TBMNOGRAPTUS. 85 



original {Bri/ograptns Gallavci) was a specinieii of this variety. In favour of tliis 

 view may also be cited the fact that in Dr. Callaway's collection there is a specimen 

 of this variety which is labelled Bri/ograptas Gallavei. In future, therefore; the 

 form hitherto cited as I>ri/ograptas Oallaiwl should l^o referred to Gloiiograpiiis 

 teneUus, var. Callai-ei 



Horizon and Localities. — Tremadoc. Shineton Shales. 



Shropmhirc : Mary Dingle ; Garmston. 



Associates, etc.—Yar. Gallavei, has \\\) to the present time l)een only recorded 

 from the Shineton Shales of Shropshire, where it occurs associated with 6'. tmelliis. 



The best preserved specimens are in the collection of H.M. Geological Survey. 



Note. — On many slabs of Skiddaw Slate there may be observed several dichoto- 

 mously divided stipes of what may be a species of Glonograptus, thongh in their 

 fragmentary condition specific determination is not advisable. For the most part 

 they appear to be the terminal stipes ; they are slender, flexed, and rather delicate, 

 and have a maxinuim width of about 1 mm. The thecse are very clearly seen ; 

 they are long, narrow tubes of nniform width, nnmbering eight in 10 mm. ; they 

 overlap one third their length, and have straight per})endicular apertures. 



There are also fragments of some rather more robnst stipes in which the 

 thecEe are about ten in 10 mm., and overlap half their length. 



Genus TEMNOGRAPTUS, NichoUon. 



1876. TemnofjrajHus, Nicholson, Greol. Mag., dec. 2, vol. iii, ji. 248. 



Polypary robust, bilaterally symmetrical, consisting of an indefinite series of 



stipes (at least of seven orders) , produced as the result of repeated dichoto- 



mous division fi'om primitive Didymograptus-Glonograptas stages. Sti})es 



of two earliest stages short ; all those subsequently formed of equal length. 



Thccai simple narrow tubes, ovei-lapping for a small poi'tion of their length. 



This genus TemaograpAns is characterised by the possession of stipes of at least 



seven orders. It is closely related to Gloiiograpfns, but seems to possess greater 



capacity for dichotomy ; and in addition, while in GloJiograptas the three earliest 



stages are comparatively short-lived, and the succeeding ones progressively longer, 



in Temnojraptiis the Dkhjinograptas and Tefvagraptiis stages only are short, and all 



the subsequent ones are of equal duration. This implies that after dichotomy has 



taken place twice subregularly (2"), it then occurs at regular intervals. The 



polypary of Teianograptus is also far larger and more robust than that of Gloiio- 



graptas. 



