7 Arachn. 
SYSTJDlVtATlO. — T rILOBWA, BTC. 
2831 
ff. 2-5, Lake Monogr. British Canihrian 
Trilobites. — 0. {Leptoplastid.es, q. v.) 
salteri development, Raw London, Rep. 
Brit. Ass. 1907 p. 513. 
Orometopus elatifrons description, 
Raw T.c. p. 512. — 0. elatifrons p. 46 pi. 
iv ff. 6-10, praenuntius p. 48 f. 11, 
descriptions, Lake Monogr. British Cam- 
brian Trilobites. 
Oryctocara g . n. (Olenidae) geikiei sp. 
n. Idaho, Cambrian, Walcott Washing- 
ton, Smithsonian Inst., Misc. Collect. Q. 
53 p. 23. 
Paraholina spinulosa description, 
Lake Monogr. British Cambrian Trilo- 
bites p. 62 pi. vi ff. 8-11. 
Parabolinella wiUiamsoni description, 
Lake op. cit. p. 64 pi. vi f. 12. 
Phacops logani var. gaspensis described, 
Clarke Albany St. Educ. Dept. Mus. 
Mem. 9 p. 119 pi. x ff. 5-6, 10-16. 
Phillipsia strattoti-porteri sp. n. Mis- 
souri, Carboniferous, Rowley Missouri 
Bur. Geol. Mines 8 p. 94. 
Pterocephalus g. n. near Dicellocepha- 
lus, hemicycloura sp. n. Cambrian, 
Shropshire, Raw London, Rep. Brit. 
Ass. 1907 p. 512. 
Shumardia pusilla p. 40 pi. iii ff. 18- 
20, pi. iv ff. 1-4, with morvensis var. n. 
p. 43 pi. iv f. 5, Cambrian, Wales, Lake 
Monogr. British Cambrian Trilobites. 
Symphysurus microphtkalmiis sp. n. 
Cambrian, Shropshire, Raw London, Rep. 
Brit. Ass. 1907 p. 512. 
Thaleops ovata p. 247 pi. lx ff. 11- 
13, pi. Ixi ff. 6-7, arctura p. 248 pi. Ixi 
f. 8, characters, Raymond & Narraway 
Pittsburg, Ann. Carnegie Mus. 4 . 
Triarthrus shinetonensis sp. n. Cam- 
brian, Shropshire, Raw London, Rep. 
Brit. Ass. 1907 p. 512. 
Typhlo)iiscus princeps sp. n. Silurian, 
Haverfordwest district, Reed Geol. Mag. 
5 p. 433 pi. xiv ff. 1-3. 
Zacanthoides idahoensis sp. n. Idaho, 
Cambrian, Walcott Washington, Smith- 
sonian Inst., Misc. Collect. Q. 53 p. 26. 
XIPHOSURA. 
^Belinurus in Middle Coal Measures, 
Sparth, Rochdale, Parker Rochdale, 
Trans. Lit. Sci. Soc. 9 pp. 64-76. 
Limidus, mechanism of the embryonic 
heart rhythm, Carlson & Meetc Amer. J. 
Physiol. 21 pp. 1-10 ; fossil and recent 
species, Stromer von Reichenbacii Ber- 
lin Monatsber. D. geol. Ges. 1907 pp. 
187-189. — L. polyphemus early figure 
of. Calm AN Science 27 p. 669. 
