I46 NEW YORK STATE MUSEUM 



CALLOGRAPTUS Hall 



See N. Y . State Mus. Mem. 7, p. 583 



Callograptus compactus ( Walcott) 



Plate 1, figure 1 



Dendrograptus compactus Walcott. Albany Inst. Trans. i88i.- 10:21, pi. 1, 



fig. 1 

 Dendrograptus compactus Gurley. Jour. Geol. 1896. 4:94 



Description. Rhabdosome of small size (length of largest specimen 

 observed 40 mm), consisting of a basal disk with a short stem (5 mm) and 

 the frond which is probably infundibuliform. The branches assume at once 

 a subparallel direction, are straight or gently undulating, .3 mm -.4 mm 

 wide, separated by intervals twice their width and con- 

 nected by widely separated dissepiments. The thecae are 

 rather indistinct and but little projecting, without apertural 

 appendages, of composite character and numbering 12-14 

 in the space of 10 mm. 



Position and localities. This species has thus far been 



Fig. 52 Callograp- 



Jur s i c°mpactus found only in its type locality, i. e. in the Utica shale at 



(Walcott). Fragment of J ■ ' i ■ ' 



branch showing form of tj i , 1 r> <. C\ - 1 XT \ r 



thecae. x 5 Holland ratent, Oneida co., IN. \. 



Remarks. Walcott has described the form as fan-shaped J but the 

 crowding and overlapping of the branches on one side of the frond in the 

 specimen here figured suggests the possibility of an original infundibuliform 

 shape. The basal disk is stout, of irregular shape and outline and shows 

 obscure marginal lappets. The general form of the rhabdosome, especially 

 the subparallel arrangement of the branches, and their connection by a few 

 scattered dissepiments, are characters of Callograptus, apparently not shown 

 in the type of the species which according to Walcott is much weathered. 

 Although the original diagnosis of Calloo-raptus calls for " llabellate fronds," 

 this statement is qualified in the last supplementary remark [Hall, 1865, 

 p. 133I, and the probable infundibuliform shape ol this species is not 

 antagonistic to its reference to that genus. 



'The original description is : Frond fan-shaped ; branches comparatively coarse ami 

 numerous; stipe below the branches unknown. 



