CUSHMAN: PALEONTOLOGICAL TYPES. 
261 
Jackson, Proc. Boston soc. nat. hist., vol. 7, 1859, p. 54. 
Walcott, Bull. no. 10, U. S. geol. surv., 1884, p. 46. 
Grabau, Occasional papers Boston soc. nat. hist., vol. 4, 
1900, p. 681, pi. 36. 
1 Paradoxides harlani Green. Plesiotype. 
Middle Cambrian. Hayward Creek, Braintree, Massa¬ 
chusetts. 
Walcott, Bull. no. 10, U. S. geol. surv., 1884, p. 45, pi. 7, 
fig. 3. 
Grabau, Occasional papers Boston soc. nat. hist., vol. 4, 
1900, pp. 681, 693, pi. 35, fig. 3. 
2754 Paradoxides harlani Green. Plesiotypes. 
6265 Middle Cambrian. Hayward Creek, Braintree, Massa- 
Counter- chusetts. 
parts Walcott, Bull. no. 10, U. S. geol. surv., 1884, p. 45, pi. 9, 
fig. i. 
Grabau, Occasional papers Boston soc. nat. hist., vol. 4, 
1900, pp. 681, 692, pi. 39. 
4573 Paradoxides harlani Green. Plesiotypes. 
2753 Middle Cambrian. Hayward Creek, Braintree, Massa- 
2756 chusetts. 
12040 Grabau, Occasional papers Boston soc. nat. hist., vol. 4, 
1900, pp. 692, 693. 
6263 Selenisca gratiosa Meyer. Holotype. 
Oxford clay, Middle Oolite. Wiirmlingen near Tuttlin- 
gen, Wiirtemberg, Germany. 
Meyer, Palaeontographica, vol. 1, pt. 3, July, 1847, p. 141, 
pi. 19, fig. 1. 
11968 Strenuella strenua Billings. Plesiotype. 
Lower Cambrian. Nahant, Massachusetts. 
Grabau, Occasional papers Boston soc. nat. hist., vol. 4, 
1900, p. 672, pi. 34, fig. 8. 
12978 Strenuella strenua Billings. Plesiotype. 
Lower Cambrian. Mill Cove, Weymouth, Massachusetts. 
Shimer, Am. journ. sci., ser. 4, vol. 23, March, 1907, 
p. 199, fig. a-c. 
