376 G. J. HIKDE ON- ANls^ELID JAWS PEOM THE WEDLOCK AND 



tending obliquely downwards to form a rod-like prolongation, the 

 posterior end truncate, a relatively stout curved anterior hook sepa- 

 rated by an interval from the 8 blunted nearly upright denticles on 

 the slightly arched upper margin of the jaw. Length 1 line ; width 

 j line. Abundant. 



This form of jaw is of the same type as^. lunatus,!!., but differs 

 iu the projectiug anterior hook, the truncated extremity, and the 

 fewer denticles. 



Log. and form. Much Wenlock ; Iron Bridge : Weulock group. 

 Ludlow ; Stoke Edith : Upper Ludlow group. 



Akabellites similis, Hinde. 



Arahellites similis, Hinde, Quart. Journ. Geol. Soc. vol. xxxv 

 pp. 382, 384, pi. XX. fig. 8. 



Examples of this form, though not unfrequent, are in a poor state 

 of preservation : so that it is difficult to determine whether they pro- 

 perly belong to this or the allied form A. cristatus. Whilst some 

 are undoubtedly identical with A. similis, there are certain speci- 

 meus which in their dimensions and the form of the denticles appear 

 to be intermediate between A. similis and A. cristatus. 



Log. and form. Much "Wenlock : Wenlock group. Ludlow ; 

 Stoke Edith ; Upper Ludlow group. 



Genus Lumbeiconeeeites, Ehlers, 1868. 



Lumbeiconeeeites basalis, Hinde. 



Lumhriconereites hasalis, Hinde, Quart. Journ. Geol. Soc. vol. 

 xxxv. p. 383, plate xix. fig. 22. 



The English examples of this species do not possess the stout 

 anterior tooth, and are of smaller dimensions than the Canadian 

 forms ; but in their general figure, number of denticles, and di- 

 stinctive flange they are similar. Average length 1 line. 



Log. and form. Much Wenlock ; Wren's Kest, Dudley : Wenlock 

 group. 



Genus Staueocephalites, Hinde, 1879. 



Statteocephalites seeetjla, Hinde. (PI. XIY. figs. 18-20.) 



Jaw elongated, compressed, in some instances having the anterior 

 border slightly incurved ; generally, however, the jaw-plate is flattened 

 and in shape like the blade of a common hand- saw ; the posterior 

 end narrowed and slightly truncate ; on the upper margin a series 

 of from 15 to 17 denticles, gradually diminishing in size towards the 

 posterior end. The denticles are of very varying forms in different 

 examples — either short and rounded, triangular and pointed, or 

 needle-shaped ; and they are either upright or directed backwards. 

 In the majority of examples the anterior tooth is but slightly larger 

 than the next following it in the series ; but occasionally it is more 

 prominent, yet similar in form and direction to the others in the 



