49, fig. 19, H. magnified). 



Radula resembling that of Acavus, Ampelita, and especially 

 Panda. Central and lateral teeth with single cusps, shorter than 

 the basal-plates ; marginals with long, oblique cusps (pi. 48, figs. 12, 

 .13, H. magnified, central with adjacent lateral, a lateral, and group 

 of marginals, with outermost marginal tooth). 



Genitalia opening near the right eye-tentacle. Penis very large 

 and flattened, the retractor attached midway its length and inserted 

 distally on the lung floor ; vas deferens entering beyond the insertion 

 of the retractor, and continued inside in a vesicular enlargement of 

 the penis-wall to the apex of penis, where it opens into the large, 

 smooth-walled penis-cavity. Vagina large, short; uterus large. 



