BRYOZOA OF THE PHILIPPINE REGION 327 



the eardelles are hardly visible; the ovicell is lacking. It is then 

 doubtfully that we class it in Hippo pleurif era. However, the struc- 

 ture of the frontal and the aspect of the avicularia are indeed of this 

 genus. 



The great deep, near Tawi Tawi (D. 5577), which has furnished 

 us many giant species, affords great biological interest. Further 

 dredgings there are most desirable. 



Occurrence. — D. 5577. Mount Dromedario, north of Taw T i Tawi; 

 5° 20' 36" N.; 119° 58' 51" E.; 240 fathoms; crs. S.; 12.4° C. 



Holotype.—C&t. No. 8092, U.S.N.M. 



Subfamily PERISTOMELLAE Canu and Bassler, 1917 



Genus PERISTOMELLA Levinsen, 1902 



PERISTOMELLA COCCINEA Abildgard, 1805 



Plate 38, fig. 4 



1920. Peristomella coccinea Canu and Bassler, North American Early Tertiary 

 Bryozoa, Bull. 106, U. S. National Museum, p. 409, pi. 87, fig. 18 

 and 14 (bibliography, geologic and geographic distribution). 



Although rather common, the biology of this species still remains 

 to be studied. Our specimens were dead. 

 Occurrence. — 



D. 5150. Sirun Island, Sulu Archipelago; 5° 23' 20" N.; 120° 



35' 45" E.; 21 fathoms; co. S., Sh. 

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

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

 Plesiotypes — Cat. Nos. 8093, 8094, U.S.N.M. 



Genus DIDYMOSELLA Canu and Bassler, 1920 



We created this genus basing it upon a fossil form of the American 

 Vicksburgian very close to Porina larvalis MacGillivray. We have 

 had the good fortune to discover two recent species which confirm 

 our interpretation of 1920. As these species were entirely deprived 

 of chitinous appendages we are not able to add many new observations. 



Didymosella is a tropical genus of shallow waters although it does 

 not fear a depth of 372 meters. We have already noted the elevation 

 of the sea bottom in the Vicksburgian and the presence of Didymosella 

 is only another proof. When we know the biology of the bryozoa 

 better we can then easily study the oscillation of the sea bottom. 



DIDYMOSELLA PARVIPORA new species 



Plate 39, fig. 1 



Description. — The zoarium is unilamellar or encrusting shells and 

 nullipores. The zooecia are little distinct, separated by a furrow or 

 by a very small thread, elongated, swollen; the frontal is convex and 



