334 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



This species differs from Microporella diadema MacGillivray, 1895, 

 and its varieties in the arrangement of its frontal ornament and its 

 ascopore. 



Structure. — In the interior there is a thick olocyst and the ascopore 

 is very small. The operculum is quite complicated and variable. 

 The central armature is opaque, transparent or absent. The man- 

 dible is falciform. 



Biology. — Our specimens were almost all living and were in repro- 

 duction and fixation in February and March, 1908 (36-55 meters). 



The color of the ectocyst is not constant and depends either on the 

 substratum or on some unknown cause; mimicry in the bryozoa is 

 very frequent in the tropical seas. 



This is a species of shallow water and it becomes very rare in greater 

 depths. In order to develop its ornament, the waters must be calm. 

 Occurrence. — 



D. 5137. Jolo Light, Jolo; 6° 04' 25" N.; 120° 58' 30" E. 



20 fathoms; S. Sh. 

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



co. S. 

 D. 5144. Jolo Light, Jolo; 6° 05' 50" N.J 121° 02' 15" E. 



19 fathoms; co. S. 

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



120° 47' 10" 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. 

 D. 5174. Jolo Light, Jolo; 6° 03' 45" N.J 120° 57' E.; 20 



fathoms; crs. S. 

 D. 5179. Komblon Light, Romblon; 12° 38' 15" N.J 122° 12' 



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

 D. 5577. Mount Dromedario, Tawi Tawi; 5° 20' 36" N.; 119° 

 48' 51" E.; 240 fathoms; crs. S.; 12.4° C. 

 Cotypes.—C&t. No. 8110, U.S.N.M. 



CALLOPORINA SCULPTA, new species 



Plate 40, figs. 7, 8 



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

 tinct, separated by a furrow, somewhat elongated, hexagonal; the 

 frontal is admirably sculptured; it bears infundibuliform areolar 

 pores, a salient concave, oblique peristome supporting the ascopore 

 with a salient peristome, and two longitudinal triangular avicularia 

 arranged symmetrically on each side of the ascopore. The apertura 

 is semilunar, the peristome is salient and bears 6-7 hollow spines. 



Measurements. — 



A . fk-0.08mm. „ . /Zz -0.40 mm. 



Apertura-L ^ nr , Zooecia 7 „ or . » nr ,_ 



v Ua =0.07 mm. \lz =0.30-0.35 mm. 



