THE SPONGES OF THE WEST-CENTRAL PACIFIC 131 



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Text Figure No. 82. Spicules of Tedandoryx lissa. A: Ectosomal tylote, X 182. B: 

 Endosomal style, X 182. C: Terminations of the tylote, X 781. The central portion is 

 not shown. D: Terminations of the style, X 781. The central portion is not shown. 

 E: Partially spined microstyle, X 781. F: Larger isochela, X 781. Side view and front 

 view are shown, but not of the same microsclere. Much variation in shape occurs. G: 

 Smaller isochela, X 781. Front and side views are shown. 



The surface is extremely irregular with no particular pattern. The 

 pores were closed by the time specimens reached the surface, and the only 

 indications of oscules are dubious. Perhaps the genuine oscules were closed. 



The ectosome comprises a tangent layer of special spicules, and the 

 endosome is chiefly confused, with some resemblance to crumb-of-bread or 

 microcavernous structure. 



The skeleton consists primarily of spicules with little or no spongin. 

 The ectosomal megascleres are tylotes, 3 p. by 240 n, with heads only slightly 

 larger than the shafts. The megascleres of the endosome are smooth sub- 

 tylostyles, again with heads only slightly larger than the diameter of the 

 shafts. Their dimensions are approximately 5 /x by 240 /x. The flesh is crowded 

 with microscleres which are faintly microspined, and strongly suggest those 

 characteristic of the genus Tedania, but these are not equi-ended — being 

 slightly larger at one end and blunt at that same end. Their dimensions are 

 approximately 1.5 /x by 120 /x. There also are present isochelas of peculiar 

 shape and two categories. A larger one is 25 fi in length, and a smaller one 

 10 fx to 11 /a in length. These are best described by an illustration, but it is 

 pertinent to comment that the central wing is very small and the lateral wings 

 at each end of the spicule are exaggerated and rather ear-shaped. 



Comparisons of this species, as for example to the genera Tedania and 

 Lissodendoryx, occur in the generic discussion above. 



The species name is derived from a Greek word for "smooth." 



