302 Rev. T. Hincks on the 



disci of the species of Meyenia [Ephydatia]^ and in the same 

 way that between the coating-spicules of the species of Spon- 

 gilla. In both cases this tissue, consisting of air-chambers, 

 acts as a hydrostatic apparatus, which has attained its most 

 powerful development in the two European species — Sj). 

 fragilis and Trochospongilla erinaceus.'" 



XXXIX. — The Polyzoa of the Adriatic: a Supplement to 

 Prof. Heller^ s ''Die Bryozoen des adriatischen Meeres^ 1867. 

 By' the Eev. Thomas Hincks, B.A., F.R.S. 



[Concluded from vol. xvii. p. 271.] 

 [Plate IX.] 



SCHIZOPORELLA, Hincks {continued^. 



Schizoporella vulgaris^ Moll. 



f Lepralia Botterii, Heller, B170Z. d. adriat. Meeres, p. 30, pi. ii. fig. 4. 

 P Lepralia Stossici, ibid. p. 31, pi. ii. fig. 7. 



I do not venture to refer Heller's two species noted above 

 with certainty to the well-known S. vulgaris of Moll in the 

 face of the figures which he has given of them ; but his 

 descriptions apply for the most part to the latter form, and I 

 think it more than probable that we have only to do with a 

 single species. The neck-like prolongation of the upper part 

 of the zooecium wliich is shown in the figure of L. Botterii is 

 certainly not characteristic of S. vulgaris ; but there is no 

 reference to it in the diagnosis ; the cells are described as 

 *' oval, moderately convex, smooth." The present species 

 seems to be common in the Adriatic and could hardly have 

 escaped notice. 



Primary cell ovate, smooth, with an oval aperture occupying 

 the upper part of the front, set round witli spines, of wliich 

 the one in the centre of the lower margin is taller than the 

 rest, slender, and bent inward over the opening. 



Range. Britain (chiefly south and west) ; Ireland (west 

 coast) ; Naples \ Madeira. 



Schizoporella Cecilii, Audouin. 

 ? Lein-alia Tenujiana, Heller, op. cit. p. 26, pi. ii. fig. 10. 

 I should unhesitatingly identify Heller's L. Perugiana with 



