R. M. Brydone — New Cretaceous Polyzoa. 495 



the anterior end ; the aperture is heel-shaped with a tiny denticle on 

 the posterior lip, hut it is often rendered more or less rectangular 

 by the intrusion of the edge of the ocecium at the anterior end ; 

 along the edges of the front walls there are more or less paired 

 openings of varying size, a long pair about the middle of the front 

 wall being fairly regular in occurrence. 



Ocecia large,, globose, and very flat; I have only seen them with 

 the shape of the aperture obscured or hidden by the margin of the 

 zooecial aperture. 



Avicularia. — Small accessory avicularia with arrowhead-shaped 

 apertures when well preserved occur very consistently in pairs beside 

 or just above the zooecial aperture and pointing towards it, while 

 irregularly placed examples also occur. 



This species occurs at the junction of the zones of A. quadratus 

 and B. mucronata in the Isle of Wight and in Hants, but is very 

 rare. It is obviously not a Memlraniporella in any ordinary sense, 

 but it appears at an horizon at which the Cribrilinidse were unusually 

 active in development, and it is so simple in structure and so closely 

 analogous to many Cribrilinidse, e.g. Memlraniporella tceniata, 1 that 

 I regard it as a highly aberrant Memlraniporella. 



CRIBRILINA REPLETA, UOm. nOV. (PI. XXXII, Fig. 9.) 



Syn. Cribrilina suffulta, Bryd., Geol. Mag., 1913, p. 437, PL XIV, Fig. 5 

 only. 



I have come to the conclusion that my so-called " coarse form " of 

 Cribrilina suffulta cannot, owing to its erect side walls almost fused 

 together, be properly united with Cribrilina suffulta, whose zocecia 

 are typically pyriporiform and quite separate. The relationship 

 between the two is, however, so very close that each is liable to 

 display here and there a considerable measure of the distinguishing 

 character of the other. I have figured an exceptionally well- 

 preserved specimen which shows that the tubercles on the anterior 

 lip are typically four in number, long and tapering, but very brittle. 

 C. repleta, like C. suffulta, is nearly related to Semiescharipora inter- 

 rupta, D'Orb., which is distinguished from them by an aperture 

 longer than its width. 



Cribrilina galanthis, nom. nov. 



Syn. Cribrilina Gregoryi, Bryd., Geol. Mag., 1913, p. 437, PI. XIV, Fig. 3 

 only. 



I have also come to the conclusion that my so-called "coarse form" 

 of Cribrilina Gregoryi should also be specifically distinguished. It 

 differs from C. Gregoryi in the tuberculation of the anterior lip of 

 the aperture, which is very indistinct, but I now think consists of 

 traces of four tubercles only as in C. repleta {supra). It also differs 

 in a strong tendency to squareness in the shape of the outer pair of 

 the perforations in the front wall. Specimens occur occasionally in 

 the lower part of the subzone of E. scutatus var. depressus which are 

 very near C. Gregoryi, but are not definitely that species, and may 

 perhaps be referred to this. 



1 Geol. Mag., 1917, p. 50, PL III, Figs. 3, 4. 



