PHYLLOCMJAPl^US. 101 



AJJinlties. — Tliu sliorter and broader forms of /*. angustifoUiis ai)proacli /'., 

 ^^ „, „ , ,.^. ,, cf. ti/2)us iu general sliai)e, but can l^G distino-uislied 



I. 59. — PhyUofiraptus anijushjohus, ' -^ o i ^ i^ 



Hall. bj— 



^j^*v , (1) the form of the thecal apertm'e, 



.^^/v^^^-i ■ (2) the greater number of theca; in a given 



"*■€;, I unit of leno-th. 



-^"^>v|j \ Horizon and Localitie!^. — Arenig, Middle Skid- 



■^^^-h-' ' thiw Slates. 



Lake District : Barf ; Carlside ; Whiteside ; 



Distal thecce in relief, showin;;); form of -n -i t /^ -r-> .-i -j. c< i t i ir 1 1 



aperture. Enlargement of PL iA^andal Urag ; iiassenthwaite hand- beds ; Knott 



XIII, fig. 7.. x5. Head, Whinlatter; Ellergill. 



Associates, etc. — P. angustifolius has as yet only been recorded from the Skiddaw 

 Slates, where it seems to be a very abundant form ; numerous specimens collected 

 from various localities are in the collections of the Woodwardian Museum, the 

 Keswick Museum, the British Museum, and in the private collections of Postle- 

 tliAvaite and the authors. It occurs associated with F. tj/pus, P. anna, Tptragraptus 

 Bigshgi, and Dicliograptus octohracldatus, and would thus seem to have had a fairly 

 long range in time. 



Phyllograptus anna. Hall. Plate XIII, figs. 6 a^. 



1865. Phyllograptus anna, Hall, Grapt. of Quebec Grroup, p. 124, pi. xvi, figs. 11 — 16. 

 1898. Phyllograptus anna, Elles, Quart. Jouru. G-eol. Soc, vol. liv, p. 494, fig. 16. 



Stipes forming the polypary united so as to form two small narrow intersecting 

 ovals, which are widest in their central portions. Thecae fourteen to sixteen 

 in 10 mm., direction of growth constant, curvature varied in amount, three 

 times as long as wide, in contact throughout their length. Apertural 

 margins concave, mucronate, oblique. 



Description. — The polypary is always very small ; none of the specimens exceed 



127 mm. in length ; they appear to be 



FiGs.QOaa.U'Xh.— Phyllograptus anna, 'H.aW. COmUlOuly about 10"5 mm. loug, and liaVC 



I a maximum width of 5 mm., which is 



Vu;i:'f^.- -^filX: J ..^ attained a little distance below the distal 



'J^.f ; v;^^ ^ The polypary seems to be developed on 



i"i¥^^ ' '^ the same general plan as that indicated by 



K Holm for the species P. angustifolius. The 



a h sicula is long, probably about 2 mm., and 



a. Impression of proximal end, showing inJications tllC first tllCCa, wllicll appears tO arise 

 of virgula. Enlargement of PI. XIII, fig. G c. i i i • i 



h. Proximal end. Enlargement of PI. XIII, tig. G/. near to its apical end, rescmblcs the sicula 



