F. R. Coicper Heed — Triloh lies from Haverfonlicest. 387 



this may be due to their state of preservation. It is present in 

 ■Gh. amphora, Salter/ but in other respects this species is distinct. 



Encrinurus multiskgmentatus (Portlock). (PL XII, Fig. 5.) 



This species was not recorded by Messrs. Marr and Roberts from 

 the Haverfordwest area, but in the TurnbuU Collection there are 

 several well-preserved pygidia and one cranidium from the Slade 

 Beds of Cuckoo Grove Lane. 



The cranidium of this species, which was described by Portlock ^ 

 as Ampyx (?) baccatus, has a characteristic circlet of about ten large 

 projecting tubercles in front of the pear-shaped convex glabella, 

 which in our specimen (a cast) shows distinct traces of two pairs 

 of lateral lobes. The tumid fixed cheek is about half the length of 

 the glabella, and is ornamented, like it, with large tubercles. The 

 pygidium, upon the characters of which Portlock ^ based his species 

 Amphion [B.] midtisegmentatus, is of an elongated triangular shape, 

 with a long tapering axis annulated to its tip with 24-30 rings, 

 which arc quite continuous across the axis, though between the 

 posterior ones the intervening furrows are less deep in the middle. 

 No tubercles are present on the axis. The lateral lobes consist of 

 12 simple pleurge (8-10 only show in our specimens, which are 

 imperfect posteriorly) ; the anterior ones are curved gently back- 

 wards, while the posterior ones are successively more strongly 

 directed backwards till the last few lie almost parallel to the axis. 

 The whole surface of the pygidium is finely granulated, and there 

 are 1-3 large tubercles on each pleura. 



Dimensions. mm. 



Length of cranidium ■ ... 8' 5 



Length of pygidium .... H'O 



Width of pygidium (at front end) 12'5 



Remarks. — A form under the same specific name, comparable or 

 identical with Portlock's species, has been described bj'- Schmidt* 

 from the Lyckholm Beds of the Russian Baltic provinces, and by 

 Tornquist^ from the Leptasna Limestone. The species has also 

 recently been recognised in the Whitehouse and Drummuck groups 

 of the Girvan district. It is closely allied to JS. SeebacM, Schmidt," 

 from the Wesenberg Beds. 



The points of difference between E. multisegmentatus and the allied 

 -El mnltiplicatus have been previously given by the present author ^ 

 in describing the latter. The type of Portlock's ^. multisegmentatus 

 is in the Jermyn Street Museum, where I have had the privilege 

 of examining it. 



1 Salter: op. cit., p. 42, pi. iv, fig. 16. 



2 Portlock: Geol. Rep. Londonderry, p. 262, pi. iii, fig. 11. 



3 Ibid., p. 291, pi. iii, fig. 6. 



* Schmidt: Rev. Ostbalt. Silur. Trilob., pt. i (1881), p. 227, pi. xiv, figs. U, 15 ; 

 pi. XV, figs. 19, 20. 



^ Tornquist; Undersolm. Siljansom. Trilobitf. (Sver. Geol. Uudersokn., ser. C, 

 JSTo. 66), 1884, p. 24, pi. i, figs. 18, 19. 



6 Schmidt: op. cit., p. 229, pi. xiv, figs. 16-26 ; pi. xiv, figs. 21-23. 



7 Reed: Geol. Mag., Dec. IV, Vol. VIII (1901), p. 107, PI. VII, Fig. 3. 



