NO. 2 DEICHMANN : HOLOTHURIOIDEA ; PART II, ASPIDOCHIROTA 285 



9. Tables variously developed, but not with four slender col- 

 umns curving outward at the top 10 



10. Clumsy tables with low spire and margin of disk often den- 

 tate. Buttons regular to irregular, often twisted or incomplete. 

 Small cylindrical forms with small terminal tentacles. Under 

 rocks, {pardalis group) . . 4. Lessonothuria n. gen. 



10. More or less irregular tables, often with dentate margin and 

 a cluster of irregular sharp spines on top of the spire. Buttons 

 large, often irregular, becoming smaller and more regular 

 with age ; buttons lacking in one form. Large cylindrical body 

 with small ventral tentacles and a moderate number of ven- 

 tral feet, and still fewer papillae on the dorsum and along the 

 flanks. Usually with a pale area around the base of the mostly 

 darker appendages. In deeper water, 50 to 250 fathoms. 

 {lentiginosa group) ... 8. Vaneyothuria n. gen. 



11. Tables well developed, with knobby margin and spire often 

 transformed into a reticulated mass. Buttons regular, strong- 

 ly knobbed; longer on the ventrum and may here show a 

 tendency to become less knobby with age. Flattened forms 

 with small ventral tentacles and small feet and papillae. 

 (rigida group) . . . . 11. Fossothuria n. gen. 



11. Tables with tendency to become reduced, spire never forming 

 a large reticulated mass. Buttons irregular, often twisted or 

 incomplete, with or without irregularly scattered knobs. 12 



12. Stout forms with ventral tentacles and large ventral sole of 

 cylindrical feet, back covered by conical papillae. Calcareous 

 ring stout, of normal shape, {inhabilis group) .... 

 12. Jaegerothuria n. gen. 



12. Stout form with cylindrical body and small terminal tentacles. 

 Conical appendages dorsally and ventrally, on the ventrum 

 ending in a retractile cylindrical tube foot. Calcareous ring 

 with short posterior prolongations on the radials. (princeps 

 group) 13. Theelothuria n. gen. 



1. Labidodemas Selenka 1867 



Labidodemas Selenka, 1867, p. 309. 



Diagnosis: Medium-sized species, up to 15 cm long, with 20 small 

 tentacles terminally placed, anus subterminal. Feet few, in single to 

 double rows along the radii, rarely spreading out into the interambul- 



