254 Dr. H. Woodward — Trilohites from Shantung, N. China. 



witli six clearly defined marginal serrations on each side. For this 

 form of pygidium Bergeron ^ adopts Meek's generic name Olenoides,^ 

 with which it certainly agrees most closely. I should venture to 

 suggest to Herr Monke that Stephanocare should be merged in 

 Olenoides (Meek, 1888) as the older and established name. 



The specimen here referred to Fig. 2 (locality uncertain, probably 

 from Shantung) measures 31mm. in breadth, by 19mm. in length; 

 the axis is 16 mm. broad at the proximal border, where it once joined 

 the cephalothorax, diminishing gradually to 6 mm. above, where it 

 terminates in a slender, rounded, mucronate point, which merges 

 distally into the dentated border. The pleuras or lateral lobes of the 

 tail are roundl^'^ elevated and elegantly curved, as shown in the two 

 views (a and b, Fig. 2). They are covered with minute rounded 

 pustules, A shallow groove divides each lobe or coalesced segment 

 of the tail by a smooth and well-marked furrow. The divisions of 

 the axis are rounded and raised, and separated by well-defined 

 grooves. 



Fig. 2. — Olenoides Sichthofeni? (Monke), sp. Upper Cambrian (?) : Shantuno-, 

 North China. 



It is interesting to notice how closely this form (Fig. 2) agrees 

 with the pygidium of Olenoides Marcoui, Whitfield, sp., from the 

 Lower Cambrian of North America (see Walcott, Fauna of Lower 

 Cambrian, pi. xciv, figs. 2a, 2b, pp. 642 and 575). It also agrees 

 closely with Bergeron's figures and those of Herr Monke's 

 (taf. 7, figs. 11, 12, and 13). Several other pygidia occur on 

 smaller slabs of yellow limestone, obtained by the Eev. S. Coulino- 

 at Kiao-chow, North China, though not from Yen-tsy-yai, but one 

 of the other fossil-yielding quarries in the Shantung province.-' 

 There are also some additional Cephalopods which it is hoped may 

 yield further information as to the age of these beds when Mr. G. C. 

 Crick is enabled again to take them up. 



It would be very agreeable to review in detail Herr Monke's 



1 "Etude de quelques Trilobites de Chine": Bull. Soc. Geol. France, ser. in 

 (1899), p. 499, t. 27. 



2 American Journal of Science, ser. iii (1888), vol. xxsvi, p. 165. 



3 They are probably identical with Bergeron's Olenoides Leblanci, op. cit., p. 506, 

 fig. 5, also seen on slab, pi. siii, fig. 5. 



