BRACHIOPODA. 
95 
adhered very firmly to the internal side of these shells, it appeared impossible 
to make a preparation of the inside.” (Waagen, ut. cit .) 
Type, Schizopholis rugosa, Waagen, pi. lxxxvi, figs. 2-4. Obolus Beds, 
Salt Range = Primordial. 
This genus, represented by a single species, is placed by 
Dr. Waagen, with unquestioned accuracy, among the 
Siphonotretids. Its closest alliance is with Kutorgina, or 
with those species of that genus which have afforded 
definite evidence of an open fissure on the subapical area, 
i. e., K. Latourensis, Matthew, K. pamula , White. This 
feature has already been given among the generic characters 
of Kutorgina, but it may be held subject to reservation, 
since positive evidence of its existence in the type-species, 
K. cingulata, Billings, is still wanting. The resemblance schizopholis rugosa. 
. After Waagen. 
between K. Latourensis and Schizopholis rugosa is most fig. so. Pecucie-vaive, front 
striking in every essential respect, and should the former fig- 51. cardinal view, 
not prove congeneric with K. cingulata , it must be referred to Schizopholis; 
conversely, if these species are congeneric, it would appear that Schizopholis 
must be considered a synonym for Kutorgina. 
Genus VOLBORTHIA, von Moller 1873. 
1847. Aci’otreta, Kutorga. Verhandl. Kais. Mineral. Gesellsch. zu St. Petersburg, p 277, pi. vii, fig. 9. 
1873. Volborthia, von Moller. Verhandl. Kais. Mineral. Gesellsch. zu St. Petersburg, pi. vii, fig. 9. 
1874. Volborthia, von Moller. Neues Jahrb.fiir Mineralogie, etc., Heft 5, p. 449, pi. vii, figs. 1-6. 
Type, Acrotreta recurva, Kutorga. Lower Silurian (= Primordial ?). 
The genus is founded on the third of Kutorga’s species of his genus 
Acrotreta, a form of very large size compared with the type of the genus. 
Kutorga’s description covers only a single 
pedicle-valve, from which the apex was broken. 
The better examples described by von Moller 
show that the shell-substance is calareo-corneous 
and finely punctate. In general form the shell 
suggests a “ cornucopia, the mouth of which is 
Volborthia recurva. 
After von Moller. 
Fig. 52. Profile. 
Fig. 53. Cardinal view. 
