Echhiodermata, hy Prof. F. J. Bell. 445 



Holothuria aspera. (PL XVIII. fig. 3.) 



Although there is but a single specimen of what I think is 

 certainly a new species of Holothuria, the spicules appear to 

 be so characteristic that there is no harm in giving a name 

 to a form of which we shall, I hope, soon obtain a supply 

 large enough to enable me to give a complete account of its 

 special points. 



This single specimen is a good deal contracted and the 

 tentacles are all withdrawn. The skin has to the touch a 

 peculiar roughness, which is no doubt due to the very dense 

 deposit of spicules in it. Above, the skin is wrinkled, below 

 it is smooth : on each side there is a single row of not closely 

 ))acked pedicels ; no other processes are to be detected. The 

 colour of the skin is a dirty grey. The length of the body is 

 77 millim. and the greatest breadth 46. 



The spicules are particularly difficult to isolate ; their 

 general form is well shown in fig. 3, PI, XVIII. 



The processes or arms may touch or overlie one another. 

 As there is only one specimen I have not dissected it. 



It was dredo-ed at 1000 fath. 



EXPLANATION OF THE PLATES. 



Plate XVIII. 



Fig. 1. Pliorinosoma placenta laid open, so as to show the lantern and the 

 ] arts adjacent thereto. It will be noticed that the organs of 

 Stewart are altogether wanting. Natural size. 



Fig. 2. The same, opened as before, s in three radii points to small pro- 

 jecting cajca, two of ^^hich are cjuite small and the third hardly 

 more than a papilla. Natural size. 



Fig. 3. Calcareous spicules from the skin of Holothuria aspera. x 220. 



Plate XIX. 



Fig. 1. Echinus microstoma. The specimen from which this figure was 

 taken agrees in all essential characters with one which is referred 

 to the same species by the Rev. Dr. Norman and which was 

 collected by the ' Porcupine.' Natural size. 



Fig. 2. Echinus elegans, snaall specimen. X 2. 



Fig. 3. C-shaped spicule of Echinus elegans. X 220. 



F%g. 4. Astrvgonium Greeni, seen from above. X f . 



