civ BRITISH GKAPTOLITES. 



Opisopodes. — M. priodon, M. Flemingii, M. riccartonensis, M. nodifer, M. sar- 

 torius, M. scanicus, M. capillaceus, J\I. flexuosus, M. retroflexus. 



KamplopoJes. — M. testis, M. bohemicus. 



Prosopodes. — M. dubius, M. colonus, M. cultellus, M. uncinalus. 



Gyrtograptus. — G. Grayi, G. spiralis, G. Murchisoni, var. crassiusculus, C. 

 Carruthersi, and the new species: G. dubius, G. Lapworthi, G. pulchellus, G. 

 flaccidus, G. moniliformis, G. rigidus, G. Lundgreni. 



Retiolites Geinitzianus and the new genus Stomatograptus with its species 

 S. Tornquisti arc also described and figured. This last genus, originally 

 described by Tornquist as a Betiolites, is characterised by the presence of large 

 pores on the sides of the polypary by means of which the " lateral canals are in 

 connection with the exterior." 



Structure. — A detailed account of the structure of Retiolites is given, which in 



some respects marks an advance on the results already arrived at by Tornquist, but 



no figures are given illustrating the points of structure described. 



1883. A stratigraphical paper was also published by Tornquist 



fornquwt. during the year, which was the forerunner of a series of 



" Bergbygnaden inuni . , . -in n . r , -, ^ ■,.. ,, T 



.,. a , , . papers by him entitled bihansomradets Graptohter. Jn 



Sirjansomradet 1 l . 



Dalarne " ' Sver. Geol. this memoir the various zones of the Rastrites and Retiolites 



Uiiclers.,' ser. C, no. 57. shales are given and correlated with those abroad. 



1883-84. In 1883-84 Postlethwaite published a paper in which he 



Postlethwaite, dealt with the structure, classification, reproduction, and 



" Graptolites of the gtate of preservation of the Graptolites found in the Skiddaw 



Skkldaw Slates," m . -, , . ,. , „ ,-, » -in 



olates, and gave a complete list or the forty species already 



i-FilllS. \_/llllll). Assoc 



for Advancement of obtained from these beds. 



Literature and Science,' He figures a few of the most typical species, and among 



vol. viii. them a new form of Tetragraptus, which was subsequently 



described by Elles (in 1898) as Tetrag. Postlethwaitii. 



.. Dr. Spencer, who had previously described (in 1878) 



Spencer three new genera and nine new species of Dendroid Grapto- 



' Niagara Fossils,' pt. i ; Htes from the Niagara formation, but had given no figures 



"Graptolitidaj of the of these new forms, figured and re-described them in a paper 



Upper Silurian Sys- published in 1884 ; and in addition one new genus and twenty- 

 tem," 'Bull. Mus. of . , . , , „ ., . . . -, ,. 



, . . ., two new species, making a total of thirty species and tour 



genera. A brief account is given by him of the distribution, 



zoological affinities, structure, reproduction, and classification of the Graptolites. 



The descriptions are brief and the figures poor. 



Description of Species. — The species described are Vhyllograptus ? dubius, 



Retiolites venosus, Dendrograptus ramosus, I), simplex, IK Dawsoni, IK frondosus, 



J), praegracilis, IK spinosus, JK (s.g. Chanograptus) novellus, Callograptus Niaga- 



rensis, G. Granti, G. multicaulis, G. minutus; Dietyonema retiforme, D. gracile, I). 



