54 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Hancock Stations: 143-34, Wenman, 155-34, Albemarle, and 170-34, 

 Chatham Islands, Galapagos; 212-34, La Plata, and 12-33, La Libertad, 

 Ecuador; 411-35, Gorgona Island, Colombia; 298-34, Clarion Island, 

 west of Mexico; 276-34, Tenacatita Bay, Mexico; 283-34 and 286-34, 

 Thurloe Head, west cost of Lower California; 591-36, Puerto Escon- 

 dido, 659-37, Agua Verde Bay, and 1088, Ensenada de San Francisco, 

 Gulf of California; from shore to more than 100 fms. 



Antropora tincta (Hastings), 1930 

 Plate 4, fig. 7; plate 29, figs. 7 and 8 



Crassimar ginatella tincta Hastings, 1930 :708. 

 Membranipora lacroixii Robertson, 1908 :261, (in part) . 



The zoarium encrusts shells especially and on dead gastropod shells 

 inhabited by hermit crabs it sometimes develops erect irregular branches 

 as much as 50 mm in height ; multilaminar to a high degree ; color rang- 

 ing from white in younger stages through light pink to pinkish-brown. 

 The zooecia are irregularly oval, with one or two triangular or some- 

 what rounded areas at the proximal end of each zooecium (vestigial 

 avicularia), the appearance being similar to that of Conopeum (lacroixii) 

 reticulum. The areas, however, are not developed on the gymnocyst, as 

 dissection shows a tube descending to the dorsal side. Small functional 

 interzooecial avicularia are scattered irregularly among the zooecia in a 

 similar position, or replacing a zooecium at the beginning of a series; 

 they are often wanting over large areas, or there may be several of them 

 in the field of the microscope at once. There are no spines and the ovi- 

 cells are endozooecial. The mural rim is thin, but the rather heavy de- 

 scending cryptocyst is granular and there may be a narrow horizontal 

 shelf which sometimes develops minute denticles on its margin. The 

 avicularian mandible is semicircular or somewhat triangular in form with 

 a rounded tip; there is no pivotal bar, but well-marked hinge denticles 

 are present. Because of the endozooecial ovicell this species cannot re- 

 main in Crassimarginatella, and it has the appearance of a species of 

 Antropora with somewhat larger and less pointed avicularia. 



Described by Hastings from Balboa, Canal Zone, from the Galapagos 

 Islands, and also recorded from Mazatlan, Mexico, in the Busk collection. 



Hancock Stations: Occurring in 47 of the Hancock dredging stations 

 from Point Conception, California, to Peru and the Galapagos Islands, 

 at depths from 2 to 78 fms. 



