10 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.76 



small triangular avicularium with rounded beak. In the marginal 

 zone of the colony, in the separating furrows of the cells, there are 

 small elliptical zooeciules perforated by a submedian pore. On the 

 margin itself, the zooeciules develop exclusively and artest the for- 

 mation of the normal zooecia. 

 Measurements . — 



rA(?=0.40mm. fZs=0.50 mm. 



Opesium j j^ _ 25 mm. Zooecmm | ^^ _ 0.30-0.35 mm. 



Affinities. — The function of the small zooeciules is absolutely un- 

 known. They have been observed in several species ; in Mystriofora 

 areolata Canu and Bassler, 1923, from the Pleistocene of California, 

 in CalJopora pumicosa Canu and Bassler, 1928, recent species from 

 the Gulf of Mexico, and in Electra disteffimoi^ Cipolla, 1923, of the 

 Sicilian of Italy. They appear to have a small polypide since they 

 undergo the phenomenon of total regeneration. Our photographs 

 show several examples. Adventitious zooeciules somewhat more 

 elongated in form have also been observed in other genera of the 

 bryozoa. 



Occurrence. — Galapagos Islands, D. 2813. 



Holotype.—Qiit. No. 84T5, U. S. N. M. 



Genus CAULORAMPHUS Norman, 1903 



CAULORAMPHUS BRUNEA, new species 



Plate 1, Figures 9, 10 



Description. — The zoarium incrusts dead Cellepores. The zooecia 

 are distinct, elongated, separated by a very deep furrow, somewhat 

 oval. The mural rim is thick, rounded, very salient. It bears 4 

 distal spines and 7-9 pairs of brown, areal spines. The pedunculate 

 avicularia are white, a little longer than the spines. The ancestrula 

 is a very small ordinary zooecium. 



Measuremen ts . — 



fAo=0.30 mm. fZ3= 0.40-0.45 mm. 



Opesium I ^^_(j;^5 mm. ^ooeciumj^^^O 3q ^^^^^ 



Affinities. — This species is very well characterized by the brown 

 spines. They are white in C auloraviphus spinifer Johnston, 1847, 

 which is the closest species. 



Biology. — This is a sordid species for the living specimens, in spite 

 of their large number of spines are always covered with calcareous 

 granules, siliceous particles, fragments of sponges, and of dirt. It 

 is difficult to find a specimen that can be photographed. By boiling 

 in Javelle water the cells when completely freed from their spines and 

 all the dirt have on the contrary a most agreeable aspect and resemble 

 little crowns. 



