128 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL, 14 



Zooecia alternating in two series, except for the axial zooecium which 

 makes three below a bifurcation; moderately large, 0.60 to 0.78 mm 

 long, by 0.30 to 0.40 mm wide, narrowed slightly at the base ; the opesia 

 long elliptical, broadest and nearly straight across the distal end; there 

 is a narrow gymnocyst, the mural rim is thin and high, the descending 

 cryptocyst well developed and finely beaded ; a short stout spine on the 

 outer distal angle and occasionally a smaller one on the inner angle. 



Four types of avicularia are present, frontal, lateral, dorsal and axial 

 (dorsal) : (1) the frontal avicularia, on nearly every zooecium, are situ- 

 ated on the inner corner of the gymnocyst, usually small with a triangu- 

 lar mandible but occasionally they are somewhat larger (scarcely "giant") 

 and with a longer mandible; (2) lateral avicularia, small with a hooked 

 triangular mandible, present on nearly all of the zooecia; (3) the dorsal 

 avicularia (somewhat vibraculoid in appearance) are at the extreme 

 bases of the zooecia, the chamber is short and nearly as wide as the zooeci- 

 um, its mandible triangular at the base and ending in a long, fine point, 

 0.20 to 0.25 mm long and directed more or less transversely across the 

 branch ; the radicle chamber is at the outer side of the avicularian cham- 

 ber and fused with it; (4) the axial avicularium is similar in structure 

 to the other dorsal avicularia but is located near the distal end of the 

 axial zooecium and its mandible is directed proximally. 



The ovicell is directed in line with the zooecial axis, large, about 

 0.40 mm wide by 0.25 mm long, rather deeply embedded in the succeed- 

 ing zooecium, thin walled and the surface decorated with fine concentric 

 lines. 



The absence of a scutum throws this interesting species into the small 

 group with A. antarctica (Kluge) and A. pateriformis (Busk), but both 

 of these species are multiserial, the ovicells are different, the frontal avicu- 

 laria of pateriformis are larger and more elevated, and those of antarctica 

 are paired. Neither Busk nor Kluge mentions the presence of a dorsal 

 axial avicularium. 



Type,AHFno.31. 



Type locality, Hancock Station 1422-41, east of Long Point, Catalina 

 Island, California, 33°24'55''N, 118°13'25"W, 250 fms, one colony at- 

 tached to a small pebble. 



