ENCRINURUS MULTISEGMENTATUS. 89 



Family Encrinurid.e. 



Gemis ENCRINURUS, Emmricli. 

 Encrinurus contentus, sp. nov. Plate VI, figs. 11, 12. 



Specific Cliaracters. — Pygidium suboval, acutely pointed behind, strongly 

 convex from side to side, arched down steeply behind, widest across middle. 



Axis conical, elongated, slender, tapering slowly to acute tip, not reaching 

 posterior margin, but with small narrow raised post-axial piece behind it ; axis 

 composed of 10 — 12 complete narrow rings, each with indistinct lateral nodules, 

 forming half its length, followed by 12 — 14 incomplete rings, the median third of 

 the axis for this posterior half being smooth; each complete ring ornamented with 

 pair of small tubercles situated rather less than one-third the width of the 

 axis apart. 



Lateral lobes with anterior edges sloping back, arched down steeply, composed 

 of six simple flattened pleurae, curved back so as to lie nearly parallel to axis ; first 

 five pairs originate from anterior half of axis and end freely in short blunt points ; 

 sixth pair very short, arising at about three-fourths the length of axis, closely 

 pressed against it and against post-axial piece, and not projecting behind. 

 Surface of pleurse finely and sparingly tuberculated. 



Dimensions. — 



Length of pygidium .... 8'5 mm. 



Maximum width of ditto . . . . 8'6 ,, 



Width of axis at front end . . . 3"0 ,, 



Remarks. — This little species, of which only the pygidium is known definitely, 

 is much like E. sex-costatiis, Salter,^ but differs in the longer, narrower and 

 tuberculated axis and in the pleurae being bent back more sharply so as to lie 

 almost parallel to the axis. 



Horizon and Localit)/. — Balclatchie Group (Llandeilo) : Balclatchie. 



Encrinurus multisegmentatus (Portlock), var. nov. trispinosus. Plate VII, 



figs. 1—3. 



1906. Encrinurus multisegmentatus (Portlock) Eeed, op. cit., pt. iii, p. 122, pi. xvi, figs. 9 — 11 a. 



In the specimens referred by me to Encvimirus miiUisegmenfatns (Portlock) 



from the Starfish Bed, there was no indication of any peculiarity in any of the 



thoracic segments differentiating it from this species. But in three specimens 



1 Salter, ' Mem. Geol. Surv.,' dec. vii (1853), pi. iv, figs. 1—12 ; Vogdes, ' Traus. San Diego Sec. 

 Nat. Hist.,' vol. i, no. 2 (1907), p. 70, pi. ii, figs. 1—12. 



