HUDSON RIVER BEDS NEAR ALBANY 573 



behind the beak; both connected ventrally from the beak by a 

 slight impression, causing the beak to project more strongly in 

 casts. 



Muscle impressions and the character of the hinge have not 

 been observed. 



Dimensions. Largest specimen: length 12.3 mm, hight 6.6 mm, 

 thickness 1.8 mm.; another specimen measured respectively 

 8x5x1.5 m; another 9x5.3x1 mm; a fourth 8.6x5.5x2 mm. 



This form, which belongs to the peculiar and not yet fully 

 understood Siluric group of lamellibranchs, for which S. A. Miller 

 {North American geology and paleontology, 1889. p. 514) introduced 

 the generic name Technophorus, and of which E. O. 

 Ulrich described several species, has its nearest relative in 

 Technophorus subacutus, Ulrich from the upper part 

 of the Trenton limestone of Minnesota, which, however, is known 

 only in casts ; the casts of the two species differ materially in the 

 charater of the beaks, in the cardinal and general outline. Our 

 species differs from all other congeneric forms whose surface 

 sculpture is known, by its cancellate surface. 



Upper Utica shales of northern Green Island, Albany co. N. Y. 



§ 3 ANNELIDA 



Certain layers of the Utica graptolite shales of the Rural ceme- 

 tery near Albany are profusely covered with worm-shaped car- 

 bonaceous films. The actual presence of organic matter, the 

 uniform dimensions of certain types and the distinct terminations 

 of the fossils leave no doubt that they represent not mere tracks 

 but actual bodies of animals. Two types could be made out of 

 sufficient perfection to warrant their being named and described. 



Eopolychaetus albaniensis gen. no v. et spec. nov. 

 {see pi. 1, fig. 13) 



Head distinctly separate from the body, semicircular, with a 

 median oval depression which extends a little on the first body 

 segment. 



