Vol. 67.] THE AYOXIAN OP BITRRINGTOX COMBK. 373 



Zaphrextis omaliusi Ed. & H., Carruthers. 



Identical with ' Carruthers I ' pi. iv, figs. 1-4. 



At Burrington this species is abundant in Z ,, not uncommon in 

 Z, and at y, but has not been found above y. 



In the South- Western Province generally, Z. omaliusi enters as a 

 very small and very rare form in /3 ; in Z t it is not uncommon ; it 

 abounds in Z, and y, and ranges on into C^ 



Neither here nor elsewhere do I know of the occurrence of the 

 typical species in rocks of Visean age. 



Zaphrextis dexsa Carruthers. (PI. XXX, fig. 2.) 

 • Carruthers I ' pi. iv, figs. 7 & 8. 



At Burrington, Z. densa is rare in Z 2 , equally common with 

 Z. omaliusi at y, and common, after the disappearance of that 

 species, in C 1 above y. 



Our figure compares well with Carruthers's fig. 7, and is a 

 horizontal section of a typical specimen from O x , just below the 

 dolomite. 



The passage of Z. omaliusi into Z. densa, suggested by Car- 

 ruthers, is an established fact at. Burrington and in the South- 

 western Province generally. 



Zaphrextis koxixcki Ed. & H., Carruthers. 

 ' Carruthers II ' pi. v, figs. 1-4 a. 



At Burrington this species, in a narrow, cylindro-cornute form, 

 abounds in Z, and is common at y, but has not been found at any 

 higher level. A specimen from the base of Z 2 has shorter minor 

 septa. 



Xo example of the C., mutation, convergent with Cyathophyllum <p, 

 has yet been discovered at Burrington, although common at many 

 points of the South-Western Province, at Arnside, etc. 



Caninia. 



The following species of Caninia are represented at Burrington, 

 at the levels stated : — 



Caninia cornucopia Mich., Carruthers — Z 2 and y. 



C. pa tula Mich., Salee — y. 



C. cylindrica (Scouler) Salee— Cj. 



Caxixia corxucopi^e Mich., Carruthers. 

 Kefer to ' Carruthers III.' 



Mr. Carruthers has given so excellent an account of this species 

 that my notes need be but brief. 



At Burrington the species enters in Z 2 , is abundant at y with 

 C. patula, but disappears before the incoming of 0. cylindrica. 



In Z 2 , only the Zaphrentis stage is exhibited ; at y, the amplexoid, 

 or ' comu-bovis ' stage is not infrequently observed. At no point of 



