42 SAN DIEGO SOCIETY OF NATURAL HISTORY 
Herrick (©. lL.) Observations upon the so-called Waverly Group of 
Ohio. 
Geol. Ohio, vol. 7, 1893, pp. 495-515, plates 14-24, Chapter IV. 
Proetus praecursor Herrick. Phaethonides spinosus Herrick. Phillipsia meramecensis 
Shumard. Proetus minutus Herrick. Phillipsia serraticaudata Herrick. Phaethonides 
immaturus Herrick, P. occidentalis Herrick. Proetus sp. ?, P. auriculatus Hall. 
This chapter is a summary of the results of observations published in the Bulletins 
of Denison University, the American Geologist, and the Bulletins of the American 
Geological Society. 
The plates are from the Bull. Denison University. 
Hind (G. J.) and Fox (H.) On Radiolarian rocks in the Lower 
Culn. 
Quart. Jour. Geol. Soc., vol. 51, p. 609. 
Trilobites by Dr. Henry Woodward, pp. 646-649. 
Phillipsia Leei Woodw., P. minor Woodw. Phillipsia larval form. 
Griffithides acanthiceps Woodw., G. longispinus Portl. Proetus species A-B. 
Hitchcock ((. H.) Notice of a new species of Acidaspis from a 
boulder of Marcellus shale found in drift at West Bloomfield. New 
Jersey. 
Bull. Am. Mus. Nat. Hist. vol. 19, 1903, pp. 97-98, plate 6. 
The author describes 4cidaspis Whitfeldi n. sp., which he compares with Acidaspis 
mira Barr., but the new species is rather more complicated in the distribution of the 
spines. 
Hochsteetter (I*.) Silursuiten (12 Gypsabetissen seltener Trilobiten). 
Verh. d. k. k. Geol. Reichsanst, Wien Jhg., 1877, p. 74. 
Hoek (P. P. GC.) Neues Jahrb fiir Min. Geol. and Pal., 1912. 
Hoenes (R.) Die Trilobiten Gattung Phacops und Dalmanites. 
Jahrb. k. k. Geol. Reich., 1880, vol. 30, part 4, pp. 657-686. 
Ordovician: \ Dalmanites Angelini Barr., D. atavus Barr., D. Deshayesi Barr. D. 
Hawlei Barr., D. Morrisiana Barr., D. orba Barr., D. Phillipsi Barr., D. socialis Barr. 
and var. proaeva Emm., also var. grandis. 
Silurian: Dalmanites auriculata Dalm., D. cristata Corda, D. Fletcheri Barr., D. 
Hausmanni Brongn., D. McCoyi Barr. D. Reussi Barr. D. spinifera Barr. Phacops 
rugosa Corda, P. spinifera Barr., P. Glockeri Barr., P. Boecki Corda, P. breviceps Barr., 
P. Bronni Barr., P. bulliceps Barr., P. cephalotes Corda, P. emarginatus Barr., P. fecun- 
dus Barr., P. Hoeninghausi Barr. P. intermedius Barr., P. miser Barr. P. Signatus 
Corda, P. Sternburgi Corda, P. trapeziceps Barr., P. Volberthi Barr. 
The author discusses: 
1. Characteristic of the genera Phacops and Dalmanites; similar and dissimilar 
features. 
2. The group of Dalmanites socialis and their relationship to those of the Dalman- 
ites Hausmanni; also to the genus Phacops. 
3. The group of Phacops Glockeri as connecting link between Phacops and Dal- 
manites, 
4. The probable evolution between the genera Phacops and Dalmanites. 
