some Mediterranean Bryozoa. 99 



on in the same paper, he describes and figures H. circum- 

 cincta, no v., and II. spilingce, nov. At one time, through an 

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

 was the first mentioned and therefore the type of Hippo- 

 porina. Neviani also includes H. edax, Busk ; H. tessulata, 

 E,ss.; 77. depressa, B. ; H. complanata, Norm. ; H. foliacea, 

 E. & S. ; H. pallasi'ana, Moll. Neviani also described the 

 genus as new in "Bii. 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 his " Bryozoaires des Terrains Tertiaires," in- 

 cludes under Hippoponna several fossil species, describing 

 or mentioning the ovicells in all but two, but unfortunately 

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

 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 Cheilopora, in 

 which some of the species have the ordinary and ovicel- 

 ligerous zocecia similar, but in circumcincta and praelucida 

 the ovicelligerous zocecia have different and larger oral aper- 

 tures than the ordinary zocecia. One of my specimens of 

 prwlucida with an ovicell is from Tartary \, and an ovicell 

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

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

 zocecium, 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 off when the operculum closes the 

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

 straight 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 pradonga 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. 



f Morpk. & Syst. Stud. p. 353. 



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

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

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

 pines " there are none. 



7* 



