BIBLIOGRAPHY OF PALAEOZOIC CRUSTACEA. 181 



12 Segments: Tril. hoffii Schloth. Ent. scarahceoides Wahl. 



1 1 Segments: After all the observations made, the Trilobites which have 

 11 thorax segments are generally provided with large eyes composed of 

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

 ural group. Tril. meter ophthalvius Brong. Calymene bufo Green, C. microps 

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

 Asaphus icetherilU Green. Calymene scleops Dalm. Asaphus mueronatus 

 Brong., ^.seZenwrMS Eaton. Calymene arachnoides 'Hon., C. anchiops Gieen . 



10 Segments: Tril. esmarkii Schloth. Calymene concinna Dalm. ^s- 

 aphus dalmani Goldf. Otarion diffractiun Zenk. 



9 Segments: Asaphtts 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. froiitalis'Da.lm.. Cryptonymus schlotheimi Eichw., 

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

 Dekay, /. megalops Locke, /. stegops Green, /. jjlanus Green. Asaphus 

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



7 Segments: Asaphus buchii Bvong. gygia gueitardi Bvong., O.des- 

 marestii Brong. 



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

 aphtts nasutus Dalm. Cryptolithus tessellatus Green. 



4 Segments: Triarthrus heckii Green. 



Without Segments: Agnostus. 



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

 gibbosus Wahl. Asaphus ieiragonocephalus Green. Dipleura. 



Number not determined: Entom. j^aradoxissimus Ijinn^. Paradoxides 

 lo7igicaudatus Zenk., P. pyramidalis Zenk., P. latus Zenk. Tril. gracilis 

 Boeck. Entom. spimdosus Wahl. IVil.problemalicus 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 cephalettrya, T. simia, T. granulata. Bilobites lumtilata, 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. Shajffer 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 pajier read before the societ3\ 



