Br. H. Woodivard — Trilobites from Shantung, iV. China. 253^ 



contains abundant representatives of parts of all the species of 

 Trilobites enumerated above, except Stephanocare sinense of Bergeron. 

 It measures 245 X 205 mm. 



The slab obtained by the Rev. S. Couling also measures 250 X 

 205 mm., but the portion photographed and figured only represents 

 about 180 X 112 mm. In order to add to the value of the slab 

 an additional tail of Drepanura Premesnili, Bergeron (Fig. 1), has 

 been very carefully inserted by the Chinese lapidary into the slab 

 (see Plate XIII, 3*''), though its identity as a species which occurs in 

 this bed from Yen-tsy-yai is vouched for by other pygidia of the 

 same species forming a part of the original slab. 



In the form named Brepanura Ketteleri, H. Monke (which like 

 Drepanura Premesnili, Bergeron, is founded upon detached pygidia 

 and separate and imperfect head-shields, also with elongated cheek- 

 spines), the lateral caudal spines are very much more elongated, and 

 remind one of the very long lateral cheek and caudal spines of 

 Bathynotus holopyga, Hall, from the Lower Cambrian (or Olenellus 

 zone of Walcott), Western Vermont, North America. [Fauna of the 

 Lower Cambrian, C. D. Walcott, pi. xcv, figs. 1, la, p. 646.] 



Fig. 1. — Vygiilinm oi JD)-epanura Premes)iili, Bergeron. Nat. size. N. Cambriau: 

 Yeu-tsy-yai, Province of Sliantuug, North China. 



Stephanocare Richthofeni, of which detached parts are seen upon 

 our slab, PI. XIII, Figs. 1 and 2, is represented on Herr Monke's 

 plate by six glabellee, two detached free-cheeks, and three pygidia. 

 There is an element of uncertainty about the correlation of some of 

 these, the underside of the pygidium (figs. 12 and 13) not agreeing 

 very well with the upper side (fig. 11, taf. 7), nor the glabellee 

 (figs. 1, 2, and 3) with tigs. 4, 5, and 6 of the same plate (taf. 7). 



I figure, p. 254 (Fig. 2), a detached pygidium preserved on a piece 

 of yellow, compact, fine-grained limestone, which has been polished 

 probably carefully and constantly by hand until it resembles a piece 

 of polished ' soapstone.' It is near to Herr Monke's fig. 11, taf. 7^ 

 but either his specimen is unsymmetrical (a very rare occurrence in 

 a Trilobite), or else the artist has drawn the pygidium with six 

 marginal dentations on the left side of the figure and seven on the 

 right, or he intended to indicate that it had one central spine and six 

 marginal spines on each side. In fig. 12, depicting the underside, the 

 artist represents it with six dentations on each side and no central 

 spine. The number of coalesced segments in Herr Monke's fig. 11 

 is four; in Mr. Couling's specimen, drawn p. 254 (Fig. 2), there 

 are six coalesced segments visible and a small mucro in the centra 



