444 NEW VOKK STATIC MUSEUM 



D i p 1 o g r a p t u s tricornis Lapworth. Cat. West. Scott. Foss. 1876. t. 2, 



fig- 39 

 Diplograptus tricornis Lapworth. Belfast Xat. Field Club Rep't & Proc. 



Ser. 2, v. 1, pt 4, apx. 1877. p. 132; pi. 6, fig. 10 

 Cryptograptus tricornis Lapworth. Ann. & Mag. Xat. Hist. Ser. 5. 



1880. 5:171 ff; pi. 5, fig. 2jcL-2-je 

 Diplograptus marcidus Walcott. Alb. Inst. Trans. v. 10, 1883. 



(Advance sheet. 1879. p.34) 

 Diplograptus marcidus ? Whitfield. Jour. Sei. Am. Ser. 3. 1883. 



26 1380 

 Cryptograptus tricornis Lapworth. Roy. Soc. Can. Proc. & Trans. 



1887. 4:177 

 C r y p t o g r a p t u s tricornis Lapworth. Can. Geol. Sur. Rep't 1887-88. Ser. 



2. 1889. v. 3, pt 1, P.95B 

 Diplograptus tricornis Ami. Can. Geol. Sur. Rep't 1887-88. Ser. 2. 



1889. v. 3, pt 2, P.50K, 117K 

 Cryptograptus marcidus Dodge. Am. Jour. Sci. Ser. 3. 1890. 40:153 

 Diplograptus marcidus Walcott. Geol. Soc. Bui. 1890. 1 ^39 

 Non Cryptograptus tricornis Gurley. Ark. GjoI. Sur. An. Rep't. 



1892. 3:415 

 Cryptograptus tricornis Gurley. Jour. Geol. 1896. 4:298 

 Cryptograptus tricornis Elles. Geol. Soc. Quar. Jour. 1898. 54:527 

 Cryptograptus (Idiograptus) tricornis Perncr. Etudes sur les 



Grapt. de Bohcme. Ilieme partie. 1895. P- 2 ^; pi- 7, fig- 7-10 ' 

 Cryptograptus tricornis T. S. Hall. Roy. Soc. Victoria Proc. 1905. 



v. 18, pt 1, p. 2 1 

 Cryptograptus tricornis Ami. Geol. Sur. Can. Sum. Rep't 1904. 1905. 



p. 12 

 Cryptograptus tricornis T. S. Hall. Geol. Sur. Victoria Rec. 1906. 



v. 1, pt 4, p. 275 



Description. Rhabdosome short, rarely more; than 25 mm long and 

 mostly shorter, narrow, of nearly uniform width throughout (1.5 mm), of 

 rigid appearance, provided with four straight or slightly curved spines at 

 the sicular extremity. Sicula large (2.7 mm) ami broad, furnished with a 

 strong apertural ring ami four spines. Thecae tubular, numbering 10 to 1 1 

 in 10 mm, little inclined (angle of divergence 20 ), overlapping one third to 



