670 EXPLANATION OF THE PLATES. 



Serpulid or Yermetus-shull, and forms several roots.] Re- 

 duced to one third nat. size. 



Fig. L. Iotroclwta purpurea. A small but symmetrically developed 

 dry specimen from Torres Straits or its neighbourhood. 

 Nat. size. 



M. I. bacidifera. Portion of type (spirit) specimen on stone, 

 from Port Darwin, between tide-marks. Nat. size. [The 

 small pointed conuli are not quite so well marked on 

 this as on the reverse sido of tho specimen.] 



N. Schmidtia variabilis. The greater part of the type speci- 

 men (spirit), from Port Darwin, 7-12 fms. [Seen from 

 the side, the true base is towards the right-hand margin of 

 the plate.] Reduced to two thirds nat. size. 



0. Pdlina aliformis. The type specimen (inspirit), from Port 

 Darwin, 7-12 fms. Seen from one side, one wing almost 

 concealing the other. Nat. size. 



Plate XL. 



Fig. A. Echinodictyum glomeratum. Type specimen (dry), from 

 Thursday Island, Torres Straits, 4-5 fms. Nat. size. 



P. PacTiychalina macrodactj/la, portion, including the second 

 and third bifurcations above base, seen from the front. B'. 

 Apex of branch from front, slightly inclined to one side 

 to show lateral series of vents. From dry, somewhat 

 macerated, specimen from Friday Island, Torres Straits. 

 Nat. size. 



C. Ampldlectus Mspidulus. The greater part of the type (dry) 



specimen; the real base is on a shell (omitted) to the left. 

 From Thursday Island, Torres Straits, 3-5 fms. Nat. 

 size. 



D. Eeliinodictyum cancellatum. The lower part (about half of 



the whole) of tho type (dry and macerated) specimen 

 from Warrior Reef, Torres Straits. One third nat. size. 



