HISTORY OF RESEARCH. 



clxi 



•' On the genus Rastrites 

 and some allied species of 

 Monograptus," ' Lund's 

 Univ. Arsskrift,' vol. 3, 

 pp. 1-22. 



Tornquist revises, describes, and figures the chief recognisable forms of Mono- 



graptida) assignable to the group Rastrites of Barrande. He discusses and accepts 



1907. the generic or sub-generic value of the group, and in the 



main body of the paper deals with some thirteen species and 



varieties of Rastrites, among which the following are given as 



new: R. peregrinus (Barr.) var. pecten and var. socialis, 



B. approximatus (Perner) var. Geinitzii. The remainder of 



the paper is devoted to a critical description of those forms 



of Monograptus proper which are most closely allied to Rastrites. Of these one 



new form is given, Monograptus amphibolus (Tornquist). 



1q( ^ The Historical Section of this Sixth Part embraces the 



Elles and Wood, period 1881 — 1895. The Descriptive Section deals with the 



" Monograph of British forms collectively assigned to the genus Diplograptus proper. 



Graptolites,' pt. 2, This section commences with an account of the general 



characteristics of the genus, the nomenclature employed, and 

 Society, 1907. . . . . 5 mi ' . . , . . l / . 



the grouping adopted. Ihe British species and varieties are 



arranged in four main groups. One of these receives a new name, Mesograptus. 

 A minor group is also novel, viz., Amplexograptus (Lapw. MS.). Some twenty- 

 five British species of Diplograptus are described. The new forms noted are 

 Diplograptus mutabilis, ]J. serratus, D. multidens, D. artus, and D. Pageanus 

 (Lapw. MS.). 



Dr. Hind describes and figures two forms of Graptolites 

 discovered by Mr. Tate in the Pendleside Series of the 

 British Carboniferous, viz. ( 'allograptus carboniferus, and 

 Desmograptus Monensis. These forms are of especial interest 

 to geologists and palaeontologists, as no Graptolites had 

 previously been detected in British strata of more recent 

 geological date than the Silurian. 



This second volume, completing the author's Monograph 

 of the Graptolites of New York State, sustains the high 

 reputation of the first volume in respect both to matter and 

 illustrations. It treats of the Graptolites which occur in the 

 New York strata of later geological age than those of the 

 Chazy Formation, commencing with those of the famous 

 Ordovician " Norman's Kill Zone," and ending with those of 

 the American Carboniferous. Like the first volume, it falls into two sections — 

 a General Section, dealing with the literature and geological and geographical 

 distribution of the genera and species concerned, their morphology and zoological 

 relationships, etc.; and a Descriptive Section, in which the forms themselves are 

 diagnosed and figured. 



Full justice is done to the results arrived at by previous observers, and especial 



1907. 



Hind, W. 



" On the Occurrence of 



1 >en<lroid Graptolites in 



British Carboniferous 



Rocks," ' Proc. Yovks. 



Geol. Soc.,' vol. xvi, 



pp. 155-157, pi. xviii. 



1908. 

 Ruedemann, li., 



" Graptolites of New 

 York. Pt, 2 : Grapto- 

 lites of the Higher 

 Beds," ' New York State 

 Museum, Memoir XI,' 

 pp. 1-487, pis. i-xxxi. 



