i8o 



"ENDEAVOUR" SCIENTIFIC RESULTS. 



by Lendenfeld, will serve as an example of the sponge in its 

 more (secondarily attained) lamelliform condition ; w hilst the 

 one shown herein (Plate xxv., fig. i) represents a condition in- 

 termediate between the preceding and that which is exhibited 

 by the most ramose examples of the variety. The former speci- 

 men, it should be mentioned, is somewhat abnormal on 

 account of its rugged surface, and the number of digitiform 



Fig 36 — Rhaphidophlus paucispitms. a Principal styli. b, b' 

 Auxiliary styli. c Special dermal styli. c' Styli intermediate 

 between the auxiliary and dermal. 



processes which aiise from both its sides. Though some of 

 these processes are probabl\ of ad\entitious origin, others 

 appear to be branches which ha\e deviated from the plane 

 of growth and so become excluded from participation in the 

 formation of the main body. The maximum of sub-division 

 into separate parts amongst the present specimens is shown 

 by the specimen figured in Plate xxvi. ; in this case the primary 

 lamella has broken up into a number of sub-lamellae, which 

 come to lie in overlapping planes. The sponge, even in those 

 rare cases in which a stalk is formed, is usually attached by a 

 broad, often spreading disk, from which additional upgrowths 



