5 Arachn. 
Systematic — Trilobita. 
2331 
Richter, R. Von Bau und heben der 
Trilobiten ii. Der Aufenthal auf dem 
Boden. Der Schutz. Dio Ernahrung. 
Frankfurt-a-M. Sonkonborgiana 2 1920 
(23-43) texu-figs. 21 
Richter, R. and E. Paliiontologischo 
Beobachtungen im Rheinischen Devon. 
I. Uber einzelne Arten von Acidaspis, 
Lichas, Cheirurus , Aristozoe , Proso - 
coelus , Tcrebratula und Spirophylon 
aus dor Eifol. Wiesbaden Jahrb. Ver. 
Natk. 70 1913 (143-101) pi. i text-figs. 
22 
Ruedeman, R. A recurrent Pittsford 
( Salina ) fauna. Albany N.Y. St. Educ. 
Dept. Mus. Bui. 219 220 1920 (203-215) 
3 pis. 23 
II.— SUBJECT INDEX. . 
N. B. — The number in Clarendon , when 
not referring to a Volume, refers 
to the list of Titles. 
GENERAL = 2803-2823. 
Bibliography, Trilobita ; Raymond, 
18. 
Glabella, Lichadidae (Trilob.) ; 
Foerste, 8. 
Morphology of Pygidium, Trilobita ; 
Raymond, 17. 
Appendages, Eyes, Internal Mor- 
phology, Musculature, Trilobita ; Ray- 
mond, 18. 
Position, rest, locomotion, feeding 
habits, Trilobita ; Raymond, 18 ; 
Richter, 21. 
Habitats, Eurypterida ; O’Connell, 
14. 
Larval forms, Protaspis of Trilobita ; 
Raymond, 17. 
Phylogeny ; Trilobites, relations to 
Crustacea and Arachnida ; Raymond, 
15, 18 ; Evolution of Cheiruninae ; 
Barton, 1 ; Relationships of Spaero- 
coryphe ; King, 11. 
DISTRIBUTION = 2827. 
Palaeozoic. 
Cheirurinae , Barton, 1 ; Trilobila ; 
Raymond, 18. 
Pre-Cambrian. 
Eurypterida , O’Connell, 14. 
Cambrian. ^ 
Maryland, Trilobita ; Bassler, 2. 
Eurypterida, O’Connell, 14. 
Ordovician. 
Eurypterida, O’Connell, 14. 
America, Lichadidae (Trilob.) ; 
Foerste, 8 ; N. America, Trilobita ; 
Raymond, 16 ; Maryland, Trilobila ; 
Ba3sler, 2 
N.S. Wales, Trilobita ; Mitchell, 13. 
Silurian. 
Eurypterida, O’Connell, 14. 
New York, Eurypterida ; Ruedeman, 
23 ; Bunaia (Xiphosura) ; Clarke, 4. 
France, Trilobita ; Ferroni£re, 7. 
N.S. Wales, Trilobita ; Mitchell, 13. 
Devonian. 
' Eurypterida, O’Connell, 14. 
Rhine provinces, Trilobita ; Richter, 
22; Pterygolus (Eurypt.) ; Jaekel, 10. 
Dinant, Trilobita ; Mailleux, 12. 
, • Torquay, Trilobita ; Reed, 19, 20. 
\ Sherburne, N.Y., Trilobita ; Orabau, 
9 ; Western Tennessee, Dalmaniles 
teilob.) ; Dunbar, 6. 
\ ' 
Carboniferous. 
Eurypterida, O’Connell, 14. 
N.S. Wales, Trilobita ; Benson, 
Dun & Browne, 3. 
III.— SYSTEMATIC INDEX = 2831. 
N.B. — The number in Clarendon type , 
when not that of a Volume, refers to 
the list of Titles. 
fTRILOBlTA. 
Davies 5. — Mailleux 12. — Rich- 
ter 21. — Phillipsia, Benson, Dun 
& Browne 8 ; General discussion of 
relations, anatomy and habits, Ray- 
mond Conn. Mem Acad. Arts Sci. 7. 
