NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 405 



Hancock Stations: 316-35, Indefatigable Island, 0°33'35"S, 90° 10' 

 40"W, 20 fms; 136-34, Albemarle Island, 80 fms; 143-34 off Wenman 

 Island, 100 fms, and 147-34, Albemarle Island, 30 fms, Galapagos; 

 205-34, La Libertad, Ecuador, 8 to 12 fms. 



Smittina altirostris new species 

 Plate 47, figs. 9-10 



Encrusting on a shell. Zooecia characterized by the high, erect, 

 conical process on the median line proximal to the aperture; size mod- 

 erate, 0.40 to 0.50 mm long by 0.25 to 0.35 mm wide; distinct and 

 separated by deep grooves. The front is a tremocyst with relatively few 

 large pores over the whole surface, considerably ventricose even in com- 

 plete calcification. The primary aperture is broader than long, about 

 0.16 mm broad by 0.14 mm long; the lyrula very broad, straight across 

 the tip and the angles extended laterally into points. The suboral avicu- 

 larium is small, rounded with a semicircular mandible and is difficult to 

 observe beneath the high process. The secondary aperture is pyriform with 

 a rather broad sinus through which the lyrula may be seen, even in 

 older stages. The peristome is moderately thick-walled and extends to 

 the base of the process, enclosing the avicularium. Two or three small 

 distal spines may be present on the younger zooecia, but are very evan- 

 escent. The median frontal process is sharp-pointed, granular and white 

 at the tip; rarely there are two of these, one on either side of the mid- 

 line, and also not infrequently there is a similar but smaller process 

 distal to the aperture on the base of the succeeding zooecium. Frontal 

 avicularia are rare, but a small one with a triangular mandible is occa- 

 sionally present at the side of the peristome. 



Ovicell small, 0.20 mm wide, with radiate costal ridges and much 

 embedded. 



Type, AHF no. 84. 



Type locality, Nunivak Island, Alaska, one colony, 8 to 10 fms (no 

 further data). 



Smittina maccullochae new species 

 Plate 48, figs. 5-6 



Porella collifera, Canu and Bassler, 1923 :148. 



Zoarium encrusting, usually unilaminar, with a rough surface. The 

 zooecia are large and quite variable, ranging from 0.65 to more than 

 1.00 mm in length by 0.40 to 0.60 mm in width; the most noticeable 

 features being the coarse tremocystal front and the erect tubular peristome 



