BRYOZOA OF THE PHILIPPINE REGION 565 



aubcolony derived from an inferior subcolony. The tubes are 

 polygonal and intermingled with mesopores. The ovicell is sub- 

 orbicular, smooth, nonsalient, perforated by tubes adjacent or 

 isolated, placed on the head or capitulum. 



Measurements. — Width of larger flabellate colonies, 10 mm.; 

 height of same colonies, 9; diameter of tubes, 0.18-0.20. 



Affinities. — This species is much larger than Tretocycloecia parvula 

 and its flabellate form is very characteristic but its general structure 

 is identical. The peduncle may ramify and the capitulum engender 

 1 to 3 colonies. 



On our photograph the tubes are little apparent, but on other 

 specimens the mesopores are smaller and the tubes arc quite visible; 

 they are arranged as on the ovicell without any regularity. This 

 species belongs therefore in our genus Tretocycloecia , the importance 

 of which continues to increase with the more careful search for 

 ovicells. 



The capitulum of the subcolony is always obliquely arranged with 

 reference to the initial subcolony. 



Under the erroneous name of Fasciculipora ramosa D'Orbigny, 1839, 

 MacGillivray, 1888, figures a closely related form of analogous 

 structure which is less flabellate and in which the capitulum is not 

 lobed. Fasciculipora ramosa Busk, 1875 (not D'Orbigny 1839), 

 belongs to the same group with mesopores, but the ovicell is unknown 

 and Busk has not noted subcolonies developed eccentrically on the 

 capitulum. 



Occurrence. — 



D. 5147. Sulade Island, Sulu Archipelago; 5° 41' 40" N.; 120° 



47' 10" E.; 21 fathoms; co. S., Sh. 



D. 5577. Mount Dromedario, north of Tawi Tawi; 5° 20' 36" 



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



D. 5579. Sibutu Island, Darvel Bay, Borneo; 4° 54' 15" N.; 



119° 09' 52" E.; 175 fathoms; fine. S., co.; 13° C. 



Cotypes.— Cat. Nos. 8396, 8410, U.S.N.M. 



TRETOCYCLOECIA RAMOSA, new species 



Plate 92, figs. 1-8 



Description. — The zoarium is free, erect, very ramose; the fronds 

 are broad, with elliptical section arranged on the same plane and 

 ornamented with large polygonal pores on the dorsal; the base is 

 flabclliform attached to a fragment of shell or to a Serpula, with 

 a dorsal covered by a concentrically striated epitheca. The tubes 

 are polygonal and differ little from the mesopores. The ovicell is 

 large, with smooth surface, traversed by the tubes which are isolated 

 or in pairs. 



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