XV 



Page 154, lines 15, 20, and 26 from bottom, for Glyphoceras read Glyphloceras. 

 „ „ line 16 from bottom, for Ortonensis read Oretonensis. 

 „ 155 „ 18 „ delete 10 (?). 

 „ 156 ,, 16 from top, add 6 — 7 costulje. 

 ., 156 „ 20 from top, add page 149. 

 ,, 159 ,, 10 ,, for species, From read species from. 



" 12 ,, add A fragment of a valve of B. funieiilata, with a trace of its marginal 



cord, and a long rugose mesolateral ridge, is in the British Museum 

 fl. 280, No. 26). It is in a thin black, micaceous, calcareous shale, 

 consisting mainly of compressed little Ostracods, such as the 

 shales referred to at page 164, and like some of the "oil-sbales" of 

 Scotland. Prom Tyrone ; marked " Tyrone, Sheet 58, No. 5." 

 „ ,, „ 14 „ for 3 read 4. 



„ ,, „ 21 ,, rfe/e^e Nos. 39 A and 44 A. 



,, ,, 2 from bottom, (?/??»• mesolateral !)!sej-; (see fig. 3 i). 

 ,, 161 „ 7 from top, f(/i'e)-39i! «f/(/Pl. XXX, figs. 4«, i. 

 „ ,, •> S ,, for ^'i read -^b. 



:, „ ,, 9 ,, o/i'er ventral arfj with some remains of the left valve. 



„ ,. „ 13 „ o//«' ridges re(7(/ and from those of the ventral margin (fig. 4 i). 



,, 162 „ 3 ,, for 3 bread 3 c. 

 „ ,, „ 10 from bottom, after and 9 add Museum of the Yorkshire College, Leeds, Xos. 43 



and 40. 

 „ 163 „ 6 from top, after oblique insert to the dorsal ridge at an angle of 85°. 

 „ ,. >, 25 ,, /b>- parallel to each other r^rtf/ divergent from each other. 



„ read their relative position (though crushed, and obscure in the figure) 

 and the ornamental lines on the ultimate segment indicate the dorsal 

 aspect. 

 „ add In the three-spiued caudal appendage the dorsal aspect is shown ; for 

 the head of the style overlaps the heads of the stylets (more clearly 

 in the photograph than in the lithograph). The style is of a bayontit 

 shape with a median ridge. The stylets are sulcate, with four 

 costulae, and have obscure indications of the bases of marginal hairs 

 or setae. 

 In Explanation of Plate XXI, line 21 from top, for Scoiileri (?), M'Coy, read testudinea, Scouler. 

 „ ,, XXII, line 7 from top, for Chxnocaris read C'alyjjtocaris. 



165 



173 



24 



22 



