460 Mli. O. K. VINE ON THE POLYZOA OF 



species. In one colony some of the cells are long and pointed at 

 the proximal extremity, while others are thick at both extremities 

 of the cell. In one colony many of the cells are less robust, but 

 of a character similar to those in the other. On another fossil a 

 small delicate colony (onl)'^ a few cells) is preserved, which comes 

 very near to d'Orbigny's type species. The dimensions of the cells 

 (length and breadth in all these examples), in some parts of the 

 C!)lony at least, are similar to the dimensions given by d'Orbigny 

 {op. cit. p. 839). 



Habitat. On Ttrehraiida hiplicata and Torynonrinus mano7i, Seeley. 

 Fossils : No. 6, two colonies ; and No. 8, two colonies, much better 

 preserved. 



Horizon. Red Chalk, Hunstanton. 



7. Stomatopora linearis, d'Orb. 



1852. Stomatopora linearis, d'Orb. Terr. Cret. v. p. 838, pis. 629- 

 658. 



The species described and figured by d'Orbigny represents a free- 

 growing Polyzoou, with peculiarly irregular branches. The prin- 

 cipal branch is long and flexuous and contains eleven cells ; after- 

 wards the branching is thrown off at right angles rather freely, and 

 not dichotomonsly, as in other species of Stomatopora. 



I have met with only one nnbranched example of this species in 

 the Eed Chalk, and the differences between the Cenomanian form 

 (d'Orbigny) and this are slight indeed. The zooecia of the British 

 form are rather less oval than the Prench, and there are indications 

 that these were delicately jmnctate. 



Habitat. On Terehratala bipUcata. Fossil No. 7. 



Horizon. Red Chalk, Hunstanton. French example — Havre 

 {iVOrb.). 



Genus Proboscina, Audouin. 



1838. Criserpia, Edw. ; 1847. Ichnonea, d'Orb. ; 1852. Probo- 

 scina, d'Orb. Terr. Cret. v. p. 844. 



' The genus Prohoscina is a convenient, rather than a natural 

 division of the Stomatopora group. Partially accepted and defined 

 by d'Orbigny, the genus loses much of its individuality, for many 

 of his species have been variously located by other authors. Mr. 

 Hincks says (Ribliogr. 33, p. 432), "I do not venture to identify 

 Stomatopora eapansa with d'Orbigny's Proboscina ramosa (^=Id- 

 moiiea cenomana, d'Orb.), though it bears a strong general resem- 

 blance to it ; " while Tub alipora fimbria, Lamk. (p. 448)= T.flabel- 

 laris, Busk (Bibliogr. 31, p. 25), is identified, though doubtfully, by 

 both authors as Proboscina latifolia, d'Orb. Both Mr. Busk * and 

 Mr. Hincks disallow the genus for recent species ; the latter author 

 bracketing the Stomatoporw whose zoaria are partially erect and 

 free as the subgenus Proboscina, Smitt. Stomatopora incrassata, 

 Hincks, thus absorbs Tabulipora {Proboscina) incrassata, Sm., 

 Ahcto retiformis, Hincks, and 1 Filisparsa incrassata, d'Orb. From 

 * ' CljiiUenger* Eeport, pt. ii. 



