VINE : POLYZOA AND MICROZOA OF YORKSHIRE AND NORFOLK. 371 
1825. Stomatopora, d'Orbigny, for uniserial species. 
Zoarium repent, adnate, or free at the extremities, uniserial, 
branching, and occasionally anastomosing. 
In working out the uniserial Storaatoporte of the Red Chalk, 
1 have, generally speaking, followed the leading of d'Orbigny, but 
it is not always safe to adopt his names for British examples without 
some qualification at least 
1. Stomatopora gracihs, M. Edw. (Alecto), Ann. Sc. Nat. (9) p. 207, 
pi. 46, f. 2. 
Var. delicatula (new. var.), pi. xvii., fig. 1. 
1890. S. gracihs, Edw. (var.). Vine, Quart. Jour. Geol. Soc, vol. xlvi., 
p. 463. 
Zoarium delicate, wholly adlierent. Branches dichotomizing 
irregularly, and variable in breadth and length. Zooecia uniserial, 
originating from a disc-like base from which two cells are generally 
thrown off, and these form the nucleus of two branches; slightly 
lateral in their points of juncture; aperture circular turning alter- 
nately to the left and right on the branch, and sometimes raised 
upwards . 
Habitat : The most typical examples on Terehratula hiplicata. 
Typical >S'. gracilis, vary very much both in the Neocomian and 
in the Upper Chalk, so much so that one hesitates to put the forms 
under one name. In the variety described above, the delicate 
character of the Hunstanton forms, which, by the way, are most 
abundant, and adherent also to a variety of fossils, appear to me 
to warrant their seperation from the more robust species. 
2. Stomatopora ramea, Blainville, pi. xvii., fig. 2-2a. 
1834. Alecto ramea, Blainv. Man. de Actinozoa, p. 464, pi. 78, fig, 6. 
1850. Alecto ramea, Lonsdale, Geol. of Sussex, p. 268, p. xviii., 
figs. 35-40. 
1890. Stomatopora ramea, Vine. Quart. Jour. Geol. Soc, vol. xlvi., 
p. 465. 
Examples of this species are rare in the Red Chalk. The 
Zoarium is, as Lonsdale says, uniserial, and the branching " irregu- 
larly divergent and nearly uniform in breadth, but bordered by a 
narrow band. Zooecia nearly uniform in width, peristome inclined 
upwards, aperture circular ; when worn slightly oval. 
