EEPOET ON THE HOLOTHUEIOIDEA. 
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Colochirus doUolum {Actinia), Pallas, 1766; von Marenzeller, 1874. Holothuria 
Lamarck, 1816 {partini). Pentactes doliolum,H 2 dgQv, 1833 {partim). 
Cladodactyla doliolum, Brandt, 1835. 
Habitat . — Cape of Good Hope (PaUas). 
Genus 5. Aetinoeueumis, Ludwig, 1875. 
Tentacles eighteen to twenty, unequal and irregularly disposed, two ventral being 
always smallest. Ambulacral appendages — pedicels and papillae ; the former 
arranged in several (four to six) rows along each ambulacrum ; the latter, 
very small, scattered on the dorsal interambulacra and also among the pedicels 
on the dorsal ambulacra. 
Aetinoeueumis typica, Ludwig, 1875 . 
Deposits — very numerous, small, perforated acorn-shaped bodies. Calcareous ring 
composed of ten simple pieces without posterior prolongations. 
Habitat . — Bowen (Ludwig), Amoy (Ludwig). 
Aetinoeueumis difficilis, Bell, 1884. 
Habitat . — Albany Island, Torres Strait, Kurrachee (BeU). 
Bell says : — “ I have had the greatest difficulty in assuring myself of the specific 
distinctness of this form from the Aetinoeueumis typiea of Ludwig.” So far as 
I can judge, there exist no other differences between these two forms than in 
the shape of the deposits, these being in the species of Bell more simple, S-hke, 
with two holes and some knobs. Considering that even such deposits are not 
rare in the species of Ludwig, I am much inclined to refer them to one and 
the same species. Bell does not describe the calcareous ring. 
Genus 6. Pseudoeueumis, Ludwig, 1875. 
Tentacles twenty, ten larger and ten smaller, alternating two and two ; some of the 
smaller tentacles forming an inner crown. Ambulacral appendages in the shape 
of pedicels, arranged in rows along the ambulacra. Interambulacra naked. 
Calcareous ring composed of ten simple pieces without posterior prolongations. 
Pseudoeueumis acicula {Cucumaria), Semper, 1868; Ludwig, 1875 ; Schmeltz, 1879. 
Ventral ambulacra with three or four rov/s of pedicels, dorsal with only one or two. 
Deposits — peculiarly shaped needles, with holes at the obtusely rounded base. 
