CURRENT LITERATURE. I 29 



The portion of the fauna described in the present work includes the Goniatites, 

 and the genera. Badrites and Clymenia, and in its description "an effort is made 

 to elucidate the actual values of species of given or allied Ejenera in a single fauna, 

 and to express these values in terms of one another. . . The purpose throughout 

 has been less to seek phylogenic clues than to present ontogenic values." In each 

 genus, therefore, the author describes very fully all the stages.— embryonic, nepionic, 

 neanic, ephebic and gerontic — of a typical species, and then compares the rest of 

 the species of the genus with that species. 



The Goniatites belong to the families Primordialidcc, Prolecanitidcs, and Magno- 

 scllaridcc of Hyatt. The greater number belong to the Primordicdidce and are 

 referred to one genus for which the author uses Hyatt's name Manticoceras, and 

 maintains that Goniatites intumescens must be regarded as its typical species. The 

 name Gephyroceras is restricted to the discoidal, widely-umbilicated forms with a 

 sulcated periphery which Hyatt placed in that genus ; but in his revision of the 

 Nautiloids and Ammonoids that appears in the English translation of Zittel's 

 Text Book of Palaeontology we notice that I^rof. Hyatt retains both Manticoceras 

 and Gephyroceras, and that the figured example of intumescens is referred to the 

 genus Gephyroceras ; doubtless, however, that author will discuss these genera very 

 fully in his forthcoming Monograph on Fossil Cephalopods. Manticoceras j^attersoni 

 being regarded as the "normal expression of the specific type" all its stages of 

 growth are described in great detail, and the other species — mostly new — of the 

 same genus are then compared with it. Some new species of Gephyroceras, as 

 restricted by the author, are also described. The Prolecanitida:. are represented by 

 the genera Bcloccras, Sandhergeroceras ard a new genus Proheloceras, the type- 

 species of which is Goniatites lutheri, Clarke. The forms belonging to the Magno- 

 sellaridce are referred to the genus Tornoceras, the type-species of which the author 

 considers to be Conrad's Goniatites nniangularis. While some authors have united 

 Hyatt's genera Tornoceras and Parodoceras, Prof. Clarke considers them to be 

 distinct. Tornoceras uniangulare is described in great detail, the author's observa- 

 tions confirming Beecher's admirable account of the early stages of this species. 



The Bactritidce include the genus Bactrites; the early stages of this genus were 

 described by the author in 1894, but they are somewhat more fully descriljed in the 

 present work. We note also that the protoconch, which the author had previously 

 described as belonging to the genus Orthoccras, is now somewhat doubtfully referred 

 to that genus. 



The Clymcnince are represented by one species belonging to the section of 

 Clymenia for which Giimbel proposed the name Cyrtoclymcnia, 



We fully agree with the author's opinion that the Ammonoids of the Naples beds 

 actually lived and died in these sediments, whilst the fauna of the Styliola limestone 

 was transported from an adjoining province not yet known to us. 



In conclusion, the author is to be heartily congratulated on his very careful 

 description of this fauna which is so admirably illustrated on the nine lithographic 

 plates accompanying the work. — Geo. C. Crick. 



Clarke, J. M. — Notes on the early stages of certain Goniatites. Ibid., pp. 165 — 

 169, figs. 



The author first describes "Some Points in the Development of Anarcestes 

 plehciformis, Hall, sp.," a rare and hitherto imperfectly known species found only 

 at a single locality. Cox's Falls, near Charey Valley, N.Y. , in a thin layer of 

 liniestonie belonging to the epoch of the Marcellus Shales (lowest Middle Devonian). 

 The general form of the shell, the character of the whorls, and the shape of the 

 septa show that the species is a typical Anarcestes. The inner whorls are very 

 rarely preserved. "Some etchings of the rock, have however, offered solid barite 

 replacements of the inner whorls," and upon these the author has based his 

 observations. The protoconch is very large, transversely elongate or obtusely 



