﻿I860.] 



SALTER BOLIVIAN FOSSILS. 



71 



Cruziana Cucurbita, n. sp. PI. V. figs. 4, 5, & 6. 



Three inches long, elongate, clavate, curved into a shape more or 

 less sigmoid, subcyhndrical in section, compressed ; rounded at the 

 anterior end, tapering posteriorly ; smooth, except a few irregular 

 wrinkles, but with a raised longitudinal rib throughout (down each 

 side ?). 



I am not sure whether the raised rib which runs from end to end 

 of these shapeless masses is an external marking, or arises from an 

 internal hard cylinder. Fig. 6 shows some irregular transverse 

 wrinkles ; but, except these, there is no marking whatever to distin- 

 guish this form, which may be recognized by its blunt clavate shape, 

 like many of the gourd-fruits, whence the name. 



Locality. Very plentiful on the surfaces of grey schist. Valleys 

 of Unduavi and Aceromarka. 



Cruziana Unduavi, n. sp. PL V. figs. 7 & 8. 



Three or four inches long, subcylindrical, but often flexuous, 

 slowly tapering. Surface marked with numerous (9 or 10) longi- 

 tudinal ribs, which run for short distances only, and alternate, 

 leaving some parts smooth. The general direction of the ribs is 

 longitudinal, but wavy. 



Localities. Valleys of Aceromarka and Unduavi, where it is most 

 abundant. 



Boliviana, gen. nov. 



Form obcordate or sagittate, tuberculate or ridged, without a 

 central furrow, and produced behind into two barbs or wing-like 

 appendages. (A peduncle or stem occurs in some species.) 



These broad arrow-shaped forms differ so much from the true 

 Cruziana, that it does not seem premature to separate them. (I 

 leave the elongate forms at present all in one genus.) And the 

 general term Bilobites may still be conveniently used for the whole 

 group, though not now accepted as a generic term. 



Boliviana Melo cactus. PI. V. fig. 9. 



Three-quarters of an inch long, obcordate, deeply notched behind, 

 and pointed and produced backward on each side. Surface gently 

 convex, rising into a ridge along the median line, which projects 

 a little in the middle of the deeply emarginate posterior edge. Six 

 longitudinal ridges, narrower than the central one, run along the 

 whole length, with irregular tubercles on them, arranged so as to 

 form tranverse rows, seven or eight on each side. 



A rough resemblance to the mammillated plants so common in 

 the region of the Andes suggests the name. 



Locality. Valley of Aceromarka, north-eastern slope of Illimani. 



Boliviana proboscxdea. PI. V. fig. 10. 



This appears to be only about half of the disk, and it is therefore 

 described as if the longitudinal ridge (a) were central. An inch 

 and a half long, narrow- sagittate, lanceolate, convex j with a verj 



