232 PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 



It is probable that the doubtful casts from Santa Cruz referred to V. 

 alta by Sowerby also belong to this species. We do not possess the true 

 V. alta from Santa Cruz. 



Record of specimens: Mouth of Santa Cruz River, 17 sp.; Upper Rio 

 Chalia, i cast. 



Distribution: Santa Cruz, Patagonian formation (Phil., v. Ih.). 



Affinities: In general form and size this 'species corresponds closely to 

 the living V. and/la Sol. (Reeve, 1851, pi. 17, f. 39; Tryon, 1882, p. 97, 

 pi. 29, f. no; Lahille, 1895, p. 21, especially pi. i, f. 9, pi. 8 and n), but 

 it differs chiefly in the presence of longitudinal ribs on the upper whorls. 

 It is quite possible that this is the ancestral form of V. ancilla. 



In Australia, this species is represented by V. halli Pritchard (1896, p. 

 101, pi. 2, f. 1-3) from supposed Eocene, but probably Miocene beds of 

 Tasmania and Victoria. This species has the same mamillate (Scaphel- 

 loid-) apex, but seems to possess a shorter mouth and longer spire. 



1 6O. VOLUTA DOMEYKOANA Philippi. 

 PL XXXVII, Fig. i a ' 6 . 



1887 V. d. Philippi, Tert. & Quart. Verst. Chiles, p. 70, pi. 8, f. 4. 



1899 V- pilsbryi v. Ihering, in : N. Jahrb. Miner., etc., v. 2, p. 34, pi. 2, f. 9. 



1900 V. domeykoana Ortmann, in: Amer. Jour. Sci., v. 10, p. 381. 

 Shell ventricoso-fusiform ; whorls 5 (besides the apex). Spire short, 



conical. Mouth considerably longer than half of the shell, about as long 

 as three-fifths of it. Whorls convex, with a distinct shoulder, upper part 

 concave, and appressed toward the suture. Surface with spiral striae, 

 which become indistinct on the last whorl, and with longitudinal ribs, 

 which form distinct nodes on the shoulder. Last whorl inflated, large. 

 Mouth wide, elongated. Columella with tv/o plaits, and sometimes with 

 a suggestion of a third (upper) one. 



Height, 149 mm; diameter, 72 mm (almost complete individual, only 

 apex gone). 



Remarks : V. Ihering figures the lower part of a very large individual, 

 and has sent to us the same part of another, large one, which both agree 

 well with our specimens, two of which are almost of the same size. On 

 the other hand, our fine individual figured on pi. XXXVII, fig. i a , agrees 

 so closely with the description and figure of Philippi's V. donieykoaua, 



