18 PROCEEDINGS OF THE NATIONAL MUSEUM vol.76 



has two lips juxtaposed at their extremities, the extremities of the 

 anter included between those of the poster. The genotype has never 

 been rediscovered alive. Canu and Bassler, 1920, have extended its 

 limits to all the Schizoporellas in which the hyperstomial ovicell is 

 closed by the operculum and in which the frontal is a tremocyst. 

 Unfortunately their text figure was erroneous in consequence of a 

 poor interpretation of certain published figures. 



Dakaria sertata rigorousl}^ agrees with their definition and can 

 take the place of the genotype in which the ovicell and operculum are 

 unknown. 



The operculum is white, rather thick; its proximal border is tri- 

 angular and of a different form from that of the apertura. It is 



surrounded by a thick band 

 like that in Lepralia mont- 

 ferrandi Audouin, 1826, fig- 

 ured by Waters, 1909, which 

 A B C is classed in the group we 



have called Codonella. This 



Figure 2. — Dakakia sertata, new species. -. p , . ,. 



Three forms of opercula, X 85 10™! of operculum IS peculiar 



enough to justify the forma- 

 tion of a special genus if that of the genotype was not identical. 

 SchizoporeUa timnescens Ortmann, 1890, from Japan, seems to us to 

 belong to the same group, but its peristome is not festooned. 



This species differs from Codonella granidata^ new species which is 

 very similar in general aspect in the absolute absence of avicularia. 



Biology. — Almost all of our specimens were living and ovicelled. 

 The species was in reproduction April 7-9, 1888. With its peristome 

 enlarged and festooned, it is a very elegant species and easy to de- 

 termine. 



Occurrence. — Galapagos Islands, D. 2813 and D. 2815. 



Cotypes.—C^t. Nos. 8487, 8488, U.S.N.M. 



Genus HIPPOPORINA Neviani, 1895 



HIPPOPORINA CLEmOSTOMA Smitt, 1873 



1873. Lepralia cleidostoma Smitt, Florida Bryozoa, Kongl. Svenska Vetenskaps 

 Akadeiniems Hacdlingar, vol. 11, p. 62, pi. 11, figs. 217-219. 



1928. Eippoporma cleidoitoma Canu and Basslek, Fossil and Recent Bryozoa 

 of the Gulf of Mexico Region, Proc. U. S. National Museum, art. 2710, 

 p. 104, pi. 9, fig. 7, pi. 32, fig. 5. 



Measurements. — 



. , fAa=0.14 mm. „ . fZs = 0.44 mm. 

 Apertura , „.„ Zooeciiim , „ ^ „ 



[ta=0.10mm. [ Z3=0.30 mm. 



Affinities. — Our specimens incrusted shell fragments, Lithothmn- 

 nion and Cellepores. They generally conform well to the figures of 

 Smitt, 1873. Some of our specimens have appeared doubtful, but 



