BRYOZOA OF THE PHILIPPINE REGION 221 



Genotype. — FlabeUaris (Cellaria) flabellum Ellis and Solander, 1786. 

 Recent (Southern Hemisphere). 



The synonymy of the genotype being under dispute (see Harmer, 

 1923, p. 340), another species might have been chosen. The species 

 of Craspedozoum MacGillivray, 1886, belong to this genus. 



We believe like Waters, 1913, that FlabeUaris would be better 

 classified in the Alderinidae. 



FLABELLAKIS CRASSL'M, new species 



Plate 10, figs. 10-13 



Description. — The zoarium is free and nonarticulate in appearance, 

 very thick, formed of two ranges of alternate zooecia. The dorsal 

 face is almost flat, smooth, slightly hollowed by furrows limiting the 

 zooecia. On the cellular face the zooecia are little distinct, hexago- 

 nal, elongated, provided with a gymnocyst, more or less long; the 

 mural rim is very thick. The exterior opesium is large, elliptical, 

 little elongated; the interior opesium is smaller and subcircular. 

 The frontal avicularium is small, triangular, nonsalient, without 

 pivot or denticles. The ovicell is large, very convex, smooth, buried 

 on the distal zooecium, certainly closed by the opercular valve. 



Measurements. — 



„ . , fAo = 0.25mm. „ . [is = 0.65.0.70 mm. 



External opesium ■' Zooecia,, 



lio = 0.20-0. 2d mm. Us = 0.40 mm. 



Affinities. — This species resembles very much Menipea lineata 

 MacGillivray, 1895, but differs from it in its nonoval opesium and 

 in its greater dimensions. It differs from Menipea innocua Waters, 

 1881, of the Australian Miocene in its bifurcated branches, its nar- 

 rower mural rim, and its smaller measurements. 



All our specimens were dead and the variations are considerable. 

 Occurrence. — 



D. 5574. Simaluc Island, north of Tawi Tawi; 5° 30' 45" N.; 120° 



07' 57" E.; 340 fathoms. 

 D. 5579. Sibutu Island, Darvel Bay, Borneo; 4° 54' 15" N.; 119° 



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

 D. 5580. Sibutu Island, Darvel Bay, Borneo; 4° 52' 45" N.; 119° 

 06' 45" E.; 162 fathoms; br. s., co.; 13.2° C. 

 Cotypes— Cat. Nos. 7904, 7905, U.S.N. M. 



MONARTRON, new genus 



Greek monos, single; artron, articulation. 



The zoarium is articulated. The segments are monoserial at their 

 base and bound to rnc\\ other by a single chitinous joint. The rami- 

 fication appears (1) on the tricellular segments by the appearance of 

 an intercalated zooecium emitting proxunally a single divergent 

 zooecium, (2) occasionally by a lateral budding on a zooecium. 



