NO. 2 DEICHMANN : HOLOTHURIOIDEA ; PART II, ASPIDOCHIROTA 291 



that Semper later called Holothuria arenicola (see Fisher, 1907, p. 

 662). 



All three species occur in the Panamic region, but while two of them 

 are extremely common and also occur in the West Indies, the third, 

 with only a few scattered locality records, appears to be a visitor from 

 Hawaii or some other outlying West Pacific island group. 



Key to the species of the genus Brandtothuria 



1. Tables stout, with about 8 marginal holes in the almost squar- 

 ish disk; spire low, squat, with numerous short spines on the 

 top. Buttons regular with six large holes. Color mottled gray 

 to reddish brown; skin rough to the touch, animals usually 



strongly warted. Almost circumtropical 



impatiens (Forskal) 



1. Tables not remarkably stout; disk circular or with four mar- 

 ginal holes ; spire more or less tapering, with a varying number 



of spines 2 



2. Disk of tables normally circular with several small holes. But- 

 tons delicate, elongate, with six large, narrow holes. Color 

 golden brown with a circular pale area around the appendages, 

 which may be dark brown. Ranges from East Africa to the 

 west coast of tropical America. . . . gyrifer (Selenka) 



2. Disk of tables often reduced to the central four holes. Buttons 

 small with six small holes, often partly obliterated ventrally. 

 Color whitish gray to light brown, often with two rows of 

 black spots on the back, or small black specks scattered all over 

 the animal. Rusty red or black specimens may be found, stained 

 by the mud in which they live. Almost circumtropical. 

 arenicola (Semper) 



Brandtothuria arenicola (Semper) 

 PI. 1, figs. 10-13 



Holothuria arenicola Semper, 1868, p. 81, pi. 20; pi. 30, fig. 13; pi. 

 35, fig. 4. Panning, 1935, IV, p. 88-89, fig. 73, almost complete 

 list of references. Deichmann, 1938, p. 364. Steinbeck & 

 Ricketts, 1941, p. 407. 



Holothuria monsuni Heding, 1939, pp. 217-218, figs. 18-26. 



Diagnosis: Slender spindle-shaped form, up to 20 cm long, mostly 



about 10 to 16 cm in length. Feet scattered in indistinct bands, ventrallv 



