BIBLIOGRAPHY OF PALAEOZOIC CRUSTACEA. 181 



12 Segments: Tril. hojfii Schloth. Ent. scarabceoides Wahl. 



11 Segments: After all the observations made, the Trilobites which have 

 11 thorax segments are generally provided with large eyes composed of 

 a reticulated comae, and form, without any known exception, a very nat- 

 ural group. Tril. macrophthalmus Brong. Calymene bufo Green, C.microps 

 Green, C. diops" Green, C. variolaris Brong. Tril. caudatus Briinn. 

 Asaphus wetherilli Green. Calymene scleops Dalm. Asaphus mucronatus 

 Brong., A.selenurus Eaton. Calymene arachnoides Hon. , C. anchiops Green. 



10 Segments: Tril. esmarkii Schloth. Calymene concinna Dalm. As- 

 aphus dalmani Goldf. Otarion diffractum Zenk. 



9 Segments: Asaphus centrotus Dalm. 



8 Segments: The Trilobites with this number of segments form a very 

 natural group. Their glabella is smooth, distinctly separated from the 

 cheeks. Segments deeply grooved. Tril. conigerus Schloth. Asaphus 

 angustifrons Dalm., A. frontalis Dalm. Cryptonymus schlotheimi Eichw., 

 C. weissi Eichw., C. panderi Eichw., C. lichtensteinii Eichw. Isotelus gigas 

 Dekay, /. megalops Locke, 7. stegops Green, /. planus Green. Asaphus 

 loeviceps Dalm., A. palpebrosus Dalm., A. armadillo Dalm., etc. 



7 Segments: Asaphus buchii Brong. Ogygia guettardi Brong., 0. des- 

 marestii Broug. 



6 Segments: Asaphus granulatus Wahl. Tril. dalmani Boeck. As- 

 aphus nasutus Dalm. Cryptolithus tessellatus Green. 



4 Segments: Triarthrus beckii Green. 



Without Segments: Agnostus. 



14 Segments: Tril. sulzeri Schloth. Calymene tristani Brong. Entom. 

 gibbosus Wahl. Asaphus tetragonocephalus Green. Dipleura. 



Number not determined: Entom. paradoxissimus Linne. Paradoxides 

 longicaudatus Zenk., P. pyramidalis Zenk., P. latus Zenk. Tril. gracilis 

 Boeck. Entom. spinulosus Wahl. Tril.problematicus Schloth., T.bitumin- 

 osus Schloth. 



Rafinesque (C. S.) Prodrome de 70 nouveaux generes 

 decouverts dans Etats Unis. 



In Jour, de Physique de Chemie His. Nat., Paris, vol. 88, 1819. 

 Dr. Green gives the following list of Trilobites from this article: Trilo- 

 bites cephaleury a, T. simia, T. granulata. Bilobites lumulata, B.lobata. 



On the genera of fossil Trilobites or Glomerites 



of North America. 



In Atlantic Jour, and Friend to Knowledge, vol. 1, 1832, p. 71. 



The author states that he was among the first to call attention to the 

 Trilobites of North America. In 1817 Dr. Shaeffer presented to the Lyceum 

 of New York a fossil from the Catskill mountains, which the author de- 

 scribed as a new genus of fossil Entomostraca, under the name of Glom- 

 erites eurycephala, in a paper read before the society. 



