484 MR. G. K. VINE ON THE POLYZOA OF 



§ II. Suborder CHEILOSTOMATA, Busk. 



Celloporina, Ehreiibcrg. 



Genus Membranipora, Blairiv. See Hincks's Brit. Mar. Polyz. 



Eschara (pars), Pallas ; Flusfra (pars), Linne, Lamarck, Flem- 

 ing, Lamouroux, Audouin ; Membrmiipora, Blaiiiville, Johnston, 

 Busk, Smitt, Ilincks ; Cellepora (pars), Marginaria, Bermato^wm, 

 V. Hagenow ; Cellepora, d'Orb. f 



" Generic CJmracters. — Zoarium encrusting. Zocecia quinenncial, 

 or irregularly disposed, occasionally in linear series ; margins raised ; 

 front depressed, wholly or in part membranaceous " (p. 128, o^>. 

 cit.). 



The few species that I place in this group are very characteristic, 

 and likewise very rare in the Bed Chalk. 



39. Membranipora gaultina, sp. nov. (Plate XIX. figs. 13 a~ 

 13 d.) 



Zoarium very simple and uniserial. Zocecia elongate, sub-ovate, 

 produced or attenuated below; area oval, occupying nearly the 

 whole front, area- walls smooth (?), occasionally crenulated ; the 

 produced portion of the wall just below the area folded or puckered. 

 Zocecia linked together in linear series ; branches lateral, sometimes 

 from every cell, at other times three cells apart, and occasionally 

 from both sides of the same cell ; three of the longest zooecia 

 together measure one quarter of an inch. 



Habitat. On Inoceramus, Terehratula hipjlicata, Terehratula ca- 

 pillata. Fossils Nos. 38 and 39*. 



Horizon. Gault, Cambridge ; and Red Chalk, Hunstanton. 



This very peculiar Memhranipora I have been obliged to describe 

 as new, but not until after an examination of the illustrations of 

 all apparently similar forms known to me; even then I should 

 have hesitated to do so, had not a fine series from the Gault of 

 Cambridge been sent to me for examination by Mr. Jesson. 



At first I thought that the species described above may be placed 

 as an ally of either Hippotlioa elerjaiis or //. laxata, d'Orbigny 

 (Terr. Cret. pi. 711. figs. 1-4 and 12-15); but a reference to the 

 figures is sufficient to show that no identity can be established 

 between these forms. Novak (Bibliogr. 34) described two species 

 of Hippotlioa, H. desiderata and //. labiata, both of which, certainly 

 in some of their characters, closely resemble M. gaultina ; but 

 among at least one hundred zooecia examined, not a single attenu- 

 ation of the cell-wall exhibits the wavy outline indicated in jSTov.ilv's 

 figures. Then, again, the Membra }dp)ora-like area shown by Novak 

 is an accidental breakage of the once co%-ered portion, judging 

 from some of the perfect cells depicted, whereas in the present 



f In reproducing these names, Mr. Ilincks says in a note (p. 128), " I have 

 not thought it necessury to swell tliis list of synonyms by referring to all d'Or- 

 bigny's genera which include species of Meinhravi]>ora as now defined. Tlie 

 groups to which they belong are given in the Family synonymy " (p. 120, 

 op. cit.). 



