62 [April, 



sinuations or coarse vermiculations of yellow. Beneath silvery white. Legs 

 transversely barred. Two and a half inches long. 

 Hab. Sacketts Haibor, N. Y. 



14. Rana pretiosa, B. and G. Female. Body thick and stout ; head short, 

 broader than long. Tympanum not two-thirds the length of the eye. Tongue 

 large. Palatine teeth minute, posterior to the inner nares. Skin leathery, co- 

 vered with asperities, except on inner surfaces, even on the sole of the foot. A 

 depressed ridge of skin on each side, none intermediate ; a glandular ridge along 

 the upper jaw. Femur not half the length of the body ; tibia about equal to it, 

 but shorter than the hind foot. Terminal joint of longest toe free, next margined, 

 and web generally extending between the tips of the toes on one side, and the 

 last articulation on the other. Shortest toe rather more than one-third the length 

 of the hind foot, both measured from the tarsus. Above yellowish brown, with 

 rounded dark blotches. Sides dusky; dorsal ridge lighter; a light line along the 

 posterior ridge of the upper jaw. Faint indications of a dark area about the 

 tympanum ; a few spots about the nostrils. Beneath yellowish white, obsoletely 

 marmorated with brown. About two and a half inches long. 



Syn. Rana pretiosa B. and G., Proc. Acad. Nat. Sc Phila., vi. 378. 

 Hab, Washington Territory. 



15. Rana cantabrigensis, Baird. Above yellowish brown. A dark vitta 

 through the eye, margined below by whitish. Lateral fold of skin light colored, 

 as is also a median dorsal line extending from the snout to the anus. A narrow 

 light line along the posterior faces of the thigh and leg. Tibia half the length 

 of body. General appearance and size of R. sylvatica. 



Hab. Cambridge, Mass. (Collection of Prof. Agassiz.) 



16. Rana boylii, Baird. Abroad depressed ridge of skin on each side of back. 

 Skin finely tubercular above. Head broader than long. Tympanum scarcely 

 evident, pustulated. Tibia more than half the length of body; hind foot less 

 than half this length; webbed entirely to the horny tips; outer toe decidedly 

 longer than the third, An elongated tubercle at base of inner toe, with another 

 opposite to it. Above dull reddish olivaceous, with indistinct blotches on the 

 back, and fascia on the legs. Beneath yellowish, mottled anteriorly. Two inches 

 long. 



Hab. California (interior.) 



17. Scaphiopus couchii, Baird. Outer toe but little shorter than the third. 

 Hand nearly as long as forearm. Above grayish ash, with dark markings. A 

 dark line down the back from each orbit, in connection with other markings, 

 causing a slight similarity of pattern to Hyla versicolor. Beneath white. An 

 inch long. 



Hab. Coahuila and Tamaulipas. 



On Fossil Coniferous Wood, from Prince Edward Island. 



By J. W. Dawson. 



Under the impression that any facts relating to the formation which lias af- 

 forded the interesting reptilian fragment recently described by Dr. Leidy in the 

 Journal of this Academy, will prove interesting, 1 beg leave to communicate 

 the following results of microscopic examinations of the coniferous wood referred 

 to in my note appended to Dr. Leidy's paper. 



I may premise that Prince Edward Island, which extends in an east and west 

 direction about 130 miles, with an extreme breadth of about 35 miles, consists 

 almost entirely of bright red sandstones, similar to the matrix of Dr. Leidy's 

 fossil, with occasional bands of red clay, conglomerate and arenaceous and con- 

 cretionary limestone. Over a large part of the island, these beds dip at very 

 small angles to the northward. There are, however, some tracts in which the 

 beds undulate to the southward and south-east. These red rocks, in their mine- 

 ral character, much resemble the new red sandstone of Cornwallis and other 



