306 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



3. Aperture transverse, sinus narrow ; frontal pores large . . limbata 

 Aperture round, sinus broad and shallow; frontal pores small; 



ovicell thick walled and umbonate distincta 



4. Aperture subcircular with a narrow sinus; ovicell with a single 



large pore sinuosa 



Aperture transversely elliptical, its proximal border nearly straight ; 

 ovicell with a few small pores abyssicola 



Stomachetosella sinuosa (Busk), 1860 

 Plate 34, fig. 3 



Lepralia sinuosa Busk 1860 : 125. 

 Schizoporella sinuosa, Hincks, 1884:17. 

 Stomachetosella sinuosa, O'Donoghue, 1926:62. 

 Stomachetosella sinuosa, Osburn, 1933:36. 

 Schizoporella perforata, Canu and Bassler, 1929:318. 



The zoarium is encrusting, usually forming round colonies on shells, 

 the color ranging from a delicate rose, in young specimens, to deep 

 purple in old colonies. The zooecia are moderately large, 0.50 to 0.70 

 mm long by about 0.40 mm wide; the front is a little inflated, with 

 large tremopores, and very heavily calcified. The primary aperture is 

 subcircular with a proximal sinus ; the secondary aperture is more or less 

 orbicular with a proximal notch which varies considerably in size and 

 form ; in the young stage there is a low smooth peristome but this soon 

 becomes covered by the encroachment of the thick frontal layer. The 

 ovicell is hyperstomial, deeply immersed, somewhat flattened, with a 

 large, rounded pore on the top. No avicularia, no spines, no dietellae. 



In the ovicelled zooecia the border of the aperture is elevated slightly 

 into a thick rim which is connected with the sides of the ooecium. 



It is a common northern species, extending on the Atlantic coast as 

 far south as Cape Cod. Reported by Hincks from Queen Charlotte 

 Islands and by O'Donoghue from Puget Sound and numerous localities 

 along the British Columbia coast. 



Punuk Island, Alaska, Bering Sea ; common at Point Barrow, Arctic 

 Research Laboratory, G. E. MacGinitie, collector; and taken at Middle 

 Bank, Puget Sound by Dr. J. L. Mohr. 



Stomachetosella cruenta (Norman), 1864 

 Plate 34, fig. 1 



Lepralia cruenta Norman, 1864:88. 

 Schizoporella cruenta, Hincks, 1884:40. 

 Schizoporella cruenta, O'Donoghue, 1926:55. 



