2 20 NEW YORK STATE MUSEUM 



and substance seems to be congeneric with the pecuHar organism described 

 and figured by Hall as D e n d r ograp t u s (C h au n og r ap t u s) n o v- 

 ellus from the Waldron (Niagaran) fauna [Geol. Sur. Ind. nth Rep't, 

 1881, p. 225, pi. I, fig. I and 2 (before in Alb. Inst. Trans, v. 10, abstract, 

 p. 2, 1879)]. A comparison with the two types of this species in the State 

 Museum, shows that the Gaspe and Waldron forms are specifically different, 

 the Gaspe form being coarser and the apparent cells larger. Since no 

 other form of this still problematic group of supposed repent graptolites is 

 known, the Gaspe form is apparently new. 



Its characters are : Conchiolinous, delicate, frequently and irregularly 

 branching fronds, which are closely attached to foreign bodies and consist of 

 curved, commalike bottle-shaped cells or branch segments, which are 1.4 

 mm long and .3 mm wide in their distal part and bud in such a fashion 

 from the preceding that the branches become slightly zigzag-shaped. 



The systematic position of these remains is very doubtful. By their 

 fixation they stand apart from all other graptolites and though Hall states 

 that D. (Chaunogr.) novellus also occurs free, the attached creeping 

 mode of existence would appear to be the natural state of this form. Since 

 the type of Chaunograptus novellus shows this latter to consist of 

 a continuous tube with pores, as also parts of the Gaspe form do, a reference 

 to the ctenostomatous bryozoans might seem appropriate were it not for the 

 substance of the test which indicates afifinity with the hydroids, Mr Ulrich 

 who has examined the specimens of these species is disposed to exclude them 

 as possibilities among the Bryozoa and Dr Ruedemann with some reservation 

 accepts them as graptolites. 



Locality. Dolbels brook, Grande Greve. 



SPONGES 

 Hexactinellida 



Plates A, B 



Both at Grande Greve and at Shiphead are layers in the upper lime- 

 stones which are matted masses of sponge spicules, for the most part 

 obviously, but in part also, obscurely of the triaxial type. These layers in 

 both places are several inches in thickness but there is no evidence of their 

 continuing over the interval of four miles which separates the observed 

 outcrops. Singularly, the spicule mass at Grande Greve seems largely 

 constituted of the long rods of the supporting skeleton and shows but few 

 cruciform spicules while that at Shiphead carries a very considerable variety 

 of flesh spicules including typical and slightly modified hexactins and some 

 extreme and novel expressions thereof but very few of the long supporting 

 rods. We have in these rock masses the residuary evidence of the breaking 

 down of extensive plantations of silicious sponges. So far as we have 

 observed they have left no impressions of their body form in the sediments 



