112 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



the average length being about 0.30 mm, its tip is usually more rounded 

 than in gothica. The tip of the rostrum is complete, not notched, and 

 encloses the tip of the mandible. 



The spicules are all curved calipers; many specimens from different 

 localities have been examined and none of the straight compasses have 

 been observed. 



The ooecia are very conspicuous, large, bilobate, and prominent, 

 smooth or faintly striate on the surface, with a longitudinal keel ; the 

 fertile zooecia reduced somewhat in size. 



While this and the preceding species resemble each other closely in 

 general appearance, T. calif ornica is smaller, has an arcuate instead of 

 sinuate proximal opesial border, has only caliper-like spicules and lacks 

 a notch at the tip of the avicularian rostrum. The main sclerites of the 

 mandible are also slightly incurved instead of being straight as in gothica. 

 Hincks had the species from Santa Monica, California, and Robertson 

 listed it from San Pedro and San Diego, California; Levinsen studied 

 Hincks' material and Hastings recorded it from the Galapagos Islands. 



In the Hancock collections (24 stations) it ranges all the way from 

 the northern Channel Islands, California, southward to Gorgona, Co- 

 lombia, and the Galapagos Islands. I find no record of it from north of 

 Point Conception, California, but it is often excessively abundant from 

 there southward, especially in shallow water along shore, and continuing 

 down to 47 fms. The writer has also identified it in the Pleistocene of 

 Playa del Rey, California. 



Family Lunulariidae Levinsen, 1909 



Free, discoidal, saucer-shaped or conical zoaria ; zooecia with the cryp- 

 tocyst more or less developed, each zooecium preceded in the series by an 

 auriculate vibracular chamber with a long setose vibraculum. Ovicells 

 endozooecial or wanting. 



Genus DISCOPORELLA d'Orbigny, 1852 



The zoarium is free and discoid, convex on the frontal side, but vary- 

 ing indefinitely from cup to saucer-shaped, sometimes nearly flat, the 

 dorsal side concave or flat. The zooecia are ranged in radial rows, each 

 with a vibraculum at its distal end ; cryptocyst nearly complete except 

 for a number of opesiules on each side. The colonies resemble those of 

 Cupuladria but are distinguished at once by the presence of a cryptocyst. 

 Genotype, Lunulites umbellata Def ranee, 1823. 



