518 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



to the large cardelles, proximal to which is a large deep poster (some- 

 what narrower than the anter) with an arcuate border. The operculum 

 is well chitinized with a bordering sclerite. The frontal avicularia 

 appear to be dependent, but their development at the growing border 

 shows them to be interzooecial as their chambers descend to the dorsal 

 side parallel to the zooecial cavities; avicularia are also scattered over 

 the dorsal surface. 



The ovicell is hyperstomial, deeply embedded so that only its frontal 

 surface is visible, and it is closed by the operculum ; it is developed 

 before the distal zooecium and the latter is modified to accommodate 

 it, as its cavity extends beneath the ovicell and later becomes erect. 



The species is fairly common in the Gulf of Mexico and Caribbean 

 Sea. On the Pacific coast it has been recorded by Hastings from Gorgona, 

 Colombia, and by Canu and Bassler from the Galapagos Islands. 



Hancock Stations: dredged at 42 stations, abundant about the Gala- 

 pagos Islands and in the Gulf of California south of the 29th parallel 

 (Angel de la Guardia Island). Also taken at Clarion Island, west of 

 Mexico; Cocos Island and Port Culebra, Costa Rica; Secas Islands, 

 Panama, and at Dewey Channel on the west coast of Lower California. 

 The known distribution in the Pacific is from about 29 °N Lat. 

 southward through the Galapagos Islands to a little south of the equator ; 

 the depth range is 10 to 55 fms. 



