50 DKYM.l I 8, MKX1CO AM) ( I.VIKAI. AMERICA. 



oblong-oval, brownish [or white] inside, black-Striated, shining ; 

 peristome acute, the columellar margin vaulted, dilated (1'fr.). 



Alt. 2.'5, diain. 13, length of aperture 12 mill. 



Alt. 21',, diain. 13, length of aperture 12', mill. 



Central Mc.r/'m : <'iir/,-<nin of the city <>f Mexico (Halm); Chapulte- 

 pec (Hegewisch, Ileilprin); Angcmyues, State of Michoacan (I)eppe). 



JBiiliinns nit/is ANTON, Verx. d. Concli. Samml. p. 4.'3 (1839) 

 Pi u. S\ ml . Hist. Ilelic. ii, p. 50 ; Monogr. Helic. Vivent. ii, p. 1 ( J7. 

 REEVE, Concli. Icon, v, //>/////>//*, \\\. 44, fig. 286. Buliinits 

 ( Mi'si'iiihriniis} mill's ALBERS Die Ilelic. ed. i, p. 157. 1M K. in 

 Mulak. Bliitt. ii, p. 158 (18")")) Orthulicns (Mesembrinus') 

 11. A- A. ADAMS, Gen. Kec. Moll, ii, p. 157. Biiltnmlus 

 ri'itis, FISCII. ^ CUOSSK, Miss. Scient: Mex., Mollusea, i, p. 523, pi. 

 23, figs. 6, Ga ; pi. 22, figs. 7-11 (jaw, radula, anatomy) Jl>///,,/,/- 

 lus rudis STUEBEL, Beitr. Mex. Land- und Siissw.-Concli. v, p. (i.'!, 

 pi. 5, fig. 3; pi. G, fig. 9. Otostontus (Scutalus) nulis, MAKT., 

 Concli. Mittheil. ii, p. 193. liiiliniuliis sulcosus, form A, STKKIIKI., 

 Beitr. Mex. Land- und Siissw. -Conch, v, p. (51, pi. 5, figs. 1,2; pi. 



11, figs. 12 a, b, I,'), 14, 15; pi. 1.., fig. 8 (radula) ': linlln, n/ns 



(Scutalus) sulcosus, var ^- fenestratut, MART, in Malak. Bliitt. xii, 

 p. 34 (18G5). Otostoimis nulls MAKT., Biologia p. 209. 



The thinner, more ventricose shell, usually much less strong sculp- 

 ture, and hold striping, distinguish this species from D. sttlcosits. Of 

 twelve specimens In-fore me, two show three somewhat interrupted 

 .-piral hands in connection with the usual streaks; the others have 

 longitudinal stripes or ragged streaks only. Figs. 43, 44 of pi. 15 

 are drawn from specimens from the gardens of Chapultcpec, near the 

 City of Mexico, collected by Ileilprin's Mexican Expedition. They 

 are MTV smooth for the species, being merely wrinkle-striate, and 

 thin, alinii-t fragile. Kii_ r >. 45, 1C. are from specimens more like that 

 illu-trated l>y Fischer i\. Crosse. The lilackish streaks vary from a 

 do/en on the last whorl, to two or three, and may he either continuous 

 or ragged and blotched. 



1). QHIK8BREGH I I ( Fleitl'erj. I'l. 15, figs. 32, 33 ; pi. 1, figs. 72-80. 



Shell perforate, ovate-conic, solid, somewhat rugulo>e->iriale, 

 scarcely shining; white, ornamented with sparse hrown streaks. 

 Spire rather regularly conic, the apex somewhat acute, suture mi- 

 nutely >ernilale. Whorls G, the upper ones hardly convex, the last 



