17* i.Kiffs i "i;..\A. 



Il(il>i(nt iniknnirn ; " />'/-ti:il" (in coll. Acad. Nat. Sci., with L. 

 regalia). 



lli'li.r ( < 'nclilitinnti i ri'ijinti Fi:KissAC, Tabl. Systemat. p. 4J, no. 

 :!li', based ti|ini) Ilistoire pi. ll'J (exclusive of " /?, minor," ami 

 " iii'iiintrinii, n sinistra " (1*2.'! ?). Aflmtinti ntcltixtimni SWAINSUN, 

 Zoological Illustrations iii, pi. l.~>2 (excluding " var (reversed) -I. 

 perversu"), (1822-3). Aclniti'im iitrlninmlvind S\v., GKAY, Annals 

 of Philosophy (new series) ix. p. 414 (June, 182")). OrthoKetu rex, 

 a. dextrorsus, l>i.< K, Index Moll., p. (i() (1837).- Aflntliiui ri'(/iini 

 Swains., RKKVK, Conch. System ii, pi. 177, f. 8 --- -[rlxitiim rci/i/m 

 F6r., 1'ri:., Monogr. ii, p. 244 (A., dextrorsa). 



In any divi.-ion of the reyinct group, either into species or varieties, 

 the typical rcyinn. of Fcrussac must be rcstrictcil to his tig u res 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" ( = = Ojrystyltt 

 bensoni} and a " nionstruin, sinistra " (Lnjims perversus) as pertain- 

 ing to tin- species, is true ; but obviously neither of these was n-gardi-d 

 by him as typical. 



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

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

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

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

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

 SwainsoiiV A. iiH'I<ixtoiit (pi. 33, tin-. 1. ">) is a smaller specimen in 

 which the longitudinal streaks are more developed upon the spire. 



It is diflicult to tell what form was collected by Lieutenant K\ ries 

 near ('avenue, French (iuiana ; for while Drouet (Moll. terr. et 

 d'eaii douce Guyane Franeaise, p. (17) refers to Fernssac's ligures 

 3 r >, which repre>eiit the typical rct/iiiti, yet lie says that the peri- 

 --tiiiiM- i- white, and expressly stales that he has not seen melanostoma 

 Gray from French (Jniana. The white peristotne would also ex- 

 clude /.. iiictsiix. which is reported from (Juiana on Cuming's au- 

 thority, and indicates the upper Ama/on specie.-, /,. 



L. i-KKVKn-i - (Swainson). PI. .".c., ligs. 2(), 21, 22, 23. 



Sini-lral, oblong-conic, thick ami solid. F/esh-colored, iciffi a 

 - la-turn ln'lt at tin' periphery^ occasionally interrupted^ "//'/ orrr- 



iiitj it xlii/litli/ irnli'i- irhiti' ln'lt, which >hows at tl ..... dges of the dark 

 Jiand. and \\ hen- the latter i- interrupted ; a narrow black varix on the 



