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, SchizophoUs rugosa, Waagen, pi. Ixxxvi, 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, 

 ?. c, K. Latourensis, Matthew, K. pannula, White. This 

 feature has already been given among the generic characters / 

 of Kutorgina, but it may be held subject to reservation, f ■ % 



since positive evidence of its existence in the type-species, ' ^ 

 K. dngulata, Billings, is still wanting. The resemblance soMzophous rugosa. 

 between K. Latourensis and SchizophoUs rugosa is most fig. so. pecucie-vaive, front 



., . . . , view. 



striking 111 every essential respect, and should the former fig. si. caidinai view. 

 not prove congeneric with K. cingulaia, 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 V L B II T H I A , von Moller 1873. 



1847. Acrotreta, Kutokga. Vei-handl. Kais. Mineral. Gesellsch. zu St. Petersburg, p 277, pi. vii, fig. 9. 

 1873. VolhortMa, von Moller. Vei-haiidl. Kais. Miuei'al. Gesellsch. zu St. Petersburg, pi. vii, fig. 9. 

 1S74. Volhcirthia, vo.n- Mollek. 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 



Volborthia recurva. 



and finely punctate. In general form the shell Alter von mollek. 



'' '^ ° FIG. 52. Profile. 



suggests a " cornucopia, the mouth of which is ^''*- ^^- cardinal view. 



