DRYM^US, SOUTH AMERICAN. 311 



Bulimus flavidus MENKE, Verzeichn. d. Conchylien-Samml. des 

 Freiherrn v. d. Malsburg, p. 6 (1829). PFR., Monogr., viii, p. 166. 

 Otostomus flavidus MARTENS, Binnen moll. Venez., p. 185 (29), pi. 

 1, f. 9. Helix liliacea var. flavescens FER., Prodr., no. 401 ; His- 

 toire, p. 42 B, f. 14. Bulimus liliaceus REEVE, Conch. Icon., pi. 45, 

 f. 287. Bulimulus flavidus STREBEL, Beitrage Mex. Land- und 

 Siissw.-Conch., v, p. 89, pi. 12, f. 15 (shell) ; pi. 15, f. 6 a-d, 10 (an- 

 atomy). 



This species was formerly placed in the synonymy of B. strami- 

 neus by Pfeiffer, its validity being first demonstrated by Dr. von 

 Martens in 1873. He writes: Very similar to the preceding [vir- 

 ginalis], but fuller and fatter in form, the color intense yellow, 

 spiral striation the same; 23 mill, long, half that breadth ; aperture 

 somewhat less than half the total length, the peristome very weakly 

 expanded. In the Berlin Museum there are specimens (No. 10,338) 

 with the above name, from the Malsburg collection, which agree 

 well with Ferussac's fig. 14, some of them, especially, showing the 

 characteristic rose-red color near the aperture. 



D. DEBILIS (" Beck " Martens). PI. 26, figs. 74, 75. 



Very similar to the preceding \J). flavidus], but of fuller form, 

 the color more yellowish, the peristome, it seems, quite unexpanded, 

 the spiral striation the same. Length 23 mill., diam. and length of 

 the aperture nearly or fully half the length of shell. The contour 

 is much the same as in B. detritus ; the color becomes a pronounced 

 yellow on the lower half of the last whorl. One of the three exam- 

 ples show traces of spots on the upper whorls (Martens). 



Caracas, Venezuela (Lansberg, in Berlin Mus.) ; Antilles (Beck). 



Bulimulus debilis BECK, Index Moll., p. 65 (1837), based upon 

 Ferussac, Histoire, pi. 142 B, f. 10. Otostomus (Mormus) debilis 

 MARTENS, Binnenmoll. Venez., p. 186 (1873). Not Bulimus fra- 

 gilis Lam., DESHAYES in Fer. Hist., ii, p. 73. 



This species was based by Beck on two figures of Ferussac (re- 

 produced on my plate), without a description. These figures have 

 been considered to represent D. stramineus Guild., an interpretation 

 favored by the locality given by Beck. Dr. von Martens, however, 

 has identified as Beck's species certain shells from Caracas, Vene- 

 zuela, his description of which is given above. While no certainty 

 is, at present, attainable, I have accepted von Martens' identifica- 

 tion as temporarily the best course. 



