Pohjzoa of the Adriatic. 267 



very slightly towards the point) ; mandible corresponding 

 exactly with the fixed portion, much curved inwards towards 

 the extremity. Ooecimn prominent, rounded, ridges radiating 

 from the centre towards the base, the furrows between them 

 punctured. 



This variety exhibits two striking peculiarities. 



The first and most important is the conformation of the 

 orifice, which Avill be best understood by comparing the cell 

 of this form with that of another (PI. X. fig. 3) which also 

 occurs in the Adriatic and is probably the common one on the 

 British coasts. The orifice of the latter is suborbicular above, 

 with a broad and open sinus (occupying about half the lower 

 margin or more), not constricted at the entrance, but widest 

 there, and narrowing slightly downwards, though still broad 

 and rounded at the bottom. 



The second peculiarity of the present variety lies in the 

 aviculariura, which is of great length and much attenuated 

 (PI. X. figs. 2 and 2 a) above the broad triangular base. The 

 slender mandible is mucli curved above. The area behind 

 the mandible is semicircular and entirely closed in by mem- 

 brane. The avicularium of the other form is short, suberect, 

 with a triangular mandible slightly bent at the tip. I'he 

 differences in the appendage are of less significance as it is 

 more liable to modification, and intermediate forms frequently 

 occur. But the variation in the orifice is certainly striking. 



The ansata variety gives us something of an intermediate 

 form ; but I have met with nothing that makes a near 

 approach to the present. 



Schizoporella lineoUfera^ n. sp. (PI. IX. fig. 10.) 



Zooecia disposed in radiating lines, small, ovate, depressed 

 below, slightly elevated above ; sutures well defined, a dis- 

 tinct raised boundary-line ; surface thickly and regularly 

 punctured, pores stellate ; orifice suborbicular, narrowed and 

 produced below, peristome not raised, immediately in front 

 of it an umbo bearing on the top a small pointed avicu- 

 larium, mandible directed straight outwards. Ocecium ample, 

 broad and rounded above, contracted towards the orifice ; sur- 

 face punctured, the opening closed by the operculum ; a 

 raised line round the base. 



At one time I was inclined to think that this might be the 

 Lepralia rudis of Manzoni, a Pliocene species (' Briozoi Plio- 

 cenici Ital.' 1869) ; but there is hardly ground for the iden- 

 tification. 



