30 NK. E. S. COUBOLD ON THE TEI10BITE FAENA [March 1913. 



where the fold increases to about double its original width ■ 

 between tbis, the glabella, the facial suture, and the ocular ridge is 

 a rhomboidal fiat space. 



facial suture. — Anterior branch curving rapidly outwards 

 from the eye-lobe to take a coarse almost exactly at right angles. 

 to tbe axial line, until it reaches the marginal fold : here it turns 

 abruptly forwards, and passes to the front border parallel with the 

 axial line. Posterior branch short, sigmoidal, and extending 

 outwards to about the same distance as the eye-lobe. 



Doublure. — In one specimen the upper part of the marginal 

 fold is broken away, disclosing the cast of the doublure ; it is as 

 wide as the maximum width cf the upper part of the fold, and is 

 distinctly more convex. 



Test. — The specimens on which this description is based are 

 internal and external casts in sandstone that is too coarse to 

 preserve any fine surface -markings. One or two fragments 

 associated in the same rock, and probably belonging to the same 

 species, have parts, at least, of the surface covered with fine granu- 

 lations set well apart one from the other (see PL II, fig. 10 c,;which, 

 however, is taken from the axis of a pygidium). The doublure is 

 furnished with a number of raised lines sub-parallel to the margin, 

 and slight traces of similar lines have been detected on the upper 

 part of the marginal fold. 



The free cheek [1435] (PI. II, fig. 2) and the hypostoma 

 [1449] (fig. 5) were found in the same rock-bed; the latter is of the 

 type of that of P. bohemicus Bosck and P. tessini Brongn., but 

 seems proportionately narrower, and the border between the two 

 posterior hooks is strongly curved. The width shown in the figure 

 is necessarily an approximation. 

 Thokax : (?) PL II, figs. 6-8. 



The thoracic segment (fig. 7) has unfortunately been broken up. 

 It is remarkable for the narrowness of the axial portion in pro- 

 portion to the spread of the pleurae (it apparently occupies onlv 

 a fifth of the total width), and also for the curved hook-like 

 termination similar to that of Paradoxides bohemicus var. salopiensis 

 Cobbold, from Neve's Castle. 



The fragment [1455] fig. 8 appears to be part of one of the most 

 posterior pleura?. 



Pygidium : (?) PL II, figs. 9-11. — Up to the present only one form 

 of pygidium has been found in the same rock-bed as that which has 

 yielded the cranidia ; there is little doubt that it belongs to the same 

 species. It varies a little in contour, but is always nearly circular. 

 In general form it is like that of P. hicksii from South Wales, but 

 shows only one feebly-marked annulation of the axis (apart from 

 the articulating facet). Linnarsson's figure of the pygidiuni of 

 P. sjogreni is very like the Comley form, but it is more quadrate. 



The surface-characters, shown in one specimen [1443], consist 

 of very fine raised lines near the border (fig. 10 d) and minute 

 granules standing well apart one from the other on the axial lobe 

 (fig. 10 c). 



