BRYOZOA OF THE PHILIPPINE REGION 381 



D. 5478. Tacbuc Point, Leyte; 10° 46' 24" N.; 125° 16' 30" 



E.; 78 fathoms; Sh. 

 D. 5577. MountDromedario, north of Tawi Tawi; 5°20' 36" N.; 



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

 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. 8174-8181, U.S.N.M. 



ADEONELLA GIBBERA, new species 



Plate 52, figs. 3-8 



Description. — The zoarium is free, bilamellar violet colored; the 

 fronds are compressed, of little width, bifurcated. The zooecia are 

 distinct, separated by a deep furrow, elongated, irregularly elliptical; 

 the frontal is smooth, gibbose, surrounded by parietal dietellae. 

 The peristomice is suborbicular, a little transverse or elongated; the 

 spiramen is very large and placed in the immediate vicinity of the 

 apertura. The frontal boss bears the point of a small very salient 

 and triangular avicularium. The marginal zooecia have a tremocyst 

 and do not bear avicularia. Sometimes at the bifurcations there is a 

 large interzooecial avicularium. The gonoecia have a transverse 

 peristomice. 



Measurements. — 



Peristomice f Tip -=0.08 mm. Peristomicef7ip =0.06 mm. 



(ordinary) 1^=0.06-0.08 mm. (gonoecia) lip =0.10 mm. 



. \Lz =0.36-0.40 mm. 

 Zooecia-^ A nn A nA 



[lz =0.20-0.24 mm. 



Affinities. — This species differs from Adeonella minutipora in ap- 

 pearance very slightly and the eye must be well trained to see it. 

 With a little attention it is however easy to note that it differs in the 

 presence of a single avicularium and especially in a large peristomice; 

 the fronds are smaller and narrower; finally there are never two oral 

 avicularia. 



The spiramen, although very large exteriorily, appears on the con- 

 trary rather narrow in sections. The frontal is much thickened and 

 parietal dietellae appear under the form of tubes with expanded walls. 

 Occurrence. — 



D. 5141. Jolo Light, Jolo; 6° 09' N.; 120° 58' E.; 29 fathoms; 



co. S. 

 D. 5162. Tinagta Island, Tawi Tawi Group; 5° 10' N.; 119° 



47' 30" E.; 230 fathoms; S. brk., Sh. crs.; 11.6° C. 

 D. 5179. Romblon Light, Romblon; 12° 38' 15" Ni; 122° 12' 

 30" E.; 37 fathoms; hard S.; 24.2° C. 

 Cotypes.— Cat. Nos. 8182, 8183, U.S.N.M. 



