NO. 2 DEICHMANN : HOLOTHURIOIDEA ; PART II, ASPIDOCHIROTA 315 



Key to the members of the genus Selenkothuria 



1. Spicules as rods, usually with finely spinulated surface; mostly 

 simple with a small hole in each end, rarely with a series of 

 lateral projections sometimes forming a series of holes. Stone 

 canals numerous. From Mauritius to southern Japan. Type 

 locality: Hong Kong, China. . . . moebi (Ludwig) 



1. Spicules as rods or plates, smooth to dentate; if finely dentate 

 surface, then numerous holes along the edges. Stone canal 

 single, or rarely two 2 



2. Spicules as rods 3 



2. Spicules as plates 5 



3. Rods short, straight, with few stout spines; rarely a few 

 branching or curved. Cape of Good Hope to Gulf of Persia. 

 Type locality: Natal, South Africa. . . parva Lampert 



3. Rods mostly curved 4 



4. Spicules delicate curved rods with indistinct spines and mostly 

 a small hole in each end. Brown to almost black. West Indian 



waters. Type locality: Haiti, W. I 



glaberrima (Selenka) 



4. Spicules curved rods, rarely with perforated ends (in the tube 

 feet), and strongly to moderately spinous surface. Color vary- 

 ing from grayish, with or without two rows of black spots on 

 the back, to black, with sulphur-colored disks on ventral feet. 

 Panamic region, including the Galapagos Islands. Type local- 

 ity: Acapulco, Mexico lubrica (Selenka) 



5. Spicules plates and broad bars, often curved, with numerous 

 marginal or terminal holes; surface of the margin often spin- 

 ous. Galapagos to west coast of Mexico. Type locality: Puerto 

 Vallarte, Mexico portovallartensis (Caso) 



5. Spicules smooth, perforated plates or broad rods with a few 

 holes along the margin of the deposits 6 



6. Spicules predominately plates or short rods with usually few 

 holes and more or less dentate margin. Galapagos Islands and a 

 few localities along the tropical shores of America. Type local- 

 ity: Galapagos Islands theeli Deichmann 



6. Spicules predominately short flat rods, often with forked ends 

 and few lateral or terminal holes. Nicobars, East Indies, in- 

 cluding the Philippines. Type locality: Bohol, Philippines (and 



Nicobars) 



erinaceus (Semper) {=Holothuria marenzelleri Ludwig) 



