BIBLIOGRAPHY OF PALAEOZOIC CRUSTACEA. 69 



On additional embryonic forms of Trilobites 



from the Primordial rocks of Troy, New York, with 

 observations on the genera Olenellus, Paradoxides, and 

 Hydrocephalus. 



In Am. Jour. Sci. 3d series, vol. 22, 1881, p. 250, 13 figs. 



Olenellus asaphoides Emm . Paradoxides spinosus Boeck, P.pusillus Barr., 

 P. infiatus Cord., P. tessini Brong., P. kjerulfi Linrs. Hydrocephalus carens 

 Barr. Olenellus thompsoni Hall, 0. vermontanus Hall. 



- and Dwight (W. B.) Preliminary report of 

 S. W. Ford and W. B. Dwight upon fossils obtained in 

 1885 from rnetamorphic limestones of the Taconic series 

 of Emmons, at Canaan, New York. PL 7. 



In Am. Jour. Sci., 3d series, vol. 31, 1886, p. 248. 

 Genal spine of Trilobite, perhaps Asaphus megistos. 



Freeh (Fritz). Ueber das Devon der Ostalpen. 



In Zeitschr. Deutsch. geol. Gesell., Berlin, vol. 39, 1888, p. 659. 



Phacops grimburgi n. sp. Cheirurus quenstedti Barr., C. quenstedti mut. 

 nov. precursor. Encrinurus novaki n. sp. Encrinurus sp. ? Arethusina 

 haneri n. sp. 



Die palaozoischen Bildungen von Cabri^res, 



etc. 



In Zeitschr. Deutsch. geol. Gesell., Berlin, vol. 39, 1887, p. 360, pi. 24. 



Bronteus meridionalis T^>ni. Grass., B. rouvillei n. sp., B. subcampanifer 

 n. sp., B. dormitzeri 1 Phacops fecundus Barr., P. fecundus mut. nov. 

 suprade vonica, P. occitanicus Trom. & Grass., P. escoti n. sp., P. ct, 

 tnt'septatus. Cheirurus gibbus. Lichas meridionalis n.sp. Proetus cuvieri ?, 

 P. complanatus var. P. aff. planicaudce. Harpes rouvillei n. sp. 



Gehler (J. C.) De quibusdarn rarioribus agri Lipsi- 

 ensis petrifactis. Spec. I. Trilobites f. Entomolithus 

 paradoxus Linne. Lipsiae, 1793 (1 pi.) 



The author gives a sketch of the bibliography of the Trilobites, and fig- 

 ures several specimens of Calymene Uumenbach'ti. 



Geinitz (H. B.) Grimdriss der Versteinerungs-Kunde. 

 Dresden, 1846, 28 pis. 



The Trilobites are arranged into 19 families, as follows: 

 1. Calymene Brong. (Amphion and Zethits Pander). C. bhtmembachii, 

 C. trislani, C. polytoma, C. callicephala. 



