F. R. Cou'per Reed — Undescrihed Trilohites. 303 



IV. — WooDWARDiAN MusEUM NoTEs : Salter's Undesckibed 



Species. 



By F. R. CowPER Eeed, M.A., F.G.S, 



(PLATE XII.) 



IN the "Catalogue of the Cambrian and Sihirian Fossils in the 

 Woodwardian Museum," compiled by J. W. Salter, F.G.S. , and 

 published in 1873, many new specific names occur, in some cases 

 accompanied by a few words of description, but frequently by none 

 at all. Although several of these species have been described by 

 subsequent writers, there yet remains a large number which are only 

 known by their names, some of which have found their way iuto 

 geological literature. It therefore seemed desirable to rescue these 

 forms from their present unstable position, and to issue a detailed 

 account of their characters to avoid future confusion. The original 

 specimens are in the Woodwardian Museum, and though in many 

 instances they are in a poor state of preservation, rendering the 

 precise and minute diagnosis of the species difficult, yet the sub- 

 sequent acquisition of further specimens of the same forms has 

 enabled me to make the descriptions more complete. 



TEILOBITA. 



Olenus (s.g. Parabolinella) Planti, Salter. (PI. XII, Fig. 1.) 



1873. Olenus Plantii, Salter : Cat. Camb. Sil. Foss. Woodw. Mus., p. 11 [a 272). 

 1877. Olenus Plantii, H. "Woodward: Cat. Brit. Foss. Crust., p. 47. 

 1891. Olenus Planti, "Woods: Cat. Type Foss. "Woodw. Mus., p. 149. 



Salter described this species (loc. cit. supra) as follows : — "An oval 

 species, much flattened and expanded. Mr. J. Plant, who discovered 

 it, has distributed casts and photographs of this fine and well-marked 

 ■fossil." In addition to the almost complete specimen labelled a, 272, 

 from the Upper Lingula Flags of Moel Gron, Upper Mawddach, 

 there are two casts and a photograph of the same, and two casts and 

 a photograph also of an imperfect head-shield, showing the free 

 cheek attached, from the same beds at Craig y Dinas. These were 

 presented to the Woodwardian Museum by Mr. Plant. On the 

 specimen a, 272 the name " Conocorijphe Plantii'" is written in white 

 paint, but by whom or at what date is uncertain. From this 

 material the following diagnosis of the species is possible : — 



Diagnosis. — General shape oval. Head-shield almost semicircular 

 in outline, the curve being slightly flattened in front ; about twice 

 as broad as long. Genal angles spiued. Glabella subquadrate, 

 nearly as broad as long, slightly narrowing anteriorly ; about three- 

 fourths the total length of the head-shield ; gently convex and raised 

 above cheeks, from which it is sharply marked off by straight 

 regular axal furrows which converge a little towards the front end 

 round which they curve and meet, defining it from the flattened 

 pre-glabellar common portion of the fixed cheeks. Surface of 

 glabella marked with two distinct pairs of lateral furrows. The 

 furrows of the posterior pair run obliquely backwards with rather 

 an irregular wavy course at angles of about 45° to the axal furrows, 



