Victorian Fossils, Part XX III. 391 



fuiiii. Lafoea dtimosa, Fleming sp.i compares rather closely witli 

 tilt) fossil in its more flexible axis and long-conical hydrothecae. 



Genus MastigOgraptus, Ruedemann.- 



Xott. — The reference to the genus Mastigograptus, of the Vic- 

 torian species given below, is made in a restricted sense, taking 

 M. tenuiramosus, Walcott sp. as the type. 3 



Mastigograptus is a genus ^^hich has occurred in the Utica Slate- 

 of Trenton, New York, the equivalent of the Llandeilo Series 

 (Middle Ordovician) of Great Britain. The description of Mastigo- 

 graptus tenuiramosus, Walcott sp. as given by Ruedemann. is as. 

 follows^ :— 



" Rhabdosome forming a densely branched bush attaining a 

 size of 20 cm., the branches extremely slender, especially in their 

 long distal portions (.3 mm. average width), given oft* monopodially 

 and alternatingly small, somewhat irregular intervals (1.5 mm. 

 at an average) andJ at an angle of 50° ; this rather large angle- 

 giving the bushes a characteristic shrubby appearance in the 

 central parts [see pi. IX., fig. 2], while the distal parts are in- 

 clined to become pendent. The branches are filiform, smooth, as. 

 a rule retaining but a central row of circular pits (about 2.2 mm. 

 apart from each other), apparently only on one side of the branch. 

 When perfectly preserved, rows of long conical pedunculate, 

 obliquely ascending appendages, 1.2-1.5 nnn. long are observed' 

 bearing on their pedunculate bases pairs of similarly shaped,, 

 usually shorter and slightly inward curved opposite cones." 



Masf.ig(Kjraptus monegeflne, sp. no v. (Plate XTX., Figs. 2, 2a ; 

 Plate XX., Fig. G). 



Description. — Axis moderately straight, occasionally branchings 

 Hydrothecae long, slender and conical; attached to axis by a slender- 

 peduncle. Gonothecae not so long as the hydrothecae, long- 

 pyrif(»nii and broad near the aperture. 



Length of the axis, 2*5 nun.; thickness, .75 mm. Length of 

 hydrothecae, 8 mm. Length of gonothecae, circ. 4 mm. 



Ohservations. — In the Victorian species the hydrothecae are- 

 apparently attached to the axis without the slender pedunculated 



1 ^ertnlarla.<\umnm,Y\t\\\m<^, Kdiii. Phil. .lonrii., vol. ii., p. 8;^. hnfwn tfuwona, Flcininj; 

 sp., Hincks, loc. supra cit.. p. •20(», pi. xli., fi<r. 1. Alliiiiui. loc. supra cit., 18S8, p. 34, pi. xv., 

 fij,'«. 1, Irt. 



2 Hep. N.V. State Mus., Mem. No. 11, 1!)0S, p. 210. 



3 See IltiedeinaiMi, op. cit., p. 216. 



4 Loc. cit., i>. 2H;. 



