BRACHIOPODA. 95 



adhered very firmly to the internal side of these shells, it appeareil impossible 

 to make a preparation of the inside." (Waagem, ut. cit.) 



Type, Schizopholis rugosa, Waagen, pi. lx.\xvi, figs. 2-4. 0})ohis Reds, 

 Salt Range = Primordial. 



This genus, represented by a single species, is placed \)y 



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, 



/. e., K. Latourensis, Matthew, A', pannula. White. This 



feature has already been given ainong the generic characters 



of Kutorgina, but it may be held subject to reservation, t:.; ,// 



since positive evidence of its existence in the t\'pe-species, "•' 



K. cingulata, Billings, is still wanting. The resemblance .>,,....;„■. .'■-" 



-Vner Waagen. 



between K. Latourensis ami Schizopholis rugosa is most fig. so. i-cdicie-vaivc, ivont 



view. 



striking in every essential respect, and should the former i-"i« si cai-iinai view, 

 not prove congeneric with A', cingulata, it nuist be referred to Schizopholis; 

 converse!}', 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 1878. 



1847. Acrotreta, KinoiwA. VeilKiiidl. Kills. Miner;il. Gesellsch. zu St. Petei-sbm-g-, p 'JT", pi. vii, lij,'- 9. 



1873. Volbortlda, von JVIoller. Veilmiidl. Kais. Mineijil. Gesell.=ch. /.u St. Petei-sl)urg-, pi. vii, fig. 9. 



1874. Volhwthia, vox Moller. Ntnie.s Jahrb. fiir Miiioi-aloj,'ie, ("tc. Heft 5, p. 140. 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 ^ot^^ ''"^ ^ 



pedicle-valve, from which the apex was broken. '^_ \ i'^-^'^ 



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 



i^olborlhia recurr>i. 



Alter vo.v »l(.i.i,EK. 

 FIG. 52. Pionic 

 FlO. 53. CnnJin.'iI view. 



