some Mediterranean Bryozoa, 99 



on in tlie same paper, he describes and figures H. circwn- 

 cincta, now., and H. spiVinga', nov. At one time, tluough an 

 error in binding, I was misled into tliiidcing H. circumcincta 

 was the first mentioned and therefore tlie type of Ilippo- 

 porina. Neviani also includes //. eda.v, Busk; H. tessidata, 

 Kss.; //. depressa, B. ; H. complanala, Norm. ; H. foliacea, 

 E. & S. ; H. palla si ana, ^MoW. Neviani also described the 

 genus as new in " Bri. foss. della Farnesina," Pal. Ital. 

 vol. i. p. 107 (1895), where he mentions first H. foliacea, 

 E. & S. — that is to say, in 1895 he described it as new in two 

 places, in one mentioning first foliacea^ in the other H, per- 

 tusa. Which of the papers was first published is not indi- 

 cated, though in Neviani^s ' Publicazione Diverse' the 

 "Bri. neoz." comes first. 



Canu *, in iiis "Bryozoaires des Terrains Tertiaires,'' in- 

 cludes under Hippoporina several fossil species, describing 

 or mentioning the ovicells in all but two, but unfortunately 

 his photographs only show them in three cases. H. angi- 

 stoma, Rss., is included, but with its small roundish oral 

 aperture it does not seem closely related to many of the 

 species mentioned by Neviani. 



Levinsen f places circumcincta in his genus Clieilopora, in 

 which some of the species have the ordinary and ovicel- 

 ligerous zooecia similar, but in circumcincta and pralucida 

 the ovicelligerous zooecia have diflferent and larger oral aper- 

 tures than the ordinary zooecia. One of my specimens of 

 prcelucida with an ovicell is from Tartary |, and an ovicell 

 lias not been referred to by anyone else. It is globular, 

 raised, perforated, and granular, about as wide as the 

 zooecium, and is not directly closed by the operculum, for, 

 as the ovicell is at a lower level than the operculum, connec- 

 tion with the ovicell is cut ofi" when the operculum closes the 

 oral aperture. The operculum of L. sincera has a nearly 

 strai<:;ht proximal edge with a thickened border parallel to 

 the distal edge, and the operculum of Cyclicopora prcelonga^ 

 Hincks, is very similar, so that it is unfortunate he gave the 

 name ]'ra'longa to two species which may have to come into 

 the same genus. 



At one time the dimorphism, as seen in circumcincta, would 

 have been thought sufficient reason for separating it gene- 



• Ann. de Pal^ontologie, vols, ii.-iv. p. 77. 



t Moi-ph. & Syst. Stud. p. 353. 



X The Tartary specimen has avicularia, as figured by Hincks, who, 

 however, says no avicularia j so perhaps he did not recognise that they 

 were avicularia, and in my specimens " from Singapore or the Philip- 

 pines " there are none. 



7* 



