16 ALLAN HANCOCK ATLANTIC EXPEDITION REPORT 



Genus EXEGHONELLA Canu and Bassler 1927 

 Exechonella antillea spinosa Osburn, 1940 

 Osburn 1940:367. 



The tall unjointed spinous processes arise from the frontal pericyst 

 between the pores and similar, but shorter and smaller spines are often 

 present on the peristome. It was recorded by Osburn from Jamaica and 

 Bermuda. 



Distribution. — Station A52-39, Caledonia Bay, Panama at 5 fms. 



Genus TREMOGASTERINA Canu 1911 

 A heavy pericyst covers the frontal membrane with the exception of 

 one to three large central pores and beneath this the frontal membrane 

 functions in the usual anascan fashion. At first glance the species appear 

 to belong to the Ascophora. 



Tremogasterina granulata Canu and Bassler, 1928 

 Canu and Bassler 1928:45. 



The avicularium is long and narrowly pointed. The lack of oral 

 spines separates it from T. lanceolata C. and B., and the absence of a 

 suboral umbo differentiates it from T. mucronata (Smitt). Recorded 

 by Canu and Bassler from the Gulf of Mexico and the Florida Straits. 



Distribution. — Station At504, 1 mile off Aruba Island at 71 fms. 



Tremogasterina mucronata (Smitt), 1873 

 Smitt 1873:24 (Escharipora ? mucronata). 



This species is similar to T. granulata C. and B., except that there 

 is a small but very definite umbo behind the aperture. It may grade into 

 granulata. Apparently it has not been observed since Smitt described it 

 from Pourtales' dredgings west of the Tortugas Islands, Florida. 



Distribution. — Stations At525 and At529, the Gulf of Venezuela 

 at 39 fms, several colonies. 



Tremogasterina malleolus Canu and Bassler, 1928 

 Canu and Bassler 1928:48. 



The avicularium is broadened and truncated at the tip and there is 

 a very salient umbonate process which is enlarged at the tip to form a 

 hammer-shaped process. 



Recorded by Canu and Bassler from the Gulf of Mexico and from 

 the Caribbean Sea east of Jamaica. 



Distribution.— 'it^non At529, 12° 09' 30" N, 70° 31' 00" W at 

 39 fms, several small colonies. 



