CTETOPORA, OSCULIPORA. 
57 
Eeverse face smooth, or marked by linear interzooecial depressions. 
Gonoecia, ovoid bodies which usually project from the zoaria, and 
may appear as separate attached bodies. 
Type Species. 
Rctepora truncata, Goldfuss, 1827. Petref. Germ. vol. i. p. 29, 
pi. ix. fig. 14. 
Affinities. 
There has been unfortunate confusion in the use of the name of 
this genus, as the Retepora truncata of Goldfuss has been used as 
the type of both Osctdipora and Truncatula. That species has been 
generally regarded as a typical Truncatula^ but it was selected by 
d’Orhigny in 1849 as the type of Osculipora, for it was the 
only species that he then mentioned as belonging to that genus. 
Retepora truncata^ Goldf., must, therefore, he accepted as the type 
species of Osctdipora. Yon Hagenow, however, unfortunately 
overlooked Osctdipora, and founded Truncatida ^ for the species 
truncata of Goldfuss and for two new species of his own, T. Jilix 
and 2\ repens. Another objection to Truncatida is that it is 
quoted by Scudder as having been preoccupied by Leach. 
There can be no doubt that Osctdipora must stand for the species 
truncata, and unless Truncatula be retained for one of the other 
species it cannot he retained for Bryozoa. In Osculipora truncata 
the zooecia are grouped in round bundles, and the zoarium has 
a smooth or ribbed surface ; whereas in von Hagenow’s Truncatida 
repens the apertures not only open in linear series, hut the reverse 
surface of the zoarium is perforated by abundant pores. The 
examination of young and well-preserved specimens of T. repens 
shows that its reverse surface is normally closed, and that the pores 
are only due to the wearing away of the walls of the zooecia. 
The openings are of the same nature as in von Hagenow’s figure of 
the reverse surface of his Idmonea tetrasticlia (Bry. maastr. Kr- 
pi. hi. fig. 3^), which is only a very worn 0. truncata. 
The Truncatula of von Hagenow must, therefore, be merged in 
Osculipora. D’Orbigny has retained Truncatula for some species 
of Cytisidae ; he attributed the genus to von Hagenow, but only 
Yon Hagenow. Bry. maastr. Kr. 1851, pp. 34-6. 
