52 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



dissections of both fossil and recent types of Dacryonella (D. octonaria 

 Canu and Bassler, D. typica Canu and Bassler and D. trapezoides Canu 

 and Bassler), all of which show the fundamental characters of Antro- 

 pora. Marcus (1937:50) placed Dacryonella minor (Hincks) under 

 Membrendoecium; Osburn (1940:358) placed Dacryonello typica Canu 

 and Bassler in Canua (Membrendoecium), and Silen (1941:43) comes 

 to the conclusion that Membrendoecium "cannot be kept apart from 

 Antropora." 



Key TO THE Species of Antropora 



1. Avicularium with a triangular mandible 2 



Avicularium with a semicircular or very slightly triangular 



mandible, small but varying greatly in size, not regularly 

 oriented, usually minute and vestigial tincta 



2. Avicularia with a triangular mandible, usually paired and di- 



rected forward, frequently vestigial and often wanting on 



one or both sides claustracrassa 



Avicularia with acute triangular mandible, usually paired and 

 directed toward each other across the proximal end of the 

 zooecium, occasionally vestigial or wanting. . . . granulifera 



Antropora granulifera (Hincks), 1880 

 Plate 4, fig. 5 

 Membranipora granulifera Hincks, 1880a:72. 

 Antropora granulifera, Norman, 1903:87. 

 Antropora granulifera, Harmer, 1926:232. 

 Antropora granulifera, Hastings, 1930:714. 



Zoarium encrusting. Zooecia variable in size, but usually from 0.35 

 to 0.40 mm long by 0.25 to 0.30 wide; outlined by a thin mural rim; 

 walls heavily calcified. Gymnocyst vestigial ; cryptocyst thick and coarsely 

 granulated, extending for about half the length of the zooecium and con- 

 tinued around the aperture; opesia subtriangular, its proximal border 

 straight or slightly arched, the sides contracted slightly opposite the 

 opercular attachment. The small avicularia vary somewhat, but char- 

 acteristically there is a pair immediately distal to each zooecium, the 

 mandibles sharply triangular, the rostra slightly elevated and directed 

 toward each other, their points frequently touching. Norman (p. 88) 

 describes them as "in the extreme upper part of the zooecium." Harmer 

 (p. 233) considers them to be "proximal avicularia belonging to the suc- 

 ceeding zooecium." However, they do not "belong" to either zooecium, 

 and dissection and development at the growing edge both show them 

 extending to the dorsal wall, and at the edge the young avicularian 



