460 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Secondary calcification masks the primary characters to produce a 

 very different picture; the front becomes irregularly roughened and 

 nodular and the short costal ridges heavier, the peristome projects for- 

 w^ard above the aperture and almost completely covers it, and the ovicell 

 becomes deeply submerged. 



The ovicell is at first nearly globular, 0.26 mm vv^ide, with a large 

 semicircular frontal area which shows delicate radiating lines and a 

 trace of a broad and very short labellum. 



Hancock Stations: 1234 and 1067, San Miguel Island, 55 fms; 

 1232-41, off San Pedro Breakwater, 18 fms; 1271-41 and 1938-50, 

 Anacapa Island, and 1896-49, Tanner Bank, off San Diego, 23 to 35 

 fms, southern California; 1250-41, San Benito Islands, 66 fms, and 

 1258-41, Natividad Island, 63 fms, off Point San Eugenio, Lower 

 California. The known range is from about 34° to 28° N Lat. and 

 the bathymetric range from 18 to 66 fms. The species was described by 

 Canu and Bassler from the Pleistocene of Santa Monica, southern 

 California. 



Rhynchozoon spicatum new species 

 Plate 55, figs. 1-3 and Plate 54, fig. 10 



Zoarium encrusting on various objects, often multilaminar. Zooecia 

 closely set in quincunx, marginal ones distinct with deep separating 

 grooves, length 0.40 to 0.50 mm, width 0.30 to 0.35 mm. The front 

 of the younger zooecia is ventricose, smooth on the top, with a row of 

 small marginal pores between which low costate ridges extend for a 

 short distance. Distally the front is strongly elevated and ends in a 

 high pointed or rounded umbonate process proximal to the aperture, the 

 small suboral avicularium hidden at its base. The umbonate process 

 may be as much as 0.50 mm high and pointed, but usually has the form 

 of a short, stout column with a rounded tip ; as they appear on nearly 

 all of the zooecia, they give the surface a "hobnailed" appearance. The 

 primary aperture is nearly round, 0.12 mm in diameter, with a broad 

 shallow sinus, and the vestibular arch is strongly beaded. The suboral 

 avicularium is small, the pointed mandible only 0.06 to 0.08 mm long, 

 directed laterally and can be observed only by turning the specimen 

 so as to look into the aperture. The frontal avicularia are larger, 

 elevated on a broad base, the mandible elongate triangular (0.10 to 

 0.12 mm long), and abundant on the older areas of the zoarium. There 

 are two long, slender oral spines. 



