178 LIGUUS COROXA. 



Habitat unknown; "Brazil" (in coll. Acad. Nat. Sci., with L. 

 regalis). 



Helix (Cochlitoma^) regina FERUSSAC, Tabl. Systemat. p. 4J, no. 

 342, based upon Histoire pi. 119 (exclusive of " /?, minor," and 

 '* monstrum, a sinistra " (1823 ?) Achatina mtlastoma SWAINSON, 

 Zoological Illustrations iii, pi. 152 (excluding " var (reversed) A. 

 perversa "), (1822-3) Achatina melanostoma Sw., GRAY, Annals 

 of Philosophy (new series) ix, p. 414 (June, 1825) Orthalicus rex, 



a. dextrorsus, BECK, Index Moll., p. 60 (1837) Achatina regina 



Swains., REEVE, Conch. System ii, pi. 177, f. 8 Achatina regina 

 Fer., PFR., Monogr. ii, p. 244 (A., dextrorsa). 



In any division of the regina group, either into species or varieties, 

 the typical regina of Ferussac must be restricted to his figures 3, 4, 

 5, of plate 119 of the Histoire (similar to the form shown in my pi. 

 33, figs. 1, 2). That he included a form " /3, minor" (= Oxystyla 

 bensoni} and a " monstrum, sinistra " (Ligaus perverstis) as pertain- 

 ing to the species, is true ; but obviously neither of these was regarded 

 by him as typical. 



Regardless of questions relating to the limits of the several var- 

 ieties, typical regina is the large solid dextral form with pink spire 

 and yellow-tinted body-whorl, upon which yellowish-olive streaks 

 appear, at first separated, but upon the latter half of the whorl 

 crowded and dark, or forming an almost uniform blackish-olive coat. 

 Svvainson's A. melastoma (pi. 33, figs. 4, 5) is a smaller specimen in 

 which the longitudinal streaks are more developed upon the spire. 



It is difficult to tell what form was collected by Lieutenant Eyries 

 near Cayenne, French Guiana ; for while Drouet (Moll. terr. et 

 d'eau douce Guyane Franaise, p. 67) refers to Ferussac's figures 

 3-5, which represent the typical regina, yet he says that the peri- 

 stome is white, and expressly states that he has not seen melanostoma 

 Gray from French Guiana. The white peristome would also ex- 

 clude L. incisus, which is reported from Guiana on Cuming's au- 

 thority, and indicates the upper Amazon species, L. regalis. 



L. PERVERSUS (Swainson). PI. 36, figs. 20, 21, 22, 23. 



Sinistral, oblong-conic, thick and solid. Flesh-colored, with a 

 black-brown belt at the periphery, occasionally interrupted, and over- 

 lying a slightly wider white belt, which shows at the edges of the dark 

 band, and where the latter is interrupted ; a narrow black varix on the 



