208 
PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 
Species of Tritonium offering a similar structure to these two Patago- 
nian species are found in the so-called “older” Tertiary beds of Austra- 
lia (see Tate, 1888, p. 116, ff), but they require further investigation. 
Fam. B U CCINIDAd Trosch. 
Gen. BUCCINUM L. 
138. Buccinum (Cominella) anne: Ortmann. 
PI. XXXIII, Fig. 1 7. 
1900 B. a. Ortmann, in: Amer. Journ. Sci., v. 10, p. 374. 
Shell subfusiform, elongated-oval. Spire long. Whorls 7-8, angu- 
lated, the angulation with a series of tubercles, 12-14 on the last whorl 
which are continued downward as irregular longitudinal ribs. Upper 
part of whorls (above angulation) slightly concave, appressed toward the 
suture. Exposed part of upper whorls, below angulation, subcylindrical. 
Whole surface of shell covered with numerous revolving striae, which are 
somewhat unequal. Last whorl large. Mouth ovate, elongate, upper 
end subcanaliculate, lower end truncate, and with a short, reflected canal, 
forming a varix on the columella. Inner lip a little expanded, thin. 
Outer lip thin, smooth within. 
Height, 66 mm ; diameter, 30 mm. 
Remarks : The tubercles of the angulation become somewhat irregular 
on the last whorl, and indistinct near the mouth. The longitudinal ribs 
are irregular on the last whorl, sometimes two of them starting from one 
tubercle, sometimes being quite indistinct. This species belongs to the 
subgenus Cominella, 
The specific name is given in honor of Mrs. Anna Ortmann. 
Record of specimens : Mouth of Santa Cruz River, 4 sp. 
Affinities: This species comes near B. veneris Basterot (1825, p. 47, 
pi. 2, f. 15) from the Miocene of Southern and Western Europe. The 
general form is essentially the same, only the canal is a little longer, and 
the ornaments of the shell are slightly different : in B. veneris the angu- 
lation has more numerous and more closely set tubercles, and the longi- 
tudinal ribs are indistinct or wanting. There is no other Buccinum , to 
my knowledge, that resembles our species so much as this one. 
