GRAPTOU'lES OF NEW YORK, PART 2 



227 



Remarks. The relations of this species to Inocaulis have been shown 

 in the discussion of the genus. On account of its very fragmentary condi- 

 tion the specimen leaves many points unsettled ; especially is the composi- 

 tion of the branches still shrouded in doubt ; the stem is apparently 

 composed of a dense mass of thecae opening on all sides, but it also shows 

 a thin threadlike axis [see text fig. 120]. The 

 coenosarcal canal of the branches seems to be 

 composed of the narrow, tubular proximal , 

 parts of the thecae. 



The fragment in the Ulrich collection is 

 very distinct, the specimen being jet-black in 

 a light grayish green shale. In this specimen 



° J ° L Fig. 120 Chaunograptus gemmatus 



it appears that the thecae were fairly regularly ' sp -" ov - Enlargement?*^ ^specimen 

 alternating on opposite sides and lying in one plane. Where the branch 

 is compressed in the direction of that plane, a black, nearly uniformly thick 

 band results [see pi. 1 1, fig. 6, 7]. 



Chaunograptus ? rectilinea sp. nov. 



Plate 10, figure 12 



Description. Rhabdosome small (20 111111-30+ mm), repent on foreign 

 bodies, consisting of very fine, nearly uniformly thick (.1 mm— .2 mm), 

 straight or but gently curved, frequently and irregularly, monopodially 

 dividing branches, the latter all forming acute angles (about 30 ). There 

 are no projecting thecae or denticles seen and the thecal apertures appear 

 as fine circular depressions, numbering about 20 in 10 mm. 



Position and locality. The material consists of a sino-le fragment of an 

 apparently undescribed cephalopod, that is covered with the linear carbona- 

 ceous rhabdosomes. It was found by the writer in the Utica shale at the 

 north end of Van Schaick island, Cohoes, N. Y. 



Remarks. The carbonaceous substance, the presence of small pores 

 and the general graptolitic aspect of the organism which is that of a den- 

 droid, similar to Mastigograptus seem to warrant the description of the 

 form in this volume notwithstanding its repent mode of existence. The 



