BIBLIOGRArHY OF PALAEOZOIC CRUSTACEA. 181 



12 Segments: Tril. hoffii Schlotli. Ent. scaralxeoides 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 cornfe, and form, without any known exception, a very nat- 

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

 Green, C. diops Green, C var'tolaris Brong. Tril. caudatus Brtinn. 

 Asaphus wetherilli Green. Calymene scleops Dalm. Asaj^htis mucronaius 

 Brong., A. selenurus 'Eaton. Calymene arachnoides'KoTi., C. aiichiojjs Gveen. 



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

 aphus dalmani Goldf. Otarion difractum Zenk. 



9 Segments: Asaphus ceniroiiis Dalm. 



8 Segments: The Trilobites with this ni;mber of segments form a verj' 

 natural group. Their glabella is smooth, distinctlj- separated from the 

 cheeks. Segments deeply grooved. Tril. conigerits Schloth. Asajjhus 

 angustifrons T)a\m., A. frontalis Dalm. Cryptonymus schlotheimi Eichw., 

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

 Dekaj', /. megalops Locke, /. stegop>s Green, /. ijlanus Green. Asaphus 

 keviceps Dalm., A. palpebrosus Dalm., A. armadillo Dalm., etc. 



7 Segments: Asaphus huchii 'Bvong. O gygia guettardi Bvong., O.des- 

 marestii Brong. 



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

 aphus nasidus Dalm. Cryptolithus tessellatus Green. 



4 Segments: Triarthrus heckii Green. 



Without Segments: Agnostus. 



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

 yihhosus'^aDil. Asaphus tetragonocephalus Green. Diptleura. 



Number not determined: Entom. j)o,radoxissimus Tiinn^. Paradoxides 

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

 Boeck. Entom. spi7iulosus Vlah.1. 7'ril.problematicus Schloth., T.hitumin- 

 osus Schloth. 



Rafinesque (0. S.) Prodrome de 70 nouveaux generes 

 decouverts dans Etats Uiiis. 



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 cephaleurya, T. simia, T. granulata. Bilobiteslumulata, B.lohata. 



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. Shteffer presented to the Lyceum 

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

 scribed as a new geni;s of fossil Entomostraca, iiuder the name of Glom- 

 erites eurycephala, in a paper read before the society. 



