554 THE DEVONIAN PERIOD. 



at light angles to the rachis, obtuse, narrow toward the extremity, 

 suddenly widened or almost auriculate at the lower side ; midrib ex- 

 tending to the apex ; nerves few, at a somewhat acute angle. 



Alethopteris Perleyi., Hartt (Fig, 192, M). " This species resembles 

 Alethopteris serrula of Lesqx. It differs from it in the following 

 points : — The pinnte are wider and closer, and not so long ; the pinuje 

 are usually trideutate. The teeth acuminate, the middle one some- 

 times emarginate. The vein is three-forked, sending a veinlet into 

 each lacinia. The middle veinlet branches in the middle lacinia. In 

 A. serrula the pinnules, or, as Lesqx. terms them, the lohes^ are united 

 more than half the way up. A. Perleyi has the pinnules united only 

 one-third of the way ; and whereas in the former they are divided by 

 a sharp gash, in the latter they are divided by a deep rounded sinus. 



" Dedicated to the late M. II. Perley, Esq., H.M. Commissioner 

 of Fisheries and Vice-President of the Natural History of St John." 



[Incertce sedis.) 



Cardiocarpum corniitiiin, Dawson (Fig. 194, A). Broadly ovate, 

 emarginate at base, dividing into two inflexed processes at top. A 

 mesial line proceeds from the sinus between the cusps, downward. 

 Nucleus more obtuse than the envelope, and acuminate at the top. 

 Surface of the flattened envelope striate, that of the nucleus more or 

 less rugose. Length about seven lines. Numerous in shale near St 

 John. The specimens are all perfectly flattened, and many of them 

 are also distorted, being elongated or shortened according to the 

 direction in which they lie in the shale. The nucleus constitutes a 

 strongly shaded spot of graphite. The flattened envelope appears as 

 a less distinct wing or border. 



Cardiocarpum obliqinim, Dawson (Fig. 194, B). Unequally cor- 

 date, acuminate, smooth, with a strong rib imssing down the middle ; 

 length about three lines. Found with the preceding. It somewhat 

 resembles some of the forms of C. acidum, L. and H. 



Cardiocarpum Crampii, Hartt (Fig. 194, C). Elongate, slightly 

 expanding at the middle, obtuse at base, obtuse or emarginate at apex, 

 length one inch, greatest breadth '25 inch ; nucleus small, central, 

 oval, connected by a median line with the extremities ; surface of 

 margin slightly rugose. This fruit may at once be recognised by its 

 resemblance to the samara of an ash. It is dedicated to Mr Cramp 

 of St John, a zealous collector of the Devonian plants. 



Cardiocarpum Bailei/i, sp. nov. (Fig. 194, D). This species, 

 discovered by Mr Hartt, is the largest and most beautiful of these 

 winged fruits as yet afl"orded by the Devonian. It is broadly cordate 



