l'LOKA OF THE DEVONIAN. 553 



821, a fern from Colcbrook Dale is figured as /'. hmdiitica, which, so 

 far as I can judge from the engraving, may be identical with the 



present species. Locality, St John. 



Alethopteris ingens 1 Dawson. Pinnules more than an inch wide, 

 and three inches or more in length, with nervures at right angles 

 to the midrib and forking twice. Only a few fragments of pin- 

 nules of this species have been found in the shales aeax St John. 

 They are usually doubled along the midrib, as if it had been their 

 habit to be folded in a conduplicate manner. Their general aspect 

 suggests a resemblance to the Mcsozoic Tamiopterids rather than to 

 the Pecopterids of the Coal formation. 



] y ecopteris {Alethopteris) obscura (?), Lesq. Mr llartt has recently 

 sent to me, from St John, a pinna of a l'ecopteris having oblong, ob- 

 tuse pinnules attached by the whole base, with a slender midrib, and 

 slightly repand edges. The nervures are not preserved. It closely 

 resembles A. obscura, Lesquereux, from the Coal of Pennsylvania. 



Pecopteris [Alethopteris) serrulata, Hartt (Fig. 192, K). This 

 species is, I believe, the same with Neuropteris serrulata of a former 

 paper, the imperfect specimens in my possession causing me to refer 

 it to that genus. Mr Hartt, however, has found specimens which enable 

 him to correct this error. I retain the specific name to prevent con- 

 fusion of terms, though there are already species of Pecopteris known 

 as serrula and serrata. The present species approaches closely to 

 P. plumosa of Brongn., but differs in its more distant pinnules, not 

 connate at the base, with the veins not forking at the margin, and the 

 midrib more oblique and decurrent on the rachis. It resembles 

 rather less closely P. serra, L. and II., and P. delicatula and dentata 

 of Brongn., and may be regarded as the Devonian representative of 

 this group of small-leaved Pecopterids. It is thus described by Mr 

 Hartt :— 



" Tripinnate, pinnae short, alternate, close or open, lanceolate, very 

 oblique, situated on a rather slender rounded subflexuose rachis; 

 pinnules small, linear lanceolate, crcnulatc, revolute, moderately acute, 

 oblique, sessile decurrent, widest at the base, open, separated from 

 one another by a space equal to the width of a pinnule, slightly arched 

 towards the point of pinna ; longest at base of pinna, decreasing thence 

 gradually to the apex ; terminal pinnule elongated. Median nerve 

 entering the pinnule very obliquely, flexuous, running to the apex. 

 Nervules very few, oblique, simple, and somewhat rarely forking at 

 the margin." 



Pecopteris (Alethopteris) preciosa, Hartt (Fig. 192, L). Pinna; 

 a little larger than those of the last species, not serrated ; placed nearly 



