Yol. 65.] ROCKS OF THE TOTJRMAKEADX DISTRICT. 147 



it off. The name Gijbele connemarica is accordingly suggested 

 for this new species, which comes from the calcareous ashy grit of 

 Gortbunacullin (42), Shangort (322), and the Smithy bridge (5), 

 and is not uncommon at these places. 



Encrlnurtjs sp. 



Description. — Pygidium broadly sub-pentagonal, somewhat 

 arched down behind ; lateral lobes bent down steeply on each side. 

 Axis broadly conical, pointed, not reaching the posterior end of the 

 pygidium, tapering rather rapidly, annulated for. its whole length, 

 composed of thirteen complete rings, of which the first six are 

 strong and broad, but the posterior rings narrow and weak ; strong 

 articulating ring at the anterior end. Lateral lobes composed of 

 eight rounded simple ribs corresponding to the first eight axial 

 rings, sloping back obliquely, bent down and back at a weak 

 fulcrum situated at half their length. The ribs successively de- 

 crease in strength and length, the anterior five or six pairs being- 

 strong and reaching the margin with short free obtuse ends, but 

 the posterior two or three pairs being narrow and weak and curving 

 somewhat inwards so as to meet behind the tip of the axis, the 

 8th pair being very small and slender and closely pressed against 

 the side of the axis. Interpleural furrows narrow, well-marked. 

 Surface of axis coarsely granulated, with a single line of granules 

 arranged along the middle of the first five or six pleura) on the 

 lateral lobes. 



Remarks. — There is only one poor specimen of this type of 

 pygidium in the collection, and it was found in the gritty ash (322) 

 a third of a mile south-south-west of Shangort. It differs from 

 the well-known E.sexcostatus, Salter, 1 by its more numerous lateral 

 ribs and by fewer but complete axial rings. The Irish species 

 E. fcdlax, Eeed, 2 likewise has fewer lateral ribs and a different 

 ornamentation. E. mullisegmentatus (Portl.) 3 and E. multiplicatus, 

 Salter, 4 have, on the other hand, many more lateral ribs and axial 

 rings, many of which are incomplete. For the shape of the pygi- 

 dium, the course of the lateral ribs, and the tapering and anuulation 

 of the axis, E. varicostatus, Walcott, and E. vannulus, Clarke, from 

 the Trenton Limestone, may be compared ; but apparently this Irish 

 species is new. In the absence of all knowledge of the characters 

 of the head-shield, Dr. Vogdes's 7 classification of the European 

 and American species of the genus is not of much assistance. 



1 J. W. Salter, Mem. Geol. Surv. U. K. dec. vii (1853) no. 4, pi. iv, figs. 1-12. 



2 F. R. 0. Reed, Quart. Journ. Geol. Soc. vol. Iv (1899) p. 753 & pi. xlix, 

 figs. 9-12. 



a Id. ' Lower Palajoz. Trilobites of Girvan ' pt. iii (1906) p. 122 & pi. xvi, 

 figs. 9-11 a; see also Geol. Mag. dec. v, vol. i (1904) p. 387 & pi. xii, fig. 5. 



4 Id. Geol. Mag. dec. iv, vol. viii (1901) p. 107 & pi. vii, fig. 3. 



5 Safford & Vogdes, Proc. Acad. Nat. Sci. Philad. 1889, p. 167 & fig. 2. 



IJ J. M. Clarke, ' Geol. Minnesota : Palaiont,' vol. iii , pt. ii (1897) p. 740 & fig. 57. 

 7 A. W. Vogdes, Trans. San Diego Soc. Nat. Hist. vol. i, no. 2 (1907) pp. 61- 

 82 & pis. i— iii . 



t. 9, 



