696 SILURIAN TRILOBITES, 



dealing witli Acidaspids from Bowning. In the first he described 

 species ascribed by him to the following well-known Trilobites*: — 



A. Verneidli, Barr., or A. i^esiculosa, Barr. 



AciJasjns near A. Prevosti, Barr. 



Acidaspis near A. mira, Barr. 

 In the second paperf the following : — 



Acidasjns near A. Dormitzer'i, Corda. 



Acidaspis near A. Leonhardi, Barr. 



At a later period one of us| described a new species, also from 

 Bowning, as A. lonyispiyiis. The whole of these will be passed 

 in review in the present paper. 



We now recognise the following four sj)ecies : — 

 Odo7itopleura hoivningensis, nobis. 

 ,, Rattei, nobis. 



,5 parvlssi7na, nobis. 



„ Jenkinsi, nobis. 



Odontopleura bowningensis, sp.nov. 



(PI. L., figs. 1-3; PI. Lii., fig. 5.) 



Sp. Char. — Bodji — Ovoid. Cephalic shield or cephalon — Subellip- 

 tical, about three times as wide as long measured between the 

 base of the genal spines, very tumid, rising abruptly from the 

 posterior margin, which is unusually straight, ornamented with 

 fine and moderately coarse granules. Glabella quadrate, central 

 lobe small, oblong, very intensely arched transversely, moderately; 

 so fore and aft, and almost sloping into the front margin, granu- 

 lated very distinctly, front lateral expansions distinct; lateral 

 lobes small, granulated and tumid, median pair about half the 

 size of the posterior pair and sem.iglobular, posterior pair suboval, 

 each pair very distinctly separated from each other by the basal 



* Proc. Lum. Soc. N.S. Wales, 1S8G, i. (2), Pt. 1, pp. 10(56-69. 



t Lor. i-lf. 1887, ii. (2), pp. 96-102. 



X Mitchell, lor. ri/., 18SS, iii. (2), p. 398; 1887, ii. (2), 1. 16, f. 7-10, 12. 



