82 UKYM.ll -, MEXICO AND CENTRAL AM1.KICA. 



lli-t. Nat. de> Aiiim. sans Vert., ed. >, viii, p. 27'.'. Pri:., 

 Ilclic. \'ivcnt. ii, p. 17(>. REKYE, Conch. Icon. v. /!u////i//s, pi. _'."., 

 tig. 11"). TATK, Amer. .hmrn. Couch, v, pp. l.VJ, 1 .")('.( 1 s7<>). 

 Jiulinms (Mi-si'iitliriiiiis) ili'siTr/iuns ALBERT, Die Helic. e<l. i, p. 1/i.S 

 Pi K., in Malak. BHitt. ii. p. 1/).S (IS,")")). Ort/mtirits ( Mrsent- 

 brinus) discrepans H. & A. ADAMS, Gen. Rec. Moll, ii, p. 1~>7. 

 Hiilltii "/im (Liostractts) discrepans FISCH. & Ci;o>- i . Mi--. Scient. 

 MIX., Mollusca, i, p. 503. Otostomns diai-n'/nnis VOM MAKII\-, 

 Biol. Centr. Amer., p. 230. 



Allied to D. Uvescens and some forms of ]). mtiltilii/i'iitnt, Imt thin- 

 ner than the latter, with fewer whorls and somewhat ditli rent rolor- 

 atinn. Some specimens >lm\v a narrow spiral Kand revolving a little 

 above the middle on the ante-penultimate and next earlier whorls. 

 Specimen- tVom Gusnacasta examine(l hy Dr. von Martens are 

 smaller, measuring: Alt. 16, breadth 8, and aperture \) mill. So\v- 

 erby's type from Concbagua measured : Alt. C.7, diam. (.33 inch. 



D. SK.Mii-Ki.i.rciDUS (Tristram). PI. 4, tigs. 71, 72, 73. 



Sliell imperforate, ol)long-conic, fragile, shining, "emipellucid, 

 white, marked with sparse opaque streaks. Spire conic, acute : suture 

 deep. Whorls (>, convex, the last a little longer than the spire, in- 

 flated, rounded at base; columella vertical, straightened. Aperture 

 slightly oblique, angulate-oval ; peristonie thin, the right margin very 

 little expanded, columellar margin shortly reflexed. 



Alt. IS, diam. H mill. ( Tristr.) 



Guatemala (S&lvin). A T . 1C. Cmtfn Ri<-<i: Guanacasta, in the Bay 



of Xiilintis (Pittier). N. E. Citsln Rim: Pu<rl<> \'irjn, <>n the Rio 

 S<irtii>i</u! (Biolley). Ce/ifi-tif Cnsfn Rir : Alujin-ht (Orosco). 



/In/tutus si-iiiii>i'Hin-!ilnx TIM-TI; \M. 1'. /.. S., isi'.l, p. 2.">0, pi. 26, 



fig. H. I'l It. Monogr. Helic. Vivent. vi, p. 22 Jiuliiiinliis (I.instni- 



Ctu] .iiii/n'llii,-iiliis Ki-fii. iV Ci;ci--i . .Mi->. Scieni. Me\., .MolhiM'a, 

 i t |>. ,")()7. (ttfisfiniiiis si'ini/iflliii-iiliix .M \KII.\-. Uioliigia, j>. 2.'!('i. pi. 

 15, f. Hi. 



'' I am rather inclined to think that this is an albino variety of 0. 

 lisi-fi'jiinis. The speriiueii from Giiaiiacasta, from which our figure 

 i- taken, ha- a few brownisli obliipie stripe* on the whorl before the 

 la-t, \\hereas in all re>p--ei- it agrees with the l\ev. 11. II. Tristram's 

 description and figure; Imt as the whorls area little more convex 

 than in 0. <lim-r<-/>uns, and the umbilical cleft completely closed, I 



