370 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



times rounded) mandible opposite the sinus or a little proximal to it; 

 these usually lie at the bottom of the circumoral depression, but may be 

 more or less fused with the thick frontal. A larger avicularium occupies 

 much of the frontal surface, its chamber elevated, the mandible variously 

 directed and with a strong hinge bar. 



The ovicell is about 0.18 mm wide, globular, not closed by the 

 operculum, imperforate, very prominent at first but later immersed more 

 or less in the thick frontal of the distal zooecium which leaves in view 

 only a radiately grooved rounded area on the top. 



This species resembles a miniature 5. h'laperta, but is much smaller 

 in all measurements, the sinus narrower and more definitely v-shaped 

 and the anter less transverse. 



Type, AHF no. 77. 



Type locality, Hancock Station 1388-41, ofiF East Point of Santa 

 Rosa Island, southern California, 33°54'30"N, 119°54'28''W, at 54 

 fms. Also at stations 1387-41, of! Santa Rosa Island, 52 fms; 1067, 

 N.E. of Santa Barbara Island, 83 fms, southern California; 1241 and 

 2160, S. of San Benito Islands, W. of Lower California, 44 fms; 2131, 

 N. of Isla Partida, Gulf of California, 75 fms, and 438, Chatham 

 Island, Galapagos. Other specimens in collection are from Banderas 

 Bay, W. Mexico (about 21°30'N), and from Middle Bank, Puget 

 Sound, Washington (about 48°30'N), Dr. J. L. Mohr, collector. 

 The Pleistocene of Santa Barbara, California, also yielded a number of 

 specimens, collected by Mr. J. D. Soule. 



Stephanosella bolini new species 

 Plate 42, figs. 3-5 



Zoarium encrusting the rough surfaces of pebbles, white and por- 

 cellanous. Zooecia large, 0.70 to 0.90 mm long to 0.50 to 0.65 mm 

 wide, very irregular in size, form and orientation; distinct in younger 

 stages, little inflated. The frontal is a very thick olocyst with large 

 areolar pores and a varying number of smaller ones irregularly dis- 

 tributed over the proximal part of the front; the appearance is some- 

 times very much like a tremocyst but there is no secondary frontal layer 

 and the pores are always absent from an area proximal to the aperture. 

 The surface is more or less irregular in older zooecia but there are no 

 umbonate processes. 



The aperture is rounded back to the cardelles, and proximal to these 

 has a shallow, broad, u-shaped sinus; about 0.17 mm in either dimension; 

 the peristome is low and smooth, without spines and is usually obscured 



