54 



discoverer and descri))er, Dr. K. N. S. Riiiiiuebcri?, was named D. minor* 

 This name being iire-occiijiied, I), riii^iichcri^i was substituted for it ])y 

 Newlx-rry.T In 1886, Dr. Herbert Ujjham Williams described and 

 figured two new species, both of the genus Pala.'onisciis De BlainYille.i 

 These were P. riticulatvs H. U. Williams and P. nntiqinis H. U. Wil- 

 liams. With these were found remains of, ])robably, Dinichthys n'ligae- 

 hcrgi Newberry ( D. m/nor Ringueberg). Since that time a number of 

 remains have come to light from these shales, § among which the follow- 

 ing mav be mentioned: 1. — A specimen showing both rami of the 

 mandible of a Dinichthys, which may be referred to D. minor Newberry 

 with a good deal of reservation, since the terminal portion is com])letely 

 crushed, and beyond the recognition of the characteristic features. Its 

 size is intermediate between that of D. minor Newb. and that of D. 

 newberryi Clarke. 2. — A specimen of an undescribed Diuicbtliys, con- 

 siderably weathered. 3. — A si)ecimen which appears to be the terminal 

 tooth of D. minor Newb., but smaller than the usual form. Besides 

 these there are specimens referable to Mylostoma variabilis Newberry, 

 Callognathus serratus Newberry, and a large scale which appears to 

 belong to a species of Holoptychius, btit further examination may result 

 in placing it in a new genus. These remains of fishes are not found in any 

 great abtmdanee. They have to be carefull\' looked for over a consider- 

 able area at Sturgeon Point, and they are found most frequently asso- 

 ciated with two species oi Lingula — L. concentrica Conr., (probably a 

 variety of Schizobolus truncatus Hall) and L. spatulata Vanux., with 

 Goniatites, Lepidodendra, Calamites and Conodonts. The larger 

 specimens of fish remains are usually so much weathered, that their 

 identification becomes, if not impt)ssible, yet a matter of extreme 

 difficulty." 



Be\'ond Sturgeon Point the shale disappears again, and 

 unconsolidated material takes its place. In many places the 

 bank is low, and largely composed of sand dunes, in others 

 it is a sand and clay cliff, which bears evidence of being 

 constantly eroded by the waves. Trees and shrubs have 

 slid down the bank, and are now growing from it at all 

 angles. 



At "Dibble Point," beyond the mouths of the Sister Creeks, 

 the shales appear again in a low cliff. They var^^ in color 

 from dark gra\' to black, and are full of septaria, most of 



*Atn. Joiirn. Science, Vol. 27, p. 476, 1884. With figures. 



tThe Palfeozoic Fishes of North America by J. S. Newberry. Men. X\'I., U. S. 

 Geol. Surv.. p. 60. 



JBitU. Buff. Soc. Nat. Sciences, Vol. V., No. 2, pp. 81-S4; one plate. 

 §Mainly through the labors of Mr. Mixer himself. 



