I40 NEW YORK STATE MUSEUM 



Nileus: armadillo, Schmidt, no. 27, Lief. Ill, pi. 8, fig. 13 (with 



pit and long crest) ; Moberg and Segerberg, no. 10, pi. 6, fig. 1 ; 



perkinsi Raymond, no. 18, pi. 2, fig. 8 (shows tubercle on interior 

 mould). N. affinis, ibid, pi. 4, fig. 4. 

 Niobe: Schmidt (no. 27, Lief. Ill, p. 10) states that the tubercle is present 



in all representatives of the genus hut is very fine. It is well shown 



in N . in sign is, Moberg and Segerberg, no. 10, pi. 6, figs. 6, IO; 



11; laeviceps, ibid, fig. 17. 1 



Ogygites: canadensis, Raymond, no. 18, pi. 1, fig. 2. 

 Onchometopus: volborthi Schmidt, no. 27, Lief. II, p. 82, . fig. 



48; obtusus, Raymond, no. 18, pi. 3, fig. 2; simplex, Raymond 



and Narraway, no. 15, pi. 16, fig. 6, 

 Phacops: fugitivus, Barrande, no. 1, suppl., pi. 9, fig. 2 ; b r o w 11 i , 



two specimens in Museum from Darnel, Bohemia, showing small tubercle 



on posterior top of glabella ; schlotheimi, specimen in State Museum 



from Gerolstein, Germany, with large tubercle. 

 Pseudasaphus: globifrons, Schmidt, no. 27, Lief. Ill, pi. 7, 



figs. 2, 3, 4; testicaudatus, ibid, pi. 1, fig. 1; pi. 2, fig. 3; pi. 3, 



figs. 1, 10. 

 Ptychopyge : excavato-zonata, Schmidt, no. 27, Lief. I, p. 



30, fig. 5 ; limbata, ibid, p. 31, fig. 6 ; 1 a r o w i , ibid, p. 31, fig. 7 ; 



angustifrons, Schmidt, no. 27, Lief. Ill, pi. 5, figs. 4, 7 ; t r u-n - 



c a t a , ibid, pi. 6, fig. 5 ; pahleni, ibid, pi. 6, figs. 2, 10, n ; c i n c t a , 



ibid, pi. 8, .figs. 1, 2. 

 Remopleurides :. radians, specimen in State Museum from 



Chodoun, Bohemia, interior cast with tubercle on center of glabella. 

 S a 1 1 e r i a : p r i m a e v a , Reed, no. 22, pt 1, pi. 4, fig. 13. 

 Symphysurus: convexus, Raymond, no. 17, pi. 14, fig. 14; (see 



our pi. 36, fig. 2); sicardi, ibid, pi. 14, fig. 17; angustatus, 



Moberg and Segerberg, no. 10, pi. 5, fig. 15. 



9 As a last argument in favor of the presence of a median eye 

 in the trilobites, we cite the fact that the trilobites are recognizedly 

 primitive crustaceans, most frequently considered as related to the 

 phyllopods, and that primitive crustaceans, notably the phyllopods 

 and most other branchiopods, possess parietal or median eyes. It 

 is interesting to note in this connection that Kingsley (no. 9, p. ,34.) 

 in a note on the systematic position of the trilobites, states that if 

 the protaspis stage of the trilobites described by Beecher is a true 

 nauplius, it should have the median eye, which is never lacking in 

 the nauplius. Against this Beecher (ibid, p. 40) remarks that the 

 protaspis stages are so minute that even under the most favorable 

 conditions they could not be expected to show such small features 

 as ocelli. We believe that the tubercle figured by Beecher in the 

 protaspis stage of Trinucleus is 1 the ocellus in question. Patten 

 even calmly assumes with complete assurance that the trilobites 

 had median eyes, whether paleontologists found them or not, for 



