GRAPTOLITES OF NEW YORK, PART 1 C41 



wider angle of divergence of the branches, in the somewhat closer arrangement 

 and smaller angle of inclination of the thecae ; in all other characters it agrees 

 closely with that form. The British species occurs in a lower horizon than 

 B . 1 a p w o r t h i . 



Bryograptus pusillus sp. nov. 



Plate 1, liifiiies 21, S2 



Bryograptus kjerulfi (Lapworth) Ruedemaun. N. Y. State Paleontol. An. 

 Rep't. 1902. p.556 



This species is represented hy a single, well preserved specimen foimd on 

 a slab from graptolite bed 2 (Tetragraptus bed). 



Description. Rhabdosome small (0 inm long excluding the nema) 

 consisting of a compact group of dependent branches. It begins with a 

 long, delicate nema, to which a large relatively broad sicula (1 mm long) 

 is attached. From this originate two primary branches at an angle of 

 about 50°, each of which bifurcates into two secondar\' branches. The 

 innermost of these divide again 1)elow the next theca. The earlier bifurca- 

 tions take place symmetrically. The thecae which are disposed along tbe 

 inner margins of the branches are long and narrow, four times as long as 

 v/ide, slightly curved; they number 10 in lOnmi; overlap apparently not 

 more than one fourth of their length, and form an angle of about 15° with 

 the axis of the branch. The aperture is slightly concave ; the apertural 

 angle has not been accurately determined, but is larger than 90°. 



Position and localities. A single specimen has been found on a slab of 

 graptolite bed 2 with Tetragraptus c a d u c e u s . 



Remai-hs. This form in its habit and specially in its mode of branch- 

 ing is a diminutive example of B . kjerulfi. I had, for this reason, 

 originally refeiTed it to that species, considering it a belated mutation of 

 the same [1902, p.556j. The elaborate descriptions by Miss Elles and 

 the exact drawings by Miss Wood, however, which have meanwhile 

 appeared in the Monograph of the British Graptolites, allow a more con- 

 clusive comparison of our excellentl}' jireserved specimen with the European 

 material of B . kjerulfi. Hy this we find that it differs from the latter 



