NO. 1192. TRENTON FAUNA OF BAFFIN LAND— SCHUCHEBT. 173 



POTERIOCERAS, species undetermined. 



There is a poor specimen of this genus from the Frobislier Bay 

 locality. It was thought to be a small specimen of P. nobile, and was 

 therefore sent to Professor Whiteaves^ for comparison. He, however, 

 writes : 



We have nothing exactly like this. It is very similar in shape to P. nobile, except 

 that the latter is somewhat compressed and yours is not. The difference in size 

 between your specimen and ours is, of course, enormous. Your shell also is not very 

 unlike the so-called Gomplioceras eximium Billings, but that species is ovate in trans- 

 verse section, possibly from lateral pressure. Your specimen is, I should think, most 

 likely a Potcrioceras, but too imperfect to show its specific characters or affinities. 



Collector.— J. N. Carpender. Cat. No. 28122, U.S.N.M. 



Family TAEPHYCERATIDiE Hyatt. 



EURYSTOMITES PLICATUS Whiteaves ? 



Eurystomites plicatus Whiteaves, Can. Eec. Sci., VI, 1896, p. 395; Geol. Surv. 

 Canada, Pal. Foss., Ill, Pt. 3, 1897, p. 225, figs. 15, 16; pi. xxvii, fig. 2. 



The only specimen of this species present is not well preserved, but 

 has parts of one and one-half whorls. Professor Whiteaves, who saw 

 the specimen, writes that it is "probably Eurystomites plicatus White- 

 aves. At any rate, it has the same outline in transverse section, with 

 the dorsum impressed by a shallow and rather narrow furrow of contact, 

 and the same amount of involution." The specimen, however, shows no 

 surface markings nor any siphuncle. 



Collector.— 3. N. Carpender. Cat. No. 28123, U.S.N.M. 



Class ^RTHROI'ODA.. 



Subclass CRUSTACE^A. 

 Order OSTRACODA. 



Ostracoda are abundant at Silliman's Fossil Mount, 10 specimens 

 having been found attached to the larger fossils. These were .sent to 

 Mr. E. O. Ulrich for determination. He has identified them as follows: 



Bythocypris granti Ulrich.^ 



Primitia or Kloedenia. 



Krausella, two new species. 



Order TRILOBITA. 



NILEUS VIGILANS (Meek and Worthen) . 



Nileus rigilans Clarke, Geol. Minn., Ill, Pt. 2, 1894, p. 712, figs. 17-19. 

 Of this widely distributed species there is one very line enrolled but 

 small specimen and fragments of three other individuals. These agree 

 exactly with Mr. Clarke's description and figures. 



•Trans. Royal Soc. Canada, Sec. 4, VII, 1889, p. 77, pi. xiv, fig. 1, 

 ' Geol. Minn., Ill, Pt. 2, 1894, p. 689, pi. xliv, figs. 39-42. 



