470 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



scattered pores and nearly smooth. The primary aperture is nearly semi- 

 circular, about 0.10 mm long by 0.12 mm wide, the proximal border 

 straight or slightly arcuate, no cardelles. The operculum is moderately 

 chitinized, has the form of the aperture and a narrow bordering sclerite. 

 The primary peristome is low and thin ; the frontal forms a low secondary 

 peristome around the sides and distal border but this is entirely wanting 

 on the proximal border; no spines. There are three avicularia on every 

 zooecium, one on each side opposite the proximal border of the aperture 

 and the third in the median line immediately distal to the aperture; 

 the three form an equilateral triangle and all of them arise from areolar 

 pores as shown by their development; the lateral avicularia are pointed 

 but shorter than in E. manica and the median one is larger than in that 

 species. 



No ovicell. 



The species is similar to E. manica in most respects but is smaller, 

 smoother, the tremopores are smaller and more scattered, the lateral 

 avicularia are smaller and the median one larger, its base about as large 

 as that of the lateral ones. The single specimen of E. plana is entirely 

 encrusting in a single layer. 



Type, AHF no. 102. 



Type locality, Hancock Station 1257-41, 3 miles NW of Natividad 

 Island, Lower Cahfornia, 27°44'17''N, 115°15'58"W, at 30 fms. 



Genus GRYPTOSULA Canu and Bassler, 1925 



There is no external evidence of an ovicell, the larva develops in 

 the distal end of the zooecial chamber. The frontal is a pleurocyst with 

 large pores. The aperture is a little elongate, the poster wider than the 

 anter; the operculum bears a long sclerite on each side slightly within 

 from the border and the muscle attachments are near the border. Geno- 

 type, Eschar a pallasiana Moll, 1803. 



Avicularia are sometimes present and a suboral umbonate process 

 often occurs; in extreme calcification the frontal pores become widely 

 infundibuliform. There are no oral spines, 



Cryptosula pallasiana (Moll), 1803 

 Plate 57, figs. 4-5 



Eschara pallasiana Moll, 1803:57. 

 Cryptosula pallasiana, Canu and Bassler, 1925 :33. 

 Lepralia pallasiana, Osburn, 1912 :240 ; 1933 :43. 

 Lepralia pallasiana, O'Donoghue, 1925 : 19. 



