502 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Holoporella quadrispinosa Canu and Bassler, 1930 

 Plate 55, fig. 12 



Holoporella quadrispinosa Canu and Bassler, 1930:37. 



Zoarium encrusting. Marginal zooecia distinct, separated by deep 

 furrows, elongated, elliptical; the frontal convex, granulated, sometimes 

 with areolar pores and a small elongated avicularium with pivot. The 

 peristome salient, thin, with 4 spines ; the aperture semielliptic. There is 

 a small suboral avicularium with a triangular mandible directed upward 

 on the side of a small pointed rostrum. The cumulate zooecia are 

 irregular, granulated, with small elliptical avicularia. The interzooecial 

 avicularia are narrow, little elongated, with a pivot. The ovicell is 

 globose, widely open, the surface much granulated. (After Canu and 

 Bassler.) 



Described from the Galapagos Islands, Albatross stations 2813 and 

 2815. 



One colony in the Hancock collections appears to agree perfectly 

 with the above description, except that the ovicell is wanting. 



Hancock Station 299, San Jose del Cabo at the southern tip of 

 Lower California, 22°56M6"N, 109°47'15"W, at 82 fms. 



Genus TREMATOOEGIA Osburn, 1940 



Zoarium encrusting, in older stages often with superimposed layers. 

 Zooecia erect, appearing to stand on end, large and extremely thick- 

 walled. Peristome thick and slightly raised, usually with strong tubercles 

 or spinous processes which sometimes bear minute avicularia. Aperture 

 semicircular or bell-shaped, the proximal border slightly arcuate ; strong, 

 pointed cardelles. A suboral avicularium is sometimes present. The 

 ooecium is roughly hemispherical, not widely open as in Holoporella, 

 opening into the peristome and not closed by the operculum ; heavily 

 and roughly calcified, but with an uncalcified area or large pore on its 

 frontal surface. Frontal avicularia are present, small and rounded or 

 larger and spatulate. The operculum has the lateral sclerites extended 

 downward to form a thick lappet on each side a little distal to the 

 hinge. Genotype, Lepralia turrita Smitt, 1873. 



The writer has had the privilege of studying four species in addition 

 to the genotype ; Discopora pertusa Smitt, Holoporella porosa and 

 H. hexagonalis Canu and Bassler and T. protecta Osburn. These agree 

 in essential characters; perfectly erect zooecia with heavy calcification, 



