RE -CLASSIFICATION OF MULLERIA AND HOLOTHURTA. 169 



Sub-genus Actinopyoa.* Bromi. 



(= Actino'pyga, Bronn, 1860, partim ; Mulhria, 

 Jager, 1833, partim.) 



Generally twenty tentacles, but occasionally more. Ambu- 

 lacral appendages, papillse on the bivium and pedicels on the 

 trivium, the former being scattered and the latter being usually 

 arranged in three more or less distinct rows. Anal teeth 

 present. Calcareous ring has well-marked bevelled ampuUary 

 notches, and the anterior border has no deep indentations 

 between the radials and inter-radials. The radials extend 

 almost as far forward as the inter-radials. Spicules small, 

 generally taking the form of dichotomously branched rods or 

 spinous rods, or both. Tables and " buttons " never present. 



Eight species : — 



Actino'pyga agassizi (Selenka), Actinopyga echinites (Jilger), 

 Actinopyga formosa (Selenka), Actino-pyga lecanora 

 (Jager), Actinopyga mauritiania (Quoy & 

 Gaimard), Actinopyga miliaris (Quoy & Gaimard), 

 Actinopyga obesa (Selenka), Actinopyga serratidens, 

 (Pearson) . 



Sub-genus BoHADSCHiA.f Jager. 



(= Bohadschia, Jager, 1833 ; Holothuria, Linn, 

 partim; Sporadipus, Brandt, 1835, partim.) 



Twenty tentacles. Ambulacral appendages, pedicels, and 

 papillse. The trivium bears pedicels only, which are generally 

 scattered, but which may be arranged in three rows. The 

 bivium may bear either papillse only, or papillae mixed with 

 pedicels (? or pedicels only). Anus surrounded by five groups 

 of papillai and in the contracted condition generally pentagonal 

 in shape. Anal teeth absent. The calcareous ring closely 



* This sub-genus is almost identical with Bronn's genus Actinopyga. 

 I therefore retain this name. 



t The sub-genus which I now estabUsh for H. marmorata and the 

 related forms is practically identical with Jiiger's Bohadschia. I there- 

 fore propose re-establishing this name, which has long been discarded. 



