Pa 



;e 154, lines 15, 20, and 26 from bottom, for Glyphoceras read Glyplrioceras. 

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



155 

 156 

 156 

 159 



161 



id- 



les 



18 „ delete 10 (?). 



16 from top, add 6 — 7 costulae. 



20 from top, add page 149. 



10 ,, for species, From read species from. 



12 ,, add A fragment of a valve of D. funiculata, with a trace of its marginal 



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

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

 consisting mainly of compressed little Ostracods, such as the 

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

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



14 „ for 3 read 4. 



21 „ delete Nos. 39 a and 44 a. 



2 from bottom, after mesolateral insert (see fig. 3 b). 



7 from top, after 39 is add PL XXX, figs. 4«, b. 



8 ,, for 43 read 48. 



9 ,, after ventral add with some remains of the left valve. 



13 ,, after ridges read and from those of the ventral margin (tig. 4 b). 



3 ,, for 3 b read 3 c. 



10 from bottom, after and 9 add Museum of the Yorkshire College, Leeds, JN'os. 13 



and 40. 

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



25 ,. for parallel to each other read divergent from each other. 



165 „ 24 ,, read their relative position (though crushed, and obscure in the figure; 



and the ornamental lines on the ultimate segment indicate the dorsal 

 aspect. 

 , 173 ,, 22 ,, add In the three-spined 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 bayonet 

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

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

 or setae. 

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

 „ ,, XXII, line 7 from top, for Chsenocaris read Calyptocaris. 



