REPORT ON THE MONAXONIDA. 55 



with moderately thick walls ; it has been broken off at the bottom, so that the nature of 

 the base cannot be determined. Height 72 mm. ; greatest breadth across the mouth 

 about 50 mm.; thickness of walls about G mm., thinning towards the lip. Colour in 

 spirit pale yellow. Texture soft and very fragile. Surface (the specimen is so much 

 washed that it is difficult to determine the true nature of the surface, but it seems to 

 have been fairly smooth both inside and out). Dermal memhrane ; for the most part 

 washed off; thin and transparent. Oscula small, scattered over the inside of the cup 

 (? only). Pores ? 



Skeleton. — A very loose, slightly fibrous reticulation of rather slender stylote 

 spicules, with bicapitate cylindricals (tylota) rather sparingly arranged at the surface, 

 in irreo-ular tufts or scattered. 



Spicules. — (a) Megasclera ; (1) slightly curved or straight, slender, smooth styli 

 (PL XXIX. fig. 2), sharply and rather suddenly pointed at the apex; size about 0"54 by 

 0"015 mm.; (2) slender, smooth, straight tylota (PL XXIX. fig. 2a), much smaller than 

 the styli, with well-developed oval heads often somewhat pointed at the ends, and 

 (?) with slight traces of minute spination. Size about 0"28 by 0"0063 mm. (b) Micro- 

 sclera ; very abundant, long, hair-like rhaphides, very slender, and scattered through 

 the tissues like hair in plaster ; occurring both separately and in loose bundles ; size 

 about 0-35 by 0-002 mm. 



Had not this species differed somewhat in spiculation, as well as in external form, 

 from those previously described, we should scarcely have ventured to describe it as new ; 

 unfortunately tLere is only a single specimen in the collection ; as regards spiculation 

 the most characteristic feature is the form of the bicapitate cylindricals (tylota) 

 (PL XXIX. fig. 2a) ; the rhaphides are remarkably large, though not coming up to 

 those of Tedania massa. 



Locality. — Off the south-west coast of Patagonia. One specimen. 



Tedania actiniiformis, Ridley and Dendy (PL XL figs. 2, 2a; PL XXIX. figs. 1, la). 



1886. Tedania actiniiformis, Ridley and Dendy, Ann. and Mag. Nat. Hist., ser. 5, vol. xviii. 



p. 336. 



Sponge (PL XL fig. 2) sessile, cylindrical, shape like that of a sea-anemone (whence 

 the specific name) attached by a narrowed base to a fragment of stone; abruptly and 

 flatly truncated above so as to give rise to a broad oval plateau which bears four or five 

 small oscular tubes. On the side of the sponge at a distance of about 2 mm. below the 

 top is a circular zone of pores, about 2 mm. in breadth, running round the sponge 

 (vide fig.). Height of sponge 18 mm.; greatest diameter at top 29 mm., at base 18 

 mm. Colour in spirit greyish-brown. Texture soft and spongj^ (the specimen is in bad 

 condition). Surface rather uneven. Dermal membrane thin and transparent. Oscula 



