HISTORY OF RESEARCH. 



cxv 



1892. 



Mob erg, 



" Om skiffern med 



Clonograptus tenellus, 



dess Fauna och Geolo- 



giska Alder," 



' Geol. Foren. Forh.,' 



bd. xiv. 



representation of the conjectural connection of the Monograpti reversi and M. 

 erecti with a hypothetical disc." 



In 1892 Moberg described the fauna of the Clonograptus 

 Beds of Sweden, and added two new species. He discusses 

 briefly the various genera included in the family of the 

 Dichograptida3, and points out that nearly all these genera 

 are founded on the somewhat unsatisfactory character of 

 differences in the mode of branching, and are as a rule 

 typified by only one species. He refers his new species 

 doubtfully to Bryograptus. 

 Clonograptus tenellus is fully described, and a variety of it — var. hians — is pro- 

 posed. The new species are : Bryograptus ? hunnebergensis, and Bryo. ? sarmen- 

 tosus. The author discusses at length the resemblances and differences between 

 Clonograptus and Bryograptus, and points out that it is probable that Didymograptus 

 was developed from the latter genus. 



Moberg also enters fully into the question of the age of the Clonograptus 

 tenellus beds. 



In a second paper published during the same year Moberg 

 described two new genera of Dichograptidas from the Lower 

 Graptolite shales of Scania. One of these is Maeandrograptus, 

 with its species M. Schmalenseei, a form intermediate 

 between Bidyniograptus and Dicellograptus, the "sicula giving 

 rise directly (near its broader end and on the same side) to 

 many thecce." 



The structure of the proximal end of Didymog. gibberulus is also worked out by 

 Moberg with great care, and on account of its peculiarities he suggests that the 

 species should be made the type of a new genus Isograptus. 



In addition to the two new genera, he describes and figures a new species of 

 Azygography {A. suecicus). 



1892. 



Moberg, 



" Om nagra nya Grap 



toliter fr&n Sk lines 



Undre Graptolits- 



kiffer," ' Geol. Foren. 



Forh.,' bd. xiv. 



1892. 



Moberg, 



Eeferat von G. F. 



Matthew " On a new 



Horizon in the St. 

 John's Group," ' Geol. 

 Foren. Forh.,' bd. xiv. 



A third paper published by Moberg during this year 

 consists of a review of Matthew's paper " On a New Horizon 

 in the St. John's Group." He gives a summary of Matthew's 

 results and compares them with the occurrence of the 

 Dictyonema and Bryograptus beds in Sweden. 



1893. 



Moberg, 



" En Monographic 



forsedd med discus,' 



' Geol. Foren. Forh., 



bd. xv. 



In 1893 Moberg described a very curious species of Mono- 

 graptus — M. pala — provided with a disc at the proximal end. 

 The presence of a disc had not been previously observed in 

 Monograptus. 



