1856.] 265 



Besides these species, Thryothorus ffuttaius, Gould, P. Z. S., 1836, p. 39, and 

 Picolapies cinnamomeus, Less. R. Z., 1844, p. 433, are sometimes considered as 

 probably referable to species of this group. 



A very closely allied form is Heleodytes, of Cabanis. I have made remarks 

 on the synonyms of the type of this genus (S". ffrisem), in Proceedings Zool. 

 Society, 'l856, p. 97. 



Notice of remains of two species of Seals. 

 By Joseph Leidy, M. D. 



1. Phoca Wymani. 



Remains of a Seal. Wyman, Am. Jour. Sci. x. 229. 



Phoca Wymani, Leidy. Anc. Fauna of Nebraska, 8. 



A tooth, apparently an inferior canine, from the miocene deposite of Virginia, 

 recently presented to the Academy by Prof. Tuomey, I suspect to belong to the 

 same species as the remains of a seal from the same deposite, described by Prof. 

 Wyman. 



The tooth is 14 lines long, and about as robust in its proportions as the cor- 

 responding tooth of P. barbata. The crown is 4J lines long and 3J broad at 

 base ; and it presents an anterior and a posterior ridge, of which the former is 

 denticulated, and bifurcates half way towards the base. The enamel is rugose, 

 especially towards the base of the crown internally ; and at one or two points 

 in front and behind it presents a short inconspicuous tubercle. 



2. Phoca debilis Leidy. 



A species of seal is apparently indicated by three specimens of molar teeth 

 obtained by Capt. Bowman, U. S. A., from the sands of Ashley River, South 

 Carolina. The teeth bear considerable' resemblance to the corresponding ones 

 of Otaria jubata, having small, compressed conical crowns, tuberculate in front 

 and behind, and single, long, gibbous fangs. The smallest specimen is 5J lines 

 long, and the largest, when perfect, was about an inch long. 



Descriptions of new fossil species o/ Mollusc^ collected by Dr. F. V, Hay den, in Ne- 

 braska Territory; together with a complete Catalogue of all the remains of Inverte- 

 brata hitherto described and identified from the Cretaceous and Tertiary Formations 

 of that region. 



By F. B. Meek and F. V. Hayden, M. D. 



Since the publication of our former papers on the Nebraska fossils, some ad- 

 ditional collections have come to hand, containing new species, which we here 

 propose to describe. Along with these we also find better specimens of some of 

 the species previously investigated by us, than those first received, so that we 

 are now able to correct a few errors into which we had been led, in consequence 

 of having only imperfect specimens to examine. The extensive material at our 

 command, also enables us to rectify some little confusion in the labors of others, 

 which doubtless resulted from the same cause. In order to do this, as well as 

 to furnish a convenient index to these Nebraska species, we append to this 

 paper a complete list of all the fossil invertebrata now known from the rocks of 

 that country. 



In glancing over this catalogue, the paleontologist will not fail to be struck 

 with the great preponderance of Lamellibranchiata, Gasteropoda, and Cephalopioda 

 over all the other invertebrate forms of life. Among all the collections we have 

 yet seen from this region, the Bryozoa are represented by but one rare species 

 of Reticidipora, and the Brachiopoda by only one species of Caprinella and one of 

 Lingula, both so rare that but a single specimen of each has been found ; while 

 of the whole great class of Echinodermata, which existed in such vast numbers, 

 and presented such an infinite variety of beautiful forms, during these epochs in 



