424 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Godonellina cribriformls (O'Donoghue), 1923 

 Plate 46, fig. 16 



Porella cribriformls O'Donoghue, 1923 :42 ; 1926 :72. 

 Codonella cribrifonnis, Canu and Bassler, 1930:29. 



O'Donoghue's description is good, but incomplete; his figure 30, 

 plate 4, is excellent. Zoarium encrusting. Zooecia moderate in size, 0.50 

 to 0.65 mm long by 0.30 to 0.40 mm wide, long ovate to hexagonal, 

 somewhat ventricose and very distinct, sometimes with a raised separating 

 line. The frontal is a moderately thick tremocyst with large, regularly 

 spaced pores, shining, hyaline in younger stages, smooth to slightly 

 granular. The aperture is nearly circular, 0.13 by 0.13 mm, with small 

 cardelles between which the broad shallow poster extends, slightly arcu- 

 ated. The operculum is a little chitinized, with a narrow brownish 

 bordering sclerite; muscle attachments near the border. The peristome 

 is thin, moderately elevated all around the aperture, without spines and 

 fusing with the avicularian chamber proximally. The median suboral 

 avicularium is elevated, the mandible usually semicircular but sometimes 

 considerably enlarged and short-spatulate ; the avicularian chamber is 

 connected with lateral pores on both sides around the base of the peristome 

 by small tubes to lateral pores, as it is in Porella. 



The ovicell is hemispherical, partially embedded, a little flattened 

 on the upper surface, with numerous pores which vary in size and form ; 

 slightly collared about the base ; 0.26 mm wide. 



Described by O'Donoghue from Departure Bay and listed by him 

 from several other localities in British Columbia and from the San 

 Juan Islands in Puget Sound, 15 to 35 fms. 



Specimens in the Hancock collections are from Cadboro Bay, British 

 Columbia. 



Genus RHAMPHOSTOMELLA Lorenz, 1886 



Aperture with an asymmetrical poster and a lyrula ; frontal an olocyst 

 with costules; a large oblique avicularium excentrically placed below 

 the aperture; ovicell hyperstomial, prominent and closed by the oper- 

 culum. Genotype, R. costata Lorenz, 1886:12. 



The lyrula is variable in size and wanting in some species; the 

 primary aperture is not always asymmetrical; oral spines are present 

 in at least one species, and frontal avicularia are sometimes present. Most 

 of the species are arctic or at least northern in distribution. 



