E. D. Wellhnrn — A Neio Sj^ecies of Lepr acanthus. 451 



approaclies closely to Hall's figures of T. ensifonnis, but the thecse 

 are opposite, and not alternate, and are gently curved. One 

 specimen shows the proximal, or sicular end, to be more abruptly 

 rounded than the distal. 



Locality. — Sutherland's Creek, Darriwill, close to the spot marked 

 " W.L.S.l." on Wilkinson's map. 



DESCRIPTION OF PLATE XXII. 



Fig. 1. — Monograptus, sp., enlarged. 



,, 2. — Didymograptus gracilis, Tqt., enlarged. 



,, 3. — LeptograptuD antiquus, T. 8. Hall. 



,, 4. — The same, showing thecse enlarged. 



,, 5. — Tetragraptus projectus, n.sp. 



,, 6.— The same, showing thecse enlarged. 



,, 7. — Dichograptus octonarius, J. Hall ; thecae enlarged. 



,, 8. — Clonograptus rigidus, J. Hall, var. tenellus, Lns. 



,, 11. — Bryograptus Victoria, T. S. Hall. 



,, 12. — The same, enlarged. 

 (Unless otherwise stated, the figures are of the natural size.) 



III. — On a New Species of Lepracanthus from the Yorkshire 

 Coal-measures. 



By Edgar D. Wellburn, L.R.C.P. & &.E., F.E.I. P.H., F.G.S., etc. 



Genus Lepracanthus, Owen. 



Geol. Mag., Dec. I, Vol. VI (1869), p. 181. 



Lepracanthus rectus, sp. no v. 



THE spine is 40 mm. in length, by 5 mm. in width at the junction 

 of the inserted and exserted portions ; from this point the spine 

 gradually narrows to a moderately fine point at the apex. The 

 posterior margin is nearly straight, the anterior one gently curved, 

 the curve being more marked distally. The lateral surfaces meet in 

 front at a moderately acute angle, the spine being much laterally 

 compressed. The posterior surface is concave, and each margin is 

 armed with the usual well-marked recurved denticles. The sides of 

 the exserted portion are ornamented with a longitudinal series of 

 ganoine-coated, tuberculated ridges. The tubercles are squarely 

 shaped, and are arranged in a close series, even in the proximal 

 portion of the spine. In the distal two-thirds there are five such 

 ridges, but in the proximal third they are increased by intercalation 

 to seven. Their direction is as follows : — The anterior one forms 

 a prominent keel on the anterior border, the next two run to the tip 

 more or less parallel to that border, one runs close to and parallel 

 with the posterior border, another runs to the apex between these 

 two sets, and, lastly, on each side of this ridge are intercalated two 

 shorter ones. The inserted portion is well marked, and the line uf 

 demarcation between this and the exserted portion runs upwards and 

 backwards, cutting the anterior and posterior margins at an angle 

 of 45 degrees. 



The present spine, for which I propose the specific name rectus, 

 differs from L. Colei, Owen, in that it is straighter and more robust, 



