STOMATOPOKA. 
9 
to difference in dimensions ; but according to bis own measurements 
in his S. gy'acilifonnis the zooecia are occasionally 1 mm. in length, 
while in his S. linearis, var. mortoni, they are about TSmm. in 
length ; and if * *S. graciliformis were to be assigned to S. gracilis, 
then it ought to have longer instead of shorter zooecia than 
S. linearis. 
D’Orbigny separated from S. granulata, under the name of 
S. reticulata, the somewhat densely crowded form referred to this 
species by Michelin. But I quite agree with Pergens that 
Michelin was correct in his identification. 
The brief description given by Hamm of his Stomatopora 
amphorceformis is insufiicient for its certain recognition. But his 
description, so far as it goes, is consistent with the form belonging 
to S. granulata ; zooecia which may be described as amphoriform 
are shown on PI. I. Fig. 2. 
Affinities. 
The nearest ally of S. granulata is S. dichotoma (Lamx.) from 
the Bathonian, in which the zooecia are more regularly cylindrical, 
the zoarium more regular, and the peristomes usually less raised. 
Its distinctions from the living S. trahens (Couch) have been 
already stated (p. 7). Amongst Lower Cainozoic Stomatopor(B it 
is most allied to the Eocene specimens from New Zealand which 
AVaters assigns to this species ; the dimensions, however, as given 
by Waters and quoted on p. 5, suggest considerable differences ; 
the zooecia being six times as long as broad, whereas in the 
Cretaceous S. granulata that ratio varies from 3 : 6 to 3 : 8. 
The Stomatopora minima, Edm.,^ from the Upper Oligocene of 
Sdllingen, North Germany, is a very close ally of S. granulata', 
but the specimen figured by Edmer is insufficient to warrant the 
inclusion of that Bryozoan in the Cretaceous ‘ species.’ S. reussi, 
Greg.,^ from the Hungarian Miocene, is a member of the S. granulata 
series, with longer and thinner zooecia. 
1 F. A. Homer. Polyp. Nordd. Tert. Geb. : Paleeontogr. vol. ix. (18G2-4), 
p. 220, pi. xxxviii. fig. 1. 
* Cat. Jur. Ery. p. 55. 
