,k Ai'Tou its OF x i:w YORK, P \i< I 2 



397 



of (i. q uadrimucr o nat us ; and that also the periderm had a like 

 structure, in short that G. whitfieldi belongs to the same subdivision 

 of Glossograptus as G. q u ad r i m u cro n a t u s. 



The compressed specimens can, as a rule, be readily distinguished from 



those of G. quadrimucronatus by their more slender rhabdosomes 



and the slightly ascending direction of the spines. In regard to the 



"reproductive appendages" of this species, described by Hall, see under 



Lasiograptus. 



Glossograptus ? eucharis (Hall) 



Plate 26, figures iS, 19; 1 late 27, figures 11-13 



R e t i o °- r a p t u s eucharis Hall. Geol. Sur. Can. Can. Org. Rem. Decade 2. 



1865. p. 146; pi. 14, % 9 



349 



350 352 



Fig. 346-52 Glossograptus ? eucharis (Hall) Fig. 346 Copy of original figure. Fig. 347 Lateral view of large 

 rhabdosome. Mechanicville. (s j^l. Fig. 348 Retiograptus aspect of rhabdosome \compa re fig. 346]. Dolgeville. Fig. 

 349-52 Various aspects of rhabdosomes. Fig. 349 External view, shows first th'eca. Dolgeville. Fig. 350 Specimen from 

 Rural Cemetery, Albany. Fig. 351 Specimen from Diplograptus bed, Elgin, la. Fig. 352 Impression of exterior. 

 Mechanicville. Figures 348-52 are x 5 



Retiograptus eucharis Hall. N. Y. State Cab. Nat. Hist. 20th An. Rep't. 



1868. p. 206, 224; pi. 4, fig. 9 

 Retiograptus eucharis Walcott. All). Inst. Trans, v. 10, 1881. (Advance 



sheet. 1879. p. 35) 

 Retiograptus eucharis Ami. Can. Geol. Stir. An. Rep't. pt 11, 1887-S8. 



1889. P.23K, 117K 



