102 



BRITISH (iRAPTOLiTES. 



Climacogr 

 HU (Carr). ' 



P 



10 nun., having an average length of 1*5 mm., overlapping about one-half 



their extent; apertnral margin horizontal, situated in deep excavation 



occupying fully one-third of the Avidth of the polypary and one-fourth of its 



ventral margin. 



Description. — The polypary measures 0*8 mm. in width at the proximal end, 



but widens within 4 mm. to its maximum breadth, 



so that the margins are parallel to each other for 



the greater part of their extent. 



In the reverse aspect of the polypary the proxi- 

 mal end has a very compact and rounded off appear- 

 ance, and the only part of the sicula visible is its 

 virgella. In the obverse aspect the sicula is seen 

 for 1 mm. of its extent; th. I 1 originates 1*3 mm. 

 above the aperture, and the polypary develops in the 

 usual manner. In one specimen the virgula is seen 

 to be expanded into a small vesicle. 



The septum originates at once between th. 2 1 

 and th. 2 a . 



Affinities. — 01. minimus is a form originally 

 described by Carruthers as a Diplograpsus, but the 

 characters of the thecas proclaim its connection with 

 the Climacograpti. It is characterised by its rela- 

 tively great width in proportion to its length, a 

 feature which serves to distinguish it from allied 

 forms, such as Gl. b rev is. 



Horizon and Localities. — Hartfell Shales 

 (Dicranog. Giingani and Pleurog. linearis zones). 



8. Scotland: Dobb's Linn; Hartfell; Mount 

 Benger Burn. Wales: Railway Pendwr, south of 

 I! Id herston ? 



< Collections. — British Museum (Natural History), Lapworth, and the Authors. 



,i. Proximal end, obverse view. On 

 same slab as PL XXVII, fig. 1 g. 



b. Obverse view, showing sicula. Dobb's 



Linn, Hartfell Shales (zone of 

 Pleurog. linearis). Coll. Elles. 



c. R ■verse view. On same slab 



XX VII, figs. 1 a— e. 



Climri-coqraplus 



(Carr). 



PL 



• '. Distal thec.r. Knlargvnient of part 

 of PL XXVII, fig. If. 



Climacogr aptus brevis, sp. nov. Plate XXVII, tigs. 2 a — -/. 



1885. 67. cfr. minutus, Man- and Roberts, Quart. Juuru. Greol. Soc, vol. xli, p. 476. 



Polypary small, about 1*5 cm. in length and having an average uniform width 

 of about 1 nun. Sicula 1 nun. in length; virgella conspicuous; virgula 

 distally prolonged. Thecas fourteen to ten in 10 mm., nearly opposite, short 

 tubes having an average length of about 1 mm., overlapping about one- 



