BRYOZOA OF THE PHILIPPINE REGION 323 



the anter is a largo oval arch distinct from the peristomie; the poster 

 is very short and reduced to a simple concavity. The ovicell is 

 convex, short, transverse, verrucose and can not be closed by the 

 operculum. Some zooecia bear on the frontal a large oblique ellipti- 

 cal avicularium with pivot. 

 Measurements. — 



Apertu»(*° = ' 22 """• Zooeciaj, 12 =0.75-0.85 mm. 



Ua =0.20 mm. \lz =0.60 mm. 



Affinities. — There is a great difference in the size of the zooecia in 

 this species from all the other known species. We may therefore 

 doubt our generic determination but we have not enough specimens 

 to clarify this point. The only important difference that we have 

 seen exteriorily, is the presence of a large frontal avicularium on some 

 zooecia a character of doubtful generic order. 



Biology. — Our specimens were dead. Those from Jolo dredged in 

 shallow waters have much smaller warts and a less thickened frontal. 

 Occurrence. — 



D. 5145. Jolo Light, Jolo; 6° 04' 30" N.; 120° 59' 30" E.; 



23 fathoms; co. S., Sh. 

 D. 5574. Simaluc Island, north of Tawi Tawi; 5° 30' 45" N.; 

 120° 07' 57" E.; 340 fathoms. 

 Eolotype.— Oat. No. 8088, U.S.N.M. 



Genus HIPPOMENELLA Canu and Sassier, 1917 



HIPPOMENELLA REPUGNANS, new species 



Plate 38, figs. 1, 1' 



Description. — The zoarium encrusts shells. The zooecia are dis- 

 tinct, separated by a deep furrow, very large, elongated, deformed 

 laterally and superiorily by two very long narrow, arched avicularia; 

 they are poorly ornamented and sometimes arranged in opposite 

 directions; the frontal is convex, smooth in the middle, perforated 

 laterally by a large number of tremopores. The apertura is elon- 

 gated, ovoid, provided with two salient cardelles placed in the inferior 

 third; the anter is very large; the poster is small and narrow; the 

 peristome wide and little salient, bears 10 to 12 spines. The ovicell 

 is relatively small, embedded in the distal zooecium. It opens above 

 the operculum by a narrow slit; it bears two large frontal areas sur- 

 rounded by a salient collar and closed by a very fragile, perforated, 

 calcareous membrane. 



Measurements. — 



A^rtnrJ^" ' 241 ™' V „' i Lz ^ 1 .00 XX1XXI . 



Apertura 7 „ Zooecia-L 



\la =0.18 mm. Xlz =0.70 mm. 



Affinities. — Wo know only two recent species of the genus IIi/>- 

 pomenella so common in the Eocene and Oligoccne of America. The 



