ORTMANN ! TERTIARY INVERTEBRATES. 
247 
Distribution: Jegua quemada, Suprapatagonian beds (v. Ih.). 
Affinities: In external form, this species might be compared with the 
same as the foregoing species. In the peculiar development of the spiral 
sculpture it differs, however, and in the latter respect it recalls the Euro- 
pean Eocene B. glaphyra Deshayes (1864, p. 639, pi. 39, f. 6-18). The 
external form of the latter is less cylindrical, and more ovoid. 
CRUSTACEA. 
ClRRIPEDIA. 
Fam. LEPADIDAE Darw. 
Gen. SCALPELLUM Leach. 
174. Scalpellum juliense Ortmann. 
PI. XXXVII, Fig. 9 a ‘ c . 
1900 S.j. Ortmann, in: Amer. Journ. Sci., v. 10, p. 377. 
Only the carina known. 
Carina narrow, elongate, strong and solid, curved ; basal margin bluntly 
pointed; surface smooth, but with lines of growth. Tectum strongly 
arched in its upper part, only slightly so in its lower; upper part solid, 
its cross section almost quadrangular ; this form is brought about by the 
presence of a prominent ridge on the concave side, formed by the junc- 
tion of the inflected parietes on each side. Parietes very narrow, separated 
from the tectum by distinct, but blunt ridges. 
Length, 40 mm; width, 8 mm. 
Remarks: The only carina at hand resembles so closely that of 5 . solid- 
ulum Steenstrup (see Darwin, 1851, p. 42, pi. 1, f. 8) from the Upper 
Cretaceous of Scania, that I have no doubt that it belongs to the genus 
Scalpellum as well as that species. S. solidulum differs from all other 
species of the genus in the solid, almost quadrangular, section of the 
upper part of the carina, brought about by the peculiar conformation of 
the “parietes,” and this very character is exhibited in our fossil, as may 
be seen at once on comparing our figure g c on plate XXXVII with Dar- 
win’s figure 8 C . Our species differs from S', solidulum in the absence of 
