. Annual report . Victoria, decade 1. 1874. , , Tetragraptus quadribrachiatus Etberidge jr. Ann. and Mag. Nat. Hist. ser. 4. 1874. 14:3, , quadribr a c h i a t u s Hopkinson & Lapworth. Quar. Jour. Geol. Soc. 1875. 31:649, , %.9a, 9bTetragraptus quadribrachiatus Linnarsson. Sver. Geol. Und. 1879. Afh. och upps. ser. C, , quadribrachiatus Brugger. Die sil. Etagen 2 and 3. 1882. quadribrachiatus Tornquist. Sver. Geol. Und. 1883. Afh. och upps. ser. C, , quadribrachiatus Herrmann. Quar. Jour.
. Annual report . Victoria, decade 1. 1874. , , Tetragraptus quadribrachiatus Etberidge jr. Ann. and Mag. Nat. Hist. ser. 4. 1874. 14:3, , quadribr a c h i a t u s Hopkinson & Lapworth. Quar. Jour. Geol. Soc. 1875. 31:649, , %.9a, 9bTetragraptus quadribrachiatus Linnarsson. Sver. Geol. Und. 1879. Afh. och upps. ser. C, , quadribrachiatus Brugger. Die sil. Etagen 2 and 3. 1882. quadribrachiatus Tornquist. Sver. Geol. Und. 1883. Afh. och upps. ser. C, , quadribrachiatus Herrmann. Quar. Jour. Geol. Soc. 1886. ser. 3, 3:18Tetragraptus quadribrachiatus Barrois. Ann. de la Soc. Geol. du Nord. 1892. 20:95 Tetragraptus quadribrachiatus Matthew. Roy. Soc. Can. Trans, and Proc. 1893. 11:114 Tetragraptus quadribrachiatus Gurley. Jour. Geol. 1896. 4:295Tetragraptus quadribrachiatus Roemer & Freeh. Lethaea palaeozoica. 1897. 1:603Tetragraptus quadribrachiatus Elles. Quar. Jour. Geol. Soc. 1898. 54:485. 646 NEW YORK STATE MUSEUM T e t r a g r a p t u s quadribrachi a t n s Ruedemann. N. Y. State Paleontol. An Rept. 1902. q n a d r i b r a c h i a t u s Elles & Wood. Monogr. Brit. Grapt. ptl. 1902. , , Description. Primary disk and nema not observed. Sicula present,but observed only in sections. Branch of first order mm long, consist-ing apparently of two thecae on either side. Four branches of the secondorder, which are spread out horizontally; straight, slender, rigid, increasing very gradually from a width of . 6 mm to oneof mm, attaining a maximal length of42 mm. Thecae 8 to 9 in 10 mm, inclined at alow angle (about 35-40°), narrow (four timesas long as wide), overlapping for one half toone third of their length. Outer wall slightlycurved. Apertural margins straight or slightlyconcave, normal on the axis of the thecae. Fig. 51 Tet rag-rapt us quadri- somechDaeei,, ^oung rhaMo Position and localities. In the Deep kil
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