62 DRYM.KIS, MEXICO AND CENTRAL AMERICA. 



I). TKIM \KIAM - (V.HI Martens). PI. '2. figs. 17, 18. 



Shell riinalc perforate, ovate-fusiform, rather thin, lightly striutu- 

 late. soinewliat shining; white, usually painted with fragments of 

 interrupted hands. Spire attenuated, rather acute. the apex pah-. 

 Whorls 7. a little convex ; suture impressed, delicately and irregu- 

 larly erenulated, the last whorl moderately attenuated at base. Aper- 

 ture nearly vertical, less than half the total length of the shell, oval- 

 oblong; peristome a little thickened, narrowly expanded, white ; 

 columellar margin nearly straight, a little thickened, reflexed. half 

 covering the perforation (Martens). 



Alt. 32, diam. 14. length of aperture 144, breadth 7 mill. 



Alt. 27. diam. 12, length of aperture 12-j. breadth 7 mill. 



N.- Jr. Mexico: Tr<-s Marias Islands (Forrer and Richardson). 



OtoKtonniK triniariiiii/is v. MART., Biol. Centr. Amer.. Moll.. p. 

 21G, pi. 13, f. 17 (August, 1893). 



This species almost forms a connecting link between ()f<>xtt>//uis 

 attenititfits, < >. serperastnnii and < ). jxilli'dior Sow. the latter from the 

 Peninsula of Lower California ; it resembles 0. <iit< mnitiis but has 

 not its thread-like, twisted, columellar margin. From ( >. jmlli/liur 

 it is distinguished by the less conical, in the last whorl much more 

 oblong, form, the thinner shell, and the narrower aperture; from (). 

 siTiHT<ixtrnin also by the general shape of the shell. Some specimens 

 are entirely white; others have more or less distinct traces of pale 

 brown spots on the penultimate whorl arranged in four spiral rows. 

 corresponding in position to those of < >. si'i-jicrastrinii ( the fifth and 

 sixth being covered by the following whorl) but they do not extend 

 over more than half the whorl in the spiral direction" 



I). HSPAT08TOMI - ( Pleiffer). PI. 2, figs. 23-27. 



Shell perforate, Bllbfusiform-oblong, rather solid, smoothish ; white, 

 marked sparselv with brown streaks. Spire conic, rather acute; 

 -utiin- submarffined. Whorls C>, moderatelv convex, the last a little 



tf 



longer than the -pin-, .-omewhat tapering at base. Columella verti- 



cal. -iraighteneii. Aperture scarcely oblique, olilong, liver-colored 



inside, gloy ; perislome white, the right margin narrowly expanded, 



columellar margin flat, broadly retlexed. 



All. .'52, diam. 1.'!. length of aperture 17 mill. (/'/'') 



,V. M,:rii;i : 'J', />n n i stlnlin <K-<I (lioncard); .1 injn il,i. State of OoXdCO 



(Hbge), 



