W. D. Lang — On Stomntopora antiqua. 



263 



II. Stoiiatopoba antiqua, Haime, mutation capricornensis. 

 (PI. XIV, Figs. 1 and 3.) 



Fragmentary zoaria of a form hardly distinguishable from the 

 Sinemurian species Stomatopora antiqua, Haime, occur rather 

 commonly encrusting specimens of the coral Montlivaltia Victorice, 

 Duncan, from the Middle Lias, zone of Ziparoceras capricornus ^ 

 at Cherrington, Warwickshire, north-east of Moreton-in-the-Marsh, 

 Gloucestershire. The only apparent difference between this and the 

 Sinemurian form is in that the branching in the former is far more 

 regular, approaching in this respect the Oolitic species. This point 

 is shown in Diagram I, p. 267, where Fig. 3 represents S. antiqua, 

 Haime, and Fig. 4 its mutation in the capricornus zone. This being 

 the only difference which the fragmentary and ill-preserved material 

 presents, it looks as though this form was a direct modification of 

 S. antiqua, Haime, in time ; and since no other form has been found 

 at this horizon resembling more closely the Sinemurian species, 

 it may be looked upon as the modification of S. antiqua, Haime, 

 in the higher zone. But because this form is not identical with 

 S. antiqua, Haime, it is convenient to have a name whereby to 

 distinguish this mutation, as it is called, and I therefore propose 

 to name it S. antiqua, Haime, mutation capricornensis, indicating in 

 the name the horizon at which the mutation is found. 



A table of observations on these fragments is given below. 



TABLE OF OBSERVATIONS ON INDIVIDUALS OF STOMATOPORA 

 ANTIQUA, HAIME, Mut. CAPRICORNENSIS. 



1 H. B. Woodward: loc. cit., p. 157. 



