VI 



to 114, 75 of which are to be described as new species. They belong to 18 different genera, 

 two of which are introduced to science as new. They can be arranged in the following way : 



Here follows a list of all the species collected, arranged according to the depth at 

 which they were found to occur : 



NAME OF SPECIES 



Depth at which collected 



Lcpas anserifcra Linn 



Lepas fascicularis Eli. & Soll 



Balanus tintinnabulum Linn. var. validus Darw. . 

 Balanus tintinnabulum Linn. var. costatus n. var. 

 Balanus tintinnabulum Linn. var. plicatus n. var. | 



Alepas lithotryae n. sp 



Ibla Cumingi Darwin 



Ibla sibogae n. sp , 



Pollicipes mitella Linn , 



Lithotrya conica n. sp 



Floating objects, keel of H.M.S. "Siboga", etc. 

 Floating objects. 



Keel of H. M. S. 



'Siboga". 



Reef-exploration. 



Reef- and shore-exploration. 



Shore-exploration. 



Shore-exploration. 



Reef-exploration. 



' The present report contains the description of a third (a second new) species of Acasta which was also collected of late in 

 the Malay Archipelago. but which was not represented in the Siboga collection. 



