438 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Eschar ella labiata, Levinsen, 1916:451. 

 Escharella labiata, Nordgaard, 1918:55. 



Zoarium encrusting on stones and shells. The zooecia are large, 

 0.75 to 0.90 mm long by 0.40 to 0.50 mm wide, highly arched and 

 elevated distally, very distinct; the frontal densely and minutely gran- 

 ulated, with 1 to 3 rows of small lateral pores. The primary aperture 

 is semicircular, 0.18 to 0.20 mm wide, the proximal border straight 

 with a broad, short lyrula. The peristome is high proximally, extending 

 almost vertically into a rounded or pointed process, descending sharply 

 on the sides to the oral spines; in the presence of an ovicell it fuses 

 around the spines with the ooecial cover. The spines are strong and 

 erect or somewhat bent over the aperture, 1 pair. 



The ovicell is large, 0.30 to 0.35 mm wide by about 0.30 mm long, 

 more or less hemispherical and the distal end is often sloped downward 

 toward the base of the succeeding zooecium. 



It has been recorded from numerous localities from the Kara Sea to 

 Greenland, but has not hitherto been known from the Pacific area of 

 the Arctic Ocean. It is undoubtedly another circumpolar species. 



Point Barrow, Alaska, 18 fms, G. E. MacGinitie, collector, Arctic 

 Research Laboratory. 



Mucronella major (Hincks) 1884 



Plate 52, figs. 4-5 



Mucronella spinosissima form major Hincks, 1884:53. 

 Phylactella major, Canu and Bassler, 1923 :170. 

 IMucronella microstoma, O'Donoghue, 1923 :46. 

 IMucronella simplicissima van perforata O'Donoghue, 1923:46. 



Zoarium encrusting on stones, shells and stems, forming white 

 irregular colonies. The zooecia are moderately large, 0.60 to 0.75 mm 

 long by 0.40 to 0.50 mm wide, varying greatly in proportions, sometimes 

 nearly as broad as long and again elongate and lageniform, apparently 

 in response to the substratum; very distinct and separated by deep 

 grooves. The ventricose front is a smooth pleurocyst with 2 or 3 rows 

 of small marginal pores; as the pleurocyst develops inward from the 

 margin the pores are carried along as microscopic tubules as far as to 

 the middle of the front and even up along the sides of the peristome and 

 over the top of the ovicell. When the process of calcification is com- 

 plete the front and the ovicell have the appearance of a tremocyst. 

 Hincks described these as "slender tubes immersed in the cell wall" ; 

 they are very clear in the younger zooecia but may be completely ob- 



