500 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Genotype. Hippadenella (Flustra) margaritifera Quoy and Gaymard, 1833. 

 Recent. 



It seems to us that it would be better to classify this genus in the Hippoporae, 

 although all other authors are agreed in considering the genotype as belonging to 

 the genus PoreUa; we can not maintain it there, the frontal being a pleurocyst and 

 the apertura bearing cardelles. 



Family RETEPORIDAE Smitt, 1867. 



Anatomical bibliography. 1878. HINCKS, Notes on the Genus Retepora, Annals and Magazine 

 Natural History, ser. 5, vol. 1, pi. 19. 1S89. WATERS, Supplementary Report on the Polyzoa 

 collected by H. M. S. Challenger, pi. 3, figs. 5 to 13, 39, 40. 1892. WATERS, Observations on the 

 Gland-like Bodies in the Bryozoa, Linnean Society Journal, Zoology, vol. 24, pi. 19, fig. 14. 

 1894. WATERS, On Mediterranean and New Zealand Reteporidae and a fenestrate Bryozoan, 

 Linnean Society Journal, Zoology, vol. 25, pi. 7. 1903. JULLIEN, Bryozonires provenant des 

 Campagnes de VHironrleUe, pp. 36, 62. 1904. WATERS, Expedition antarctique beige, p. 77. pi. 

 6. 1909. LEVINSEN, Morphological and systematic studies on the Cheilostomntous Bryozoa, 

 p. 290, pi. 10, pi. 23, figs. 1, 2, 3. 1909. WATERS, Reports on the Marine Biology of the 

 Sudanese Red Sea. The Bryozoa, Linnean Society Journal, Zoology, vol. 31, p. 175, pi. IS. 

 1913. WATERS, Bryozoa from Zanzibar, Proceedings Zoological Society, London, pi. 72, figs. 1 to 

 11, p. 52 (classification). 



The ovicell is hyperstomial, much immersed in the distal zooecium ; it is largely 

 open into the peristomie. The zoarium is generally reticulate ; the dorsal face pre- 

 sents some projections or vibices without connection with the zooecia and contains 

 interiorly some kenozooecia (lacunae of Waters) more or less numerous ami 

 elongated. The reteporidan pore placed in front of the apertura is according to 

 its situation an ascopore or a spiramen: 11 to 16 tentacles. 



Figure 140 sums up our anatomical knowledge of this family. We are 

 ignorant of the larva and the generic classification is necessarily impossible to be 

 stated with exactitude. 



The classification has been given in 1892 and 1914 by Waters. We have given 

 names to the principal groups which he formed. Levinsen introduced into this 

 family the genera Schizotheca Hindis, 1880, and Rhynchozoon Hincks, 1891. It is 

 evident that the four genera formed by Waters are in rapport with the hydrostatic 

 system. It is now necessary for the zoologist to study the function of calcification 

 with all the care possible. 



Genus RETEPORA Imperato, 1599. 



1599. Retepora IMPERATO, Dell' historia naturale, libre XXVIII. 



" This group has a fissure in the ovicell. The proximal edge of the operculum 

 is nearly straight, and very similar throughout this group ; labial avicularia occur 

 in some but not in all. The oral glands are very well developed." (Waters.) The 

 reteporidan pore is a spiramen. 



Genotype. Retepora ceUulosa Linnaeus-Smitt, 1867. 



Range. Jacksonian : Eecent. 



