No. 8.] SPENCER — GRAPTOLITES. 463 



Genus Callograpsus, Can. Org. Rem. Dec. II. 



Callograpsus Niagarensis, n. s. 



Frond flabellate ; the slender bifurcating branches more or 

 less parallel with occasional transverse filaments. The form is 

 nearly semicircular with the branches radiating from a common 

 axis. In texture it is corneous and the surface of the numerous 

 flattened branches is marked with striations, appearing like oval 

 impressions, while on the under side there are minute pits in- 

 dicating the apertures of the cells, as many as twenty pits being 

 visible in one-fourth of an inch. The fronds are usually less than 

 two inches in breadth, and resemble the outline of a bush, where 

 the branches principally originate from the root. 



This species is easily distinguished from Dictyonema by the 

 bush-like form and more slender branches, together with an 

 almost entire absence of dissepiments and cell markings. In 

 the better preserved specimens, the cells readily distinguish it 

 from Dendrograpsus, as also the more numerous and more parallel 

 branches. The branches are broader, more drooping and further 

 separated than in the species of this genus found in the Quebec 

 Group. 



Besides the species described above the writer has observed 

 several species of Dendrograpsus and others, which he hopes to 

 publish at an early period with plates, aud more particulars of 

 their modes of occurrence and sreneral structure. 



