lUiVOCRAI'TUS. 89 



Var. cumbrensis (Ellesj. J'latc XII, iio-s. 1. n-c. 



1894. Bnjngraptufi ramosiis, Marr, Gcol. Mao-., p. 130, fit,^s. 1—5. 



1898. Brijogiojilus rainoiim, var. cuiuhrenxis, Ellos, QuarL Journ. Gool. Soc, vol. liv, p. 471, figs. 3 and 4. 



In addition to the typical species of Br. Kjerulfi, there occur in tlie iSkiddaw 

 Slates in association with it equally abundant specimens of a form which differs 

 from Br. Kjerulfi in the unsymmetrical disposition of its lateral In-anches, and it 

 seems advisable to separate this as a distinct variety. 



These sj)ecimens were oi'iginally referred by 

 ^'^- ''-"S-eSEiS"''^'"" Marr {loc. cit. supra) to the Br. ramosus of Brogger, 

 which they resemble in the general arrangement of 

 the stipes. It appears, however, certain that 

 Brogger's species is characterised by far more 

 closely set thecje, hence this form was separated 

 later and regarded as a variety of Brogger's 

 Br. ramosus. It is probable, however, that there is 

 Proximal end, showing sicuia and long g^sat Variation in the branching of all Bryograpti, 



nema. Enlargement of PI. XII, ^^-^^^ ^J^^^^ ^^^ ^^^ definite plan is folloWCd CVCU withiu 

 fig. 4 a. A 



the limits of a single species. Since, therefore, the 

 forms here separated as var. cnmhrensis agree very closely with Br. Kjerulfi in the 

 characters of their thecae, and differ only in the possession of un symmetrically 

 disposed lateral branches, we prefer to regard them as a variety of that species. 



Horizon and Locality. — Tremadoc. Lower Skiddaw Slates {Bryograptus beds). 



Lake District : Barf. 



Associates. — Var. cnmhrensis occurs in the Lower Skiddaw Slates associated 

 with Br. Kjerulfi, and also occasionally Avith T. Biffshyi. The best specimens are 

 in the WoodAvardian Museum and Postlethwaito's collection. 



Deflexed Series. 



Bryograpti with flexed main stipes diverging doAVUAvard, the initial angle of 

 divergence being less than 180°. 



Group II.— Type Br. divergens. 



Bryograpti in which the main stipes are flexed and slender, and from their thecal 

 margins lateral branches are given off at irregular intervals. Thecae numerous, 

 inclined at low angles, free for the greater part of their length. 



