ACTIXOPODOCS HOLOTHURIOIDEA. 203 



Dcscriplion : — " This species is very closely allied to T. 

 antarcticum Thkel. liCngth 90 mm. Body cylindrical nnd nar- 

 rowed behind into a tail-like extremity. Skin rough but thin. In 

 spirit the ground coloiu" has become greenish-grey and the spots 

 are more or less blood-red. The tentacles fifteen in number, are 

 yellow and between every two there is, near the base, a blue- 

 black triangular mark. Each tentacle has three very small digits 

 at the free end. Mouth and anus terminal, the latter without 

 teetli, but in one specimen, with numerous fine papiUae. One 

 Polian vesicle, one free stone-canal ; 2 (3 ■') lungs, not much 

 branched ; one bundle of yellow genital tubes. The radii of the 

 calcareous ring are produced backwards as spines. Calcareous 

 bodies not very numerous consisting of a few wide-holed plates 

 and tower-like rods which are perforated with 4 to G holes. 

 Under the microscope the ' chocolate spots ' are seen to be com- 

 posed of rust-red ovoid bodies with a concentric arrangement. 

 They are insolulile in caustic potash. Colour when fresh ' dirty 

 flesh-colour with closely placed deep chocolate spots ; the cro^vn 

 (tentacles) being a sort of raw-moat-colour.' " (Walsh p. 204). 



Eemarhs : — The two specimens at my disix)sal are somewhat 

 different in their external appearance. The appearance of the first 

 specimen is given in figs. 64—65, PI. VII, It is greenish-yellow 

 all over the body, green predominating towards the posterior end. 

 The second specimen has much less color. It is greenish-yellow 

 only near the anterior end, the remaining portions being in most 

 parts nearly colorkiss and transhieent, changing into almost 

 wliitc in the tail. The skin in both is thin ; in the first specimen 

 it is rough to the touch, but in the second specimen it is much 

 softer. The measurements are as follows. No. 1672: 8.0 cm. 

 in len"th, 2.1cm. in diameter, tail short and only 1 em. long; 



