6 PROCEEDINGS OF THE NATIONAL MUSEUM ^ vor>. 70 



one of the threads is slightly larger than the rest; the last whorl has 

 two or three larger threads near the periphery with seven smaller ones 

 behind them and nine or ten on the base; aperture rounded quadrate, 

 the pillar obliquely rounding into the simple lip without any marked 

 projection; there is no umbilicus, the interior of the aperture is 

 smooth and pearly white. Height of shell, 35; of last whorl, 23; 

 maximum diameter, 35 mm. U. S. Nat. Mus. Cat. No. 333701. 



Collected by Dr. H. von Ihering at Nicochea, Brazil. A younger 

 specimen was obtained by him from near Monte Hermosa, Argentina. 



This is the largest and most conspicuous species of the genus from 

 the Brazilian coast. 



CALLIOSTOMA DEPICTUM, new species 



Shell small, solid, with about five well-rounded whorls, exclusive of 

 the (lost) nucleus; color pale buff, with conspicuous crimson rather 

 distant spots articulating the spiral sculpture; the decorticated api- 

 cal whorl is blackish brown, the umbilical region and the interior of 

 the aperture white; sculpture on the last whorl above the periphery 

 of five major threads with single minor threads intercalated between 

 them; the threads are not beaded though the incremental lines cut 

 them obscurely; there are about 12 minor close-set threads on the 

 base with one or two coarser ones around the umbilical area; aperture 

 rounded quadrate, margins simple, the concavely arcuate pillar round- 

 ing into the basal lip without any denticular prominence; umbilicus 

 impressed, with a marked groove behind the pillar but not perforate. 

 Height of shell, 10; of last whorl, 7; maximum diameter, 11 mm. 

 U. S. Nat. Mus. Cat. No. 152667. 



Collected at Bahia, Brazil, and received from Dr. H. von Ihering. 



As the apex is somewhat eroded and the nucleus lost, the height 

 normally may be a trifle greater. 



CALLIOSTOMA (RIOENSE. var.?) HERMOSANUM, new species 



Shell of moderate size, resembling C. rioense in form but much 

 larger; color (possibly faded) pale straw color with faint indications 

 of a few brownish obliquely axial streaks ; whorls six or more, exclu- 

 sive of the (lost) nucleus, rather flattish behind the periphery, the 

 suture inconspicuous; spiral sculpture of (on the spire, six) close-set, 

 closely beaded, subequal threads; on the base 12 without beads, and 

 3 coarser ones in the umbilical region; there is no axial sculpture 

 except incremental lines; aperture subquadrate, margin simple, the 

 pillar short, callous, smooth; there is no umbilicus; the interior of the 

 aperture is smooth. Height of shell, 20; of last whorl, 12; maximum 

 diameter, 19 mm. U. S. Nat. Mus. Cat. No. 152887. 



Collected near Monte Hermosa, Argentina, by Dr. H. von Ihering. 



None of the numerous specimens of C. rioense in the collection 

 approaches this in size, and none has so distinctly developed beading. 



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