156 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



operculum is detachable. Spines on the peristome. There is a very 

 small polypidian lamella in the apertura. 



Genotype. — Monoporella nodulifera Hincks, 1881. Recent, Bass 

 Strait. 



Range. — Cretaceous (Campanian) — Recent. 



The polypidian lamella is a fragment of an incomplete polypide 

 tube. 



The figure of Monoporella nodulifera Hincks, 1881, is quite inade- 

 quate and the structure of this species would have remained unknown 

 without the studies made by Harmer in 1926. We can not subscribe 

 to the introduction of the genus in the Microporidae because the 

 ovicell is clearly hyperstomial and even of a special type. In awaiting 

 studies of the larva we have classed it in the Aspidostomatidae. It is 



I 



B ^p^ 



A C 



Fig. 39. — Genus Monoporella Hincks, 1881 



A-C. Monoporella nodulifera Hincks, 1881. A. Zooecia and ovicell, enlarged. 

 B. Zooecia. C. Operculum. (After Harmer, 1926.) 



a tropical genus. The known species of this new genus are as follows, 

 the first five without question and the last four very probably: 



Monoporella fimbriata Canu and Bassler, 1927 Recent, Philippines. 



Monoporella nodulifera Hincks, 1881 Recent, Bass Strait. 



Monoporella tenuimargo, new species Recent, Philippines. 



Monoporella (Lepralia) venusta Eichwald, 1868 Miocene (Helvetian, Tor- 



tonian) . 



Monoporella (Micropora) carinata Maplestone, 1900__ Miocene. 



Monoporella (Micropora) convexa Canu, 1911 Cretaceous (Rocanean). 



Monoporella (Hippoporina) planulata Canu, 1911 Cretaceous (Rocanean). 



Monoporella (Homalostega) exsculpta Marsson, 1887- _ Cretaceous (Campanian). 



MONOPORELLA FIMBRIATA Canu and Bassler, 1927 



Plate 17, figs. 6-11 



1927. Monoporella fimbriata Canu and Bassler, Classification Cheilostomatous 

 Bryozoa, Proc. U. S. Nat. Mus., vol. 69, Art. 14, p. 4, pi. 1, fig. 2. 



