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. Ixxxvi, figs. 2-4. Obolus Beds, 

 Salt Range = Primoi'dial. 



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, .-^"f^. 



i. c, K. Latourensis, Matthew, -ST. pannula, 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. dngulata, Billings, is still wanting. The resemblance stM-Mphou>, rugosa 



• After Waaoen. 



between K. Latourensis and bchizopholis rugosa is most fig. so. pedicie-vaive, ivont 



view. 



striking in every essential respect, and should the former fio s' caniin.ai view. 

 not prove congeneric with K. cingulata, it must be referred to Schizopholts ; 

 conversely, if these species are congeneric, it would appear that Schizopholis 

 must be considered a synonym for Kutorgina. 



Genus V L B R T H I A , von Moller 1873. 



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



1873. VoIhm-tMa, von M6li.ek. Verhandl. Kais. Mineral. Gesellsch. zu St. Petersburg-, pi. vii, fig. 9. 



1874. Vulhmihia, vox 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 

 and finely punctate. In general form the shell 

 suggests a " cornucopia, the mouth of which is 



Volbortliia recurva. 



Alter VON Moller. 

 Fig. 52. Profile. 

 Fig. 53. Cardinal view. 



