NO. 1 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 11 



Family Aetcidac Smitt, 1867 



Genus Aetea Lamouroux, 1812 



Genotype, Sertularia anguina Linnaeus, 1758:816 



Key to the Species 



1. Zooecial tube coarsely wrinkled or corrugate ligulata 



Zooecial tube very finely or not all annulate. 2 



2. Erect tube entirely without annulations truncata 



Very fine annulations present 3 



3. Terminal expansion spoon-shaped, base not annulated. . . anguina 

 Terminal expansion narrower, basal expansion also finely 



annulated , recta 



Aetea anguina (Linnaeus), 1758 

 Plate 1, fig. 3 



Sertularia anguina Linnaeus, 1758 :816. 

 Aetea anguina, Robertson, 1905 :244. 

 Aetea anguina, O'Donoghue, 1926 :39. 

 Aetea anguina, Hastings, 1930 :702. 



This little creeping species is practically cosmopolitan and has been 

 listed in nearly every paper dealing with shorewise Br>^ozoa in the tem- 

 perate and tropical regions. 



The stolonate portion adheres to stems of hydroids, algae, other bryo- 

 zoans and occasionally to shells and pebbles. The erect tube is often bent 

 or curved snake-like and the expanded terminal portion has somewhat the 

 shape of a snake's head, so that Ellis in 1755 named it the "snake coral- 

 line." The "head," stalk and basal portion all appear to be very finely 

 punctate and the stalk finely annulated. It must be noted, however, that 

 there are no punctations but instead there are minute tubercles which, 

 under transmitted light, appear to be punctures. A flat membranous area 

 occupies one side of the "head" and at the distal end of this area is the 

 operculum which is also thickly "punctate." The ovicell is rarely ob- 

 served, and apparently it is quite evanescent. I have found it on a few 

 occasions with the embryo surrounded by a very delicate membrane 

 which evidently disappears after the discharge of the ciliated larva. 



Robertson noted its presence at San Pedro and San Diego, Cali- 

 fornia ; O'Donoghue recorded it from Puget Sound, and Gabriola Pass, 

 British Columbia, and Hastings listed it from the Galapagos Islands. 

 On the east coast of the Americas it is a common species from Maine 

 (Osburn 1933:18) to Brazil (Marcus 1937: 26). Cosmopolitan. 



