GRAPTOLITES OF NEW YORK, I'ART 2 



4«5 



In the present paper a species is described as Azygograptus ? 

 simplex which formerly had been identified by the writer with Daw- 

 sonia campanulata Nicholson. The subject of this note consists of 

 small appleseed-shaped carbonaceous bodies [see fig. 467, 468] which occur in 

 a thin band of the Normanskill shale at Schuylerville, Saratoga co. They 

 are in shape and size almost identical with D. acumi n at a 'Nicholson ; 

 but belonging to a younger horizon (I ) . acuminata is from the Beek- 

 mantown shale at Point Levis), they could not well be identified with the 

 latter. They begin with a rather sharply pointed proximal spine or radicle, 

 which is attached to the nar- 

 rower end of a small oval 

 body. The latter is broadly 

 rounded at its distal extrem- 

 ity. The length of the 

 bodies is about 3 mm in the 

 majority, 1 mm of which is 

 taken up by the spine. Their 

 substance is carbonaceous, 

 but lacks all growth lines and 

 is notably thinner than that 

 of the graptolites and also 

 lacks the gloss of the latter. They are not associated with graptolites 

 but with branching carbonaceous bodies [see fig. 468] which have the form 

 of sponges and may be remains of either horny or calcareous sponges, the 

 calcareous portion of whose skeletons has been dissolved. 



Since bodies apparently connecting the " Dawsoniae " with the larger 

 multitubular organisms occur in the same band [see fig. 467] the inference 

 that these " Dawsoniae " are young growth stages of the latter suggests 

 itself, though it must be remarked that the material is not complete enough 

 to be conclusive. For the sake of reference we propose to name the mature 

 form Graptospongia pusilla. 



467 



468 



Fig. 466 Dawsonia acuminata Nicholson. Copy from Nichol- 

 an. Fig. 467, 468 Graptospongia pusilla gen. no v. et spec, no v. 



