NO. 5 . CAMBRIAN TRILOBITES 361 



On account of not being able at present to obtain the type specimens 

 of this species, the original figures of Matthew are reproduced on 

 plate 53, figures i, la-c. 



Formation and locality. — Middle Cambrian : Hastings Cove, about 

 0.75 mile (1.2 km.) from Torryburn Station on the Intercolonial 

 Railroad, New Brunswick, Canada. Collection of Dr. George F. 

 Matthew. 



DOLICHOMETOPUS(?) ALCESTE Walcott 



Plate 54, figs. 3, 2a-b 



Dolichometopus alceste Walcott, 1905, Proc. U. S. Nat. Mus., Vol. 29, p. 94. 



(Species described as below.) 

 Dolichometopus alceste Walcott, 1913, Research in China, Vol. 3, p. 215, 



pi. 22, figs. 3, Z(i-b. (Described and illustrated.) 



This species occurs at the same locality as D. (f) deois, but not in 

 the same bed of limestone. It differs from D. {?) deois in having a 

 much more convex glabella with nearly parallel sides. Glabella 

 marked by a posterior pair of furrows, extending inward and back- 

 ward so as nearly to cut ofif a small, subtriangular lobe at the base of 

 the glabella ; also three pairs of short, faintly impressed furrows that 

 extend in at right angles to the side of the glabella ; occipital furrow 

 and ring unknowai ; dorsal furrow shallow but well defined. 



Fixed cheeks very narrow ; they slope down into the strong furrow 

 just within the narrow palpebral lobe and anteriorly slope down to 

 the frontal limb ; the rim of the palpebral lobe crosses the narrow 

 fixed cheek, forming a very short palpebral ridge ; frontal limb short, 

 nearly flat. 



The exterior surface, under a strong lens, shows a few fine, scat- 

 tered punctules. The inner surface of the frontal limb, where 

 exposed by a breaking away of a portion of the shell, is strongly 

 punctate. 



The only specimen of the glabella of this species has a length of 

 12 mm., with a width at the palpebral ridges of 8 mm. ; the frontal 

 limb has a length of 1.5 mm. 



Formation and locality. — Middle Cambrian: (C4) In limestone 

 nodules at the base of the lower shale member of the Kiu-lung group,' 

 3 miles (4.8 km.) southwest of Yen-chuang, Sin-t'ai district. Shan- 

 tung, China. 



' Blackwelder, Research in China, Pub. No. 54, Carnegie Institution of Wash- 

 ington, Vol. I, Pt. I, 1907, Chap. 2, Stratigraphy of Shan-tung, pp. 37 and 40 

 (second list of fossils), and fig. 10 (bed 4), p. Z^. 



