472 MR. G. R. VINE 0^^ THE POLYZOA OF 



J/onzoii. Ilcd Chalk, Hunstanton ; and Cambridge Grecnsand. 



I have only one example of this very interesting species, and this 

 ))eing slightly abraded, has the apertures of several of the cells 

 broken ; but sufficient perfect cells remain to enable me to give the 

 diagnosis as above. 



1 have already (1885, Bibliogr. 19) described from the Cambridge 

 Greensand a peculiarly flattened Eiitalojjhora with large cells, which 

 1 named E. rjiganto^jora. Later still (1889, liibliograph. 21), I 

 referred an example, similar in many respects to the present one, 

 to the Prohoscina c/ic/antopora group. I have no evidence that the 

 Ked-Chalk form ever assumed a bi-diastoporan or Entalophorian 

 stage, consequently I cannot write so fully of this habit in the 

 present as in the (jrecnsand form ; but, as this species ought to find 

 a resting-place in the Prohoscina group, I prefer to give it the same 

 specific name as the Entalophora already referred to, and to figure 

 it as perfectly as possible. 



18. Proboscina bohemica (■?), Noviik. Variety. (Plate XIX. figs. 



9 a-9 d.) 



1877. P. bohemica, Xovak, Pryoz. bohm. Kreidef. p. 101, pi. v. 

 figs. 24, 25. 



1852? Idmonea radiolitiorum, d'Orb. Terr. Cret. v. pi. 633. 

 figs. 8-10. 



This beautiful little Polyzoon more closely resembles P. bohemica 

 of Novak than P. radiolitiorum, d'Orb., which probably is an ally 

 of Xoviik's species; but ours differs from both in the general habit 

 of the zoarium, but less so in the arrangement and disposition of the 

 zocecia. 



In the British form the branching is very irregular, but is unlike 

 the JcZwoJim-character shown in the figure of d'Orbigny's species. 

 In the early stage of the form the branch is thin, and from this 

 nucleus two, or even more, diverging, rounded branches are deve- 

 loped. The general character of the zoarial habit is unlike any 

 other species described from these strata. The zocecia, though tubular, 

 are rarely wholly exposed, and only the apertures with rather thick 

 ])eristomes are seen. From an abraded fragment (figs. 9 a, 9 h) it 

 seems that the tubular zocecia are short ; but this feature is what 

 one would naturally expect from a delicate Proboscina like this. 



Habitat. On Terebratuhi bijilicata. Fossil Xo. 21. 



Horizon. Ped Chalk, Hunstanton. 



19. Proboscina Toucasiaxa (?), d'Orb. 



1847. Idmonea Toucasiana, d'Orb. Prodr. ii. p. 2G5. 



1847. Idmonea elec/ans, d'Orb. Prodr. ii. p. 265. 



1852. Proboscina Toucasiana, d'Orb. Terr. Cret. v. p. 85G, pi. 

 (534. figs. 1-0. 



[1890. Stomatopora Toucasiana, Pergens, Pevis. Pryoz. Cret. 

 p. :VM, pi. xi. fig. 8.] 



The species described by d'Orbigny under the names cited above 



