318 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 11 



before (Deichmann, 1938, p. 368; Cherbonnier, 1951, p. 21). The 

 Holothuria glaberrima s from the same region are identical with Selenk- 

 othuria erinaceus (Semper), as Panning's fig. 42 distinctly shows. 



Selenkothuria theeli (Deichmann) 

 PI. 7, figs. 1-9 



Holothuria marenzelleri var. ? Theel, 1886a, p. 8. 



Holothuria marenzelleri Ludwig, 1887, p. 2, pi. 2, fig. 12 A-E. 



Non Holothuria marenzelleri Ludwig, 1883, p. 167 {H. erinaceus 



Semper). 

 Holothuria marenzelleri Ludwig, var. theeli Deichmann (partim), 

 1938, p. 369, fig. 5. 



Diagnosis: Large robust form with up to 20 bushy tentacles, often 

 of unequal size, numerous cylindrical feet on the ventrum and slightly 

 fewer small papillae and tube feet on the dorsum. Single free stone canal 

 with elongate head, and one or more Polian vesicles. 



Spicules short, forked rods often forming four-holed plates; larger 

 irregular plates with a greater number of holes; margin of plates often 

 with blunt teeth. Feet with large end plate and short curved rods with 

 few holes in the ends; often one end better developed than the other; 

 dorsal feet with or without a remnant of an end plate and also with 

 short rods or plates. 



Color dull reddish-brown. 



Type: Museum of Comparative Zoology. 



Type locality : Charles Island, Galapagos Islands. 



Distribution: Common in the Galapagos Islands where Theel's 

 material came from, as well as that from the Arcturus expeditions. The 

 Velero HI reports it from 34 stations with a total of 157 specimens. In 

 addition, the Hancock expeditions brought it back from Zorritos, Peru, 

 La Libertad, Ecuador, Cocos Island, and Ensenada, San Francisco, in 

 Sonora, in the upper part of the Gulf of California (27° N). There 

 are no records from Socorro and Clarion Islands, nor from the west 

 coast of Lower California. 



Depth: Shore. From Sta 778-38, the species is reported from 30 to 

 50 fathoms (?). 



Remarks: Theel realized with his usual astuteness that the Gala- 

 pagos material differed from Ludwig's type material of Holothuria 

 marenzelleri from Nankauri, and his description of the spicules agrees 

 completely with the figures Ludwig later drew of his material from the 

 Galapagos Islands. Deichmann, in 1938, established H. m. var. theeli 



