BRYOZOA OF THE PHILIPPINE REGION 419 



This is the C. janthina group of Waters of which we have published 

 a text figure. 14 The genus differs from Hippoporidra in the trans- 

 formation of the pleurocyst into a tremocyst, in the different form 

 of the poster, and in the absence of linear attachments to the oper- 

 culum. The only known species are: 



Hippolremn (Lepralia) janthina Smitt, 1873 Florida. 



// i j'potrema (Lepralia) rotundora Normal), 1909 Madeira. 



Waters, 1899, and Norman, 1909, are not in accord on the charac- 

 ter of the second species. 



Genus HOLOPORELLA Waters, 1909 



HOLOPORELLA INFLATA, new species 



Plate 59, figs. 6-9 



Description. — The zoarium is free and unilamellar; it surrounds 

 delicate radicels or takes the form of a semiglobular mass. The 

 zooecia are very large, very convex; the frontal is garnished with 

 large and scattered tremopores. The apertura is suborbicular, 

 somewhat transverse; the peristome is thick and bears a salient, 

 avicularian umbo. The interzooecial avicularia are relatively small; 

 they have a pivot and their beak is spatulate. The deep zooecia 

 and the incomplete zooecia are rare. 



Measurements. — 



Apertura , „ nm Zooecia! diameter = 0.b5-0./o mm. 



1 hi - 0.25 mm. 



Affinities. — This species is very well characterized by its large 



dimensions and by its frontal tremopores; the presence of these 



latter differentiates it from Holoporella magnified Osburn. 



The interior shows a large frontal depression appearing like another 



superposed cell. Our largest colonies measure 20 by 12 mm., which 



is not at all in accord with the great size of the zooecia. All our 



specimens were dead. 



Biology. — Celleporidae with giant zooecia exist only in the tropical 



/.(tin 1 . 



Occurrence. — 



D. 5151. Sirun Island, Sulu Archipelago; 5° 24' 40" N.; 120° 



27' 15" E.; 24 fathoms: co. S., Sh. 



I). 5192. Jilantaguan Island, off northern (Vbu Island; 11° 09' 



15" N.; 123° 50' E.; 32 fathoms; green S. 



I). 5577. Mount Dmmedario, north of Tawi Tawi; 5° 20' 36" 



V; 119° 58' 51" E.J 240 fathoms; crs. S.; 12.4° C. 



Cotypes. Cat. Xos. 8228, 822'.), I'.S.N.M. 



una and Bassler, 1820, p. 615, fi?. is.i. 



