190 DR. J. PEARSON ON MARINE FAUNA [Feb. 1, 



One specimen from Moscos Islands. 

 Length 60 mm. ; breadth 9 mm. 

 Two specimens from Station XVIII. W. & S.W. of Page Is. 



Length 105 mm. 106 mm. 



Breadth 16 „ 12 „ 



The general features of this species have been fully described 

 by previous investigators. The hard integument due to the 

 closely-packed spicules is characteristic of this species. 



In the Ceylon Report I described plate-like spicules in addition 

 to the deposits described by Theel and figured by Bell. A more 

 detailed examination proves that these additional spicules have 

 not the simple structure indicated by me in the Ceylon Report. 

 In that report I described them as " plates having more than 

 four holes and having short spines on the surface." That is the 

 appearance presented from above, but in side view it is seen that 

 from the centre of the large plate there arises an irregular 

 massive superstructure which bears numerous spines (text- 

 fig. 20 A). 



Diameter of the large spinous tables ... 110 p. 



Length of the buttons 74 ju . 



In the calcareous ring both the radials and inter-radials have 

 short anterior processes which are notched in front. The radials 

 have posterior bifurcations. Both the radials and inter-radials 

 appear to be composed of numerous small pieces, the arrangement 

 of which is not easily determined (text-fig. 20 B). 



General distribution. Bohol, Japan, Torres Str., Aden, Zanzibar, 

 Mozambique, Mergui, Java, Kurachee, Ceylon. 



AcTiNOCueuMis typica Ludwig. 



Actinocucumis typica Ludwig, 1875 (8). 

 ? Actinocucumis clifficilis Bell, 1884 (12). 

 Actinocucumis typica Lampert, 1885 (13); Theel, 1886 (15); 

 Ludwig, 1891 (19). 



One specimen from Station XXV. Gregory Group. 



Length 55 mm. ; breadth 9 mm. 

 There is nothing to add to previous descriptions of the external 

 appearance. 



The calcareous ring has no posterior prolongations (text- 

 fig. 21 A). 



In addition to the small peculiar spicules, described by Theel 

 as being " acorn-shaped," and which are very numerous, there are 

 present delicate perforated plates which appear not to have been 

 noticed hitherto. This is probably due to their being almost 

 completely hidden by the other deposits (text- fig. 21 B). 

 Length of the " acorn-shaped " bodies ... 40 fj. 

 Length of perforated plates 40 ^ . 



General distribution. Bowen, Amoy, Albany Is., Torres Str., 

 Kurachee. 



