STOMATOPORA. 
7 
its resemblance to tbe Jurassic species S. dichofoma (Lamx.), of 
which it is unquestionably the Cretaceous representative. In 1847 
a great alteration in the interpretation of this species was made by 
Johnston/ who placed in it a series of recent Bryozoa. Nearly all 
subsequent writers upon this ‘ species ’ have removed from it 
some of the specimens Johnston referred co it, which are really 
Frohosctna ; but it has been usual to leave some of the recent 
uniserial forms in the Cretaceous species. The figures given by 
Hincks^ and Busk^ may be taken to represent the recent types 
referred to S. grayiulata ; they differ more from that ‘ species ’ 
than it does from 8. dicliotoma. The recent forms have the zooecia 
shorter in proportion to their width ; they are more punctate and 
less wrinkled. If the existing Cretaceous ‘ species ’ are to be 
united, then both must be included in S. dichotoma. Hence, as 
I have previously suggested,^ it is convenient to separate the recent 
members of this group under the name of S. trahens (Couch). 
M. Pergens, in his “ Revision des Bryozoaires du Cretace figures 
par d’Orbigny,” ® includes in S. granulata a series of forms 
described by d’Orbigny as distinct species. With most of his 
decisions, I fully agree. Pergens figured a specimen which showed 
that the transverse crumpling of the front wall of the zooecia was 
a very inconstant character ; and thus d’Orbigny’ s Alecto subgracilis 
may be abandoned. Pergens also places S. 'plicaia in the list of 
synonyms; as he has examined d’Orbigny’ s type, it is evident that 
the oval appearance of the zooecia in the original figure was 
exaggerated, or else it would have approached more nearly to 
S. calypso. With the abandonment of S. plicata, 8. linearis seems 
to me necessarily to fall into S. granulata ; for 8. linearis is only 
a variety with zooecia shaped like those of 8. plicata, and occurring 
^ Johnston: Brit, Zooph., 2nd ed. (1847), p, 280. 
» Hincks : Brit. Mar. Polyz. p. 425, pi. Ivii. figs. 1, 2. 
® Busk : Brit. Mus. Cat. vol. iii. p. 24, pi. xxxii. fig. 1. 
* Cat. Jur. Bry. p. 487. 
5 BuU. Soc. beige Geol. vol. iii. (1889), 1890, pp. 305-400, pis. xi.-xiii. This 
important work is hereafter referred to as “ Revision.” D’Orbigny’s monograph, 
referred to as “Bry. Cret.,” is vol. v. of “ Paleontologie fran 9 aise : Terrains 
Cretaces ” ; it is dated on the title-page as issued 1850-52, hut was apparently 
issued between 1851 and 1854. The dates of the parts and pages, as far as I have 
been able to verify them, will be given in the Bibliography. 
