86 BRITISH GRAPTOLITES. 



Tlie only species Ijeloiiging to tliis genus at present known in Britain is T 

 midtipJex. 



Temnograptus multiplex (Nicholson). Tlate XII, fig. 1. 



1868. Dichofjrajjsus multiplex, Nicholsou, Quart. Jouru. Geol. Soc, vol. xxiv, p. 129, j)!. vi, figs. 1 — 3 



1876. Temnograj)his multiplex, Nicholson, Geol. Mag., dec 2, vol. iii, p. 248. 



1898. Ttmnograptus multiplex, EUes, Quart. Journ. Geol. Soc, vol. liv, p. 477, fig. 6. 



Stipes very slightly curved and of an approximately uniform width of 2 nnn. ; 

 stipes of first order short, those of second order somewhat longer, while all 

 stipes subsequently formed are about 2"7 cm. in length. Angle of divergence 

 decreasing with remoteness from the sicula. Thecas nine in 10 mm., inclined 

 30° ; average length 2 mm., three to four times as long as wide ; outer wall 

 slightly curved ; overlapping one third their length. Apertural margin con- 

 cave, normal. 

 Description. — The stipes of the first order [Didymographis stage) are short, not 

 exceeding 4 mm. in length ; those of the second order (Tetragraptus stage) have a 

 length of about 8" 5 mm. ; while those of the third, fourth, fifth, sixth, and seventh 

 orders have a length of 27 cm. The angle of divergence between the stipes 

 appears to diminish steadily as it gets further away from the proximal end, and 

 thus between the two stipes of order 2 the angle is about 90° ; between those of 

 order 3, 75^; batween those of order 4, about 70°; between those of order 5, 

 50° ; between those of order 0, about 40°. 



Nicholson gives the number of thecas as six in 

 Fm. '^8--^™3™^^«^ multiplex, ^Q ^^^^^^^ (sixteen to iucli), but as many as nine in 

 p-r^ 10 mm. can be counted on some of the distal stipes. 



tl"'5> Affinities. — T. niultiplex resembles at first sight 



p-%. the compound Dichograpti {Holog Deani and 



V}' Trochog. (Jifasus) ; it should, however, be readily 



lf^;\y separated from these l)y the character of its brancli- 



|/'/. ing, which is dichotomous throughout. It r(.>sembles 



|l,>, the Clonograpti in its branching, but is more robust 



^ and possesses greater capacity for dichotomy. 



Distal thocae. Enlarfjoment of part of it • i t t± a • iv/r* in ai • i i 



PI. XII, fig. 1. Jlorizoii and Locality.— Aremg, Middle Skiddaw 



Slates. Lake District : Peelwyke, BassenthAvaite. 

 Associates, etc. — T. imdtlplex has been recorded from the Skiddaw Slates of the 

 Lake District only. Its associates are unknown. The two ty])e s})ecimens are in 

 Cliristopherson'B collection, and are on the same slab ; the reverse of one of these 

 is in the Woodwardian Museum, the reverse of the other in the collection of tlie 

 Geological Survey at Jermyn Street. 



