

XX 11 



SYNOPSIS OF GENERA. 



1843 , s Mem. Geol. Surv. United Kingdom, Decade ii. 



. M Cot. Ami. and Mag. Nat. Hist., vol. iv. 

 V) - p. Pal. 1 '■'■ I ivardian Mus. 



1852, ••■ - Sil. d. B ifime, vol. i. 



1852. ' 1. Surv. Wis., Iowa and Minn. 



1S55. , Si hard. 1 :■■] >t. Geol. Surv. Missi 



. Emmons. Amer can I teology. 

 1858. 'art. Jour. Geol. Soc 



. Hall. Thirteenth Rept. N. V. State Cab. Nat. Hist. 



1861. Call .llii. pt. Wisconsin. 



1862. ■ , lIcCoi -; : Sil. Foss. [reland. 

 1862. Calymt w. Hall. Fifteenth Rept. X. V. State Cab. Nut. Hist. 



i br. Monog. Brit. Trilobites. 

 i .Salter. Mem. j United Kingdom, 



is,;; Calym e, Hall. Twentieth Rept. N. Y. State Cab. Nat. Hist. 



Ve i. camb. och. silur. Aflag. 



. Haidbnhain. Zeitschr. ,1. deutsch. geol. Gesellsch. 

 ls;j. (, , Babrande. Syst. Sil. d. Boheme, vol. i, suppl. 



l-~7:i. Calymene, Mbbe. Geol. Surv. Ohio, Palaeontology, vol. i. 



Is;;,, i a lynu te. Meek. 1. Surv. Ohio, Palaeontology, vol. ii. 



1876. Calymt i£, Hall. Illustration ,t Devonian Fossils. 



n.r:i palseo 

 1878. ' , Angblin. Pal. Scandinavica, pt. i. 



1879 i , Ui an h. Jour. Cin. Soc. Nat. Hist., vol. ii. 



[879 , Novak. Studien an Hypostomen, i. 



Proc. Acad. Nat. Sci. Phil. 

 1881. ■ Hall. Eleventh Rept. Geol. Surv. Indiana. 



lssi. ( ':; , Wai ott. Bull. Mus. Comp. Zoology, Harvard Coll. 



. Novak. Zur Kenntn. bohmisch. Trilob. 

 1SS4. ' '. vak. Studien an Hypostomen, ii. 



L885. Calymene, Zittel. Handb. d. Palaeontologie. 

 1885, Calymene, QShlert. Bull, de la Soc. d'Etudes scientif. d'Angers. 

 1887. ■ Foerste. Bulletin, Denison University. 



Diagnosis. Body oval. Cephalon semicircular, 

 nearly three times as wide as long; rounded in 

 front, genal angles blunt, rarely produced into 

 spines. Anterior margin somewhat elevated ; gla- 

 bella strongly arched, sharply limited by deep dor- 



. and divided into three pairs of sub-spherical lobes, by the unequal, 

 short lateral furrows, the posterior pair of which bifurcate near their proximal 

 extremities. Cheeks convex, and with a distinct marginal border. Eyes situated 

 somewhat anteriorly ; visual surface small, homocorneal. The facial sutures 

 begin at the genal angles, and pass in a sigmoid curve to the eyes, thence, 

 parallel to the axis, to the anterior margin, where they are united by the 



