464 31 K. <J. K. VINE ON THE POLYZOA OF 



The forms are liot jiltogethor unlike the Hippothoa injlata, Hall, a 

 Silurian species referable, says Dr. H. A. Nicholson, to Stomatopm-a, 

 as this genus is usually understood*. In the Jurassic rocks there 

 are similar stunted forms ; but, as these have not been described as 

 yet, I cannot refer to them more minutely. The example that I 

 have selected for description is adherent to one of the smaller fossils ; 

 but some of the best examples are found on those that are larger. 

 Zoarium rarely bifurcating, branches linear or twisted, occasionally 

 anastomosing. Zocecia short and plump, with aperture considerably 

 less than the diameter of the cell ; length of zocecia generally about 

 I millim., and rather less in breadth. 



Habitat. Type, on Terehratula hiplicata. Fossil No. 2. 



Horizon. Eed Chalk, Hunstanton. 



This little Polyzoon is one of the most peculiar that I have met 

 with in the lied Chalk, and for a long time I was inclined to regard 

 it as belonging to some other group of fossil organisms. In the 

 type form I have been able to detect the small orifices in some of 

 the cells, and, in an example on one of the larger fossils, a more 

 perfect cell. 



3. SroMATOPoiiA (iKAjSi'LATA (Edwards). 



1838. Alecto (/ramdata, Edw. Sur les Cris, &e. pi. xvi. f. 3, 3«. 



1852. Stomatopora granulata, Bronn, 1848; d'Orb. Terr. Cret. 

 V. p. 836, pi. 028. f. 5-8. 



1875. Alecto (jramilata, Busk, Brit. Mus. Cat. pt. iii. pi. 32. f. 1. 



1880. Stomatopora granulata. Hincks, Brit. Marine Polyzoa. 



1889. >Storiiatop)ora granalata, Waters, Quart. Journ, Geol. Soc< 

 vol. xliii. p. 341. 



Zoarinrn variable in shape and in the general arrangement of its 

 anastomosing branches. Zocecia uniserial, nearlj^ uniform in breadth, 

 oral extremity occasionally erect and free ; surface of zocecia punc- 

 tured in the younger, granular in the older colonies. Gonoecium (?) 

 a cell rather more inflated beneath the aperture than ordinary zoopcia. 

 Diameter of branch from | to 1 millim. 



This species is not abundant in the Eed Chalk, but I have met 

 with some good fragmentary examples. It is almost useless to 

 compare the fossil with recent examples of the species, or even with 

 ]Sew-Zealand Tertiary species and variety f. Mr. Waters (Bibliogr* 

 24), however, includes in his synonymy of S. (jramdata a large 

 variety of forms that may be facially united. If I were to do 

 the same with the fossils before me, my labours would be less irk- 

 some, for it is indeed difficult to keep >S'. ramea and >S'. incrassata, 

 d'Orb., apart if \\e study the illustrations only. In dealing with 

 the fossils the case is different, and in all my^ descriptions it must 

 be understood that I describe and illustrate the Eed-Chalk fossils 



* Sec Aun. & Mag. Nat. Hist. ser. 4, vol. xv. Feb. 187o, pi. xi. f. 1-V> ; and 

 ' Manual of PalgBontology,' edit. 1890, vol. i. p. 637. 



t Mr. Wators's variety, before me while I write, lias been lent to me by 

 Miss E. C. Jelly. 



