482 MICHIGAN SURVEY, 1905. 



EUCONULUS FULVUS (MuUer). 



Shell subperf orate, subcorneal, thin, pellucid; smooth, shin- 

 ing, minutely striated, amber-colored; whorls 5 rounded above,. 

 the last one distinctly angular in front, the angle disappearing 

 on the latter part of the whorl ; suture distinct and deep ; aper- 

 ture transverse, narrowly lunate, rounded below, peristome 

 simple, acute; base convex, indented. 

 E.fuivus.xbi. Alt. 3, greater diam. 4, lesser 3^ mm. 

 Helix fulva, Draparnaud, Hist. Nat. Moll. France,^81, pi. VII., fig. 12-3, 



(1805). 

 Zonites fulvus, W. G. Binney, Am. Land Shells, 67, fig. 26, (1885). 

 Helix chersina, Miles, Rep. Geol. Surv. Mich., 235, (1861). 



Conulus , Currier, Shell-bearing Moll. Mich., 4, (1865). 



, DeCamp, Shell-bearing Moll. Mich., 5, (1881). 



Zonites fulvus, Walker, Rev. Moll. Fauna Mich., 16, (1894). 



Common and of general distribution in both peninsulas. This species is 

 distinguished from E. chersinus polygyratus by its more conical, less elevated 

 spire, fewer, wider whorls and peripheral angle, the aperture is more trans- 

 verse and more rounded below. 



E. fulvus mortoni Jeffr., was cited in my Terr. Moll, of Mich. (1894), 

 from East Saginaw. The recent receipt of authentic examples from England 

 has shown that the identification was erroneous. 



EUCONULUS CHERSINUS POLYGYRATUS (Pilsbry). 



Shell minutely perforate, subglobose elevated, conical, thin, 

 pellucid, smooth, shining, deep, brownish amber-colored; 

 whorls 6 or more, rounded, very narrow; the last bluntly but 

 decidedly angular in front, the angle above the middle of the 

 whorl, base pecuharly sloping below the periphery; spire ele- 

 Fig. 54. vated, outline convex; upper surface with lustre of silk; base 

 E.chersinr^vdygyratus^^^^^^^ ^.^^^ ^ ^-jj^^ ^^^^ arouud the outer margin; suture dis- 

 tinct and deep; aperture transverse, very narrow; peristome simple, acute. 

 Alt. 2.2, diam. 3 mm. 

 Conulus chersinus polygyratus, Pilsbry, Naut. XII., 116, (1899). 



Not as common as the prece(^ng species, but* of general distribution in 

 both peninsulas. 



The narrow whorls and peculiar base of this species result in making the 

 aperture narrower and less transverse than in typical fulvus. The convex, 

 dome-shaped spire and more numerous whorls are also very characteristic, 

 when once recognized. 



Subfamily ARIOPHANTIN/E Pilsbry. 



"^ System bearing a long dart-sack, surmounted by one or more coronal 

 glands, and usually containing a slender curved dart. 



