BIBLIOGRAPHY OF PALEOZOIC 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. 



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



Olenelhin asaphoides Emm . Paradoxides sirinosus Boeck, P . pusillus Barr., 

 P. inJlatuH Cord., P. tessini Brong., P. kjerulfi Linrs. Hydrocephaluft 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 metamorphic limestones of the Taconic series 

 of Emmons, at Canaan, New York. PI. 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 grimbnrgi n. sp . Cheirurus quenstedti Ban*., C quenstedti mut. 

 nov. prifcnrsor. Kvrrivvrvs novril-i n. sp. Ehicrhrurirs- sp. ? Arffhnsina 

 haueri n. sp. 



Die palaozoischen Bildungen von Cabri^res, 



etc. 



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



Brontt'us meridionalis Trom. Grass., B. rouvillei n. sp., B. siibrampani/er 

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

 Huprade vonicn, P. occitanicus Trom. & Grass., P. escoti n. sp., P. cf. 

 late septal us. Cheirurus gibhus. L ic has meridionalis n. Hip. Proetns cuvieri ?, 

 P. compla»atus var. P. aff. jdanicaudn' . Harpes rouvillei u. sp. 



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

 ensis petrifactis. Spec. I! Trilobites f. Ento tnolithus 

 paradoxus Linne. Lipsise, 1793 (1 pi.) 



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

 ures several specimens of Calymene blumenbachii . 



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

 Dresden, 1846, 28 pis. 



The Trilobites are arranged into 19 families, as follows: 

 1. Calymene Brong. f'.4»i/)A70w and Ze<A?<s Pander). C. blumemharhii, 

 C. triUani, C. ]>oli/(oma, C. callicephaln . 



