THE RED CHALK OE Hir:NSTANTON. 



465 



•ouly, using the illustrations and descriptions of other authors as 

 ke^'-notes to a proper interpretation of the species indicated. 



Habitat. On Terebratt.da biplicata, Fossil ^o. 3, and Lioce ramus. 



Horizon. Red Chalk, Hunstanton. 



4. Stomatopoea grantjlata (Edwards). Var.* A. 



1852. /Stomatojjora incrassata (?), d'Orb. Terr. Cret. v. p. 837, 

 pi. 62S. f. 9-11. 



Zoarium much more stunted, compressed, and broader than the 

 normal form ; branches short, generally from two to three cells 

 Cmore frequently the first) before each bifurcation ; the length of 

 the branch in this interval about 1 millim. Zooecia stunted, occupy- 

 ing the whole width of the branch, punctured in horizontal lines ; 

 length of each | millim. 



Habitat. On Terebratula biplicata. Fossil No. 4. 



Horizon, lied Chalk, Hunstanton. 



.5. Stomatopoea eamea (Blainville ; non d'Orb.). 



1834. Alecto ramea, Blainv. Man. d'Actinol. p. 4()4, pi. 78. f. 6. 



1850. Alecto ramea^ Lonsdale, Dixon's Geol. Sussex, p. 268, 

 pi. xviii. f. 35-40. 



Good examples of this species are rare in the Red Chalk, though 

 ■fairish examples are found in the Upper White Chalk. 



Zoarium uniserial, branches irregular and of nearlj^ uniform 

 breadth, but bordered in this case by a very narrow band, probably 

 ;a slight development of a basal lamina similar in some respects to 

 the basal lamina of Dlastoj^ora obelia, Johnst. t. Zo^jecia nearly uni- 

 .form in width throughout ; peristome inclined upwards ; aperture 

 .circular (normal), slightly oval when worn. 



Habitat. On Terebratula biplicata. Fossil No. 5. 



Horizon. Red Chalk, Hunstanton ; "White Chalk, Sussex. 



'6, Stomatopoea longiscata, d'Orb. 



1852. Stomatojjoixi longiscata, d'Orb. Terr. Cret. v. p. 839, pi. 629. 

 i. 9-11. 



There are several examples of Stomatojjora, adherent to Tere- 

 bratula biplicata especially, that I cannot place with either 



5. granidata or S. ramea on account of the peculiarities of the 

 zooecia. These may be placed, I think, under the above name. 

 Generally the cells are of one width throughout ; but there are 

 several fragments in which the proximal extremities are thinner 

 than the distal ; this, however, cannot be accepted as a rule. On 

 "Fossil No. 8" are apparently two colonies, ditfering slightly 

 from each other, yet I cannot separate them so as to make two 



* This variety is not common, for I have met with only two examples, the 

 finest of which I have taken as tiie type. Whenever I can, I prefer working 

 along the lines of Mr. Waters and Dr. Pergens, so as to reduce the nomen 

 .clature of species, rather than increase the difficulties of the paheontologist by 

 the introduction of new names unnecessarily. 



t Busk, Brit. Mus. Cat. pt. iii. p. 28, pi. xxvi. 



