758 ME. r. E. C. EEED ON THE LOWEE PALAEOZOIC [NoV. 1 899, 



the rounded tip being very faintly elevated. There is no trace of 

 furrows on the pleural lobes. 



Measurements. 



mm. 



Length of pygidium 2r0 



Width of the same 36-0 



,, of axis at the front end 13"0 



Length of the same 15*0 



Asaphus platyrhachis, Steinhardt/ has a pygidium resembling 

 that of A. Haughtoni in its weak convexity, in the relative width 

 and the faintness of the axis, the marking of its posterior end, and 

 the concavity of the border. But it differs in being elongated and 

 not transverse in shape, and in possessing traces of ribs on the 

 pleural portions. 



Ill^nes Davisi, Salt. var. pseudolimbates nov. 



A somewhat abundant species of lllcenus occurring in Stage 2 of 

 the Tram ore Limestone Series, of which there are several rather 

 imperfect specimens in the Geological Survey Collection at Dublin, 

 shows a few features different from I. Davisi^' to which it has been 

 ascribed. The large eyes are nearer the posterior margin of the 

 head-shield than in 1. Davisi ; there is a small median tubercle 

 near the base of the glabella, as in /. limhatus, Linnarsson,^ and the 

 surface of the shell is finely punctate. 



There are ten body-rings as in /. Davisi, and the relative width 

 of the axis and pleurae and position of the fulcrum are as in that 

 species. Pygidium similar in shape to that of /, Davisi, but with 

 the lateral angles truncated. 



It is possible that this form really constitutes a distinct species. 



Teamoeia punctata, gen. et sp. nov. (PI. XLIX, figs. 14-16.) 



Portions of the head-shield of a peculiar trilobite occur with 

 some frequency in Stage 3 of the Tramore Limestone Series. In 

 the Geological Survey Collection at Dublin are the most perfect 

 specimens that I have seen. The characters are the following : — 



Head-shield semicircular, flattened, surrounded by a raised 

 flattened border of equal width, ornamented with thread-like lines 

 concentric to the margin. The inner side of the border slopes down 

 into the furrow which marks it off from the rest of the head-shield, 

 and in this furrow lies a single series of nearly equidistant pits 

 averaging about four to every 5 mm. The genal angles are produced 

 into flattened spines curving slightly inward and devoid of the 

 furrow and pits, but ornamented with the concentric lines of the 



^ Steinhardt, Beitr. z. Naturk. Preussens, No. 3 ' Die in preuss. Gesch, gef. 

 Trilob.' 1874, p. 24 & pi. i, fig. 10; Pompeckj, 'Die Trilobf. d. ost- u. west- 

 preuss. diluv. Gesch.' 1890, p. 82 & pi. v, fig. 7. 



2 Monogr. Palgeont. Soc. ' Brit. Trilob.' p. 194 & pi. xxix, figs. 10-16. 



3 ' Om Vestergotl. Cambr. o. Silur. Aflagr.' Kong. Svensk. Vet.-Akad. Handl, 

 vol. viii (1869) No. 2, p. 77 & pi. ii, fig. 43. 



