A correction of the specific nomenclature of several 

 Swedish forms. 



HISTORY OF RESEARCH. clvii 



1905. 



Wall, T. S., Identification of several species of Graptolites collected 



" Victorian Q-rapto- by Mr. Thiele from the Upper Ordovician Strata of Victoria. 



htes, pt. 3, 'Proc. >p w0 new S]H , ( . H , S are fig Ure( j — THplograptus Thielei and 



Roy. Soc. Victoria.' / , ■ , , . 



, • ... Uicranoqrapfus hians. 



vol. xvm, pp. '20-24, 



pi. vi. 



1905. 



' Tornquist, 8. L., 



" Paleontologiska med- 



delanden," 'Geol. Foren^ 



Forhandl.,' vol. 27, 



pp. 452-457. 



1905. The author commences by pointing out (with references) 



Schepotieff, A. how the majority of earlier investigators (18G5 — 1895) were 



" Ueber Stellung der in accord in assigning the Graptolites to the Hydroidea, 



Graptolithe.. im Zoolo- while the ktegt rese archers (1895—1901) have been gradually 



° T " . . ' led to infer that the Graptolites either (1) constitute a special 



' Neues Jahrbuch fur \ v ' l 



Mineralo-'-ie ' 1905 class of Ccelenterata, having a very distant relationship to the 

 vol. 2, pp. 79-98. Hydroidea, or (2) they cannot be compared with any of the 



accepted groups of recent animals, but must be regarded simply as Invertebrata 

 of unknown systematic position. 



The paper itself is devoted to a comparison of the many points of resemblance 

 between the structure of the polypary in the Graptolites (especially the Mono- 

 graptidae) and that of the polypary in the remarkable recent marine organism 

 Bhabdopleura Normani, Allman, some of which were indicated by Allman himself 

 as early as 1872. At that time Bhabdopleura was assigned to the Polyzoa 

 (Bryozoa) ; but the subsequent progress of zoological research has placed it in 

 company with the equally remarkable recent genus, Oephalodiscus, in a special 

 class, Ptcrobranchiata (Ray Lankester, 1884), of the subphylum, Adelochorda, 

 some members of which also suggest affinities with the Echinodermata on the one 

 hand and with the Chordata on the other. 



Schepotieff's residence in Norway, from whose deeper sea-waters the majority 

 of the known examples of Bhabdopleura have been dredged, gave him special 

 advantages on the study of its organisation. He describes his results in detail, and 

 compares them with those of his microscopic study of sections of Bohemian 

 specimens of Monograptus preserved in limestone. 



He describes the main element or stipe of Bhabdopleura as a creeping, 

 longitudinal tube, attached throughout by its flattened dorsal surface to some 

 foreign body. In reality this longitudinal tube is composed of the basal portions 

 of a uniserial succession of dwelling chambers inhabited by the individual zooids 

 of the colony. Each such chamber may be described as divisible into two regions 

 directed approximately at right angles to each other — namely, a basal, or proximal 

 region, forming a constituent part of the longitudinal tube ; and a distal, lateral, 



V 



