PBOBOSCINA. 67 



Description of Figure. PI. II. Fig. 3. Zoarium encrusting 

 Nucleolites orlicularis (Phil.), X 12 dia. Cornbrash : Thrapston. 

 No. D. 1010. Vine Coll. 



Affinities. This species may be recognized by its extreme 

 irregularity, both in zooscial and zoarial characters. Haime's 

 figure shows two different types of zooecia one long, cylindrical, 

 and sinuous ; the other short and pyriform. The specimen from 

 Thrapston which I have referred to this species agrees with the 

 latter type. The zoarium in it is regularly biserial. Its formula 

 is p, c, I, r = I', 2, 2, 1-2. Haime's type is I', or 2, 2, 1-3. 

 Considering the irregularity of the latter, it seems unnecessary to 

 separate the species. The occurrence of the pyriform zooecia seems 

 sufficient to distinguish this from any other Jurassic species, 

 except P. morinica (Sauv.). As noticed in the remarks on that 

 species, the two ought probably to be included in the same species. 



Among Cretaceous species the nearest ally of this is P. inter- 

 media, Novak, 1 which has more regular and longer zocecia, while 

 many of these are almost uniform in diameter. 



Proboscina echinata (Miinst.) represents this group in the Caino- 

 zoic, but this has a loose open zoarium, the branches of which do 

 not anastomose, while the zooecia are shorter than in either of its 

 predecessors. 2 The formulae for the three forms are as follows : 



P. desoudini (Haime), Jurassic 1' 2 2 1-2 



P. intermedia, Novak, Cretaceous ... ... 1 1" 3 1-2 



P. echinata (Miinst.), Cainozoic ... ... 2 1 1 1-3 



SPECIMEN. 



D. 1010. Encrusting Nucleolites orbicularis (Phil.). Cornbrash. Thrapston. 

 Vine Coll. Figd. PI. II. Fig. 3. 



4. Proboscina cunningtoni, Gregory, 1895. 



SYNONYMY : 



Proboscina cunningtoni, Gregory, 1895, Eev. pt. ii. : Ann. Mag. Nat. Hist. 

 ser. 6, vol. xvi. p. 449. 



1 0. Novak. Beitr. zur bohm. Kreidef. : Denk. Jc. Akad. Wiss. Wien. 

 Bd. xxxvii. Abth. 2, 1877, p. 102, pi. v. figs. 1-13. 



2 Cellepora echinata, Miinst., in Goldfuss, Petref. Germ. p. 102, pi. xxxvi. 

 fig. 14. Diastopora echinata, Eeuss, Foss. Polyp. Wien. Tert. : Natunv. Abh. 

 Bd. ii. p. 52, pi. vii. figs. 14-15. 



