BENDY NON-CALCAREOUS SPONGES 97 



classification of the Non-Calcarea from the phylogenetic point of view in some 

 detail. 



My account of the six species of Calcareous Sponges collected by Mr. Hornell 

 has already been published [Dendy 1915]. 



1. Myriastra (Piloehrota) haeckeli Sollas. 



Pilochrota haeckeli Sollas [1888]. 

 Stelletta haeckeli Lendenfeld [1903]. 

 Pilochrota haeckeli Dendy [1905]. 



There are in the collection nineteen specimens which I refer to this species. 

 The smallest are approximately spherical and no larger than a pea. The largest 

 is irregular, like a potato ; measures about 45 mm. in length by 33 mm. in 

 transverse diameter, and has three vents. They closely resemble the specimens 

 collected by Professor Herdman at Ceylon, but the thin, membranous lip of the 

 vent appears to be devoid of oxeote spicules. 



The largest specimen (R.N. IV. 3) shows to a very marked degree the curious 

 abnormality of some of the trisenes which I described and figured in the case 

 of the Ceylon material. The reduction of the rays, however, is carried to such an 

 extent in this specimen that in extreme cases the entire spicule is reduced to a 

 perfectly spherical ball of concentrically laminated silica (opal). A precisely 

 similar modification of tetract megascleres occurs in the two known species of the 

 genus Yodomia [Lebwohl 1914, and Dendy 1916]. 



Previously known Distribution. Philippine Islands (Sollas) ; Ceylon (Dendy). 



Register Numbers, Localities, &c. II. 5 (four small specimens), off Poshetra, Jan. 7, 

 1906 ; IV. 3 (two large specimens), IV. 9 a (seven small specimens), off S.W. 

 coast of Beyt Island; XIV. (small fragment), off S.W. of Beyt, 6.1.06; XV. 2 

 (four specimens, varying greatly in size), three miles W.N.W. of Samiani Light- 

 house, 17 fms., 22.12.05 ; XX. 9 (one specimen), Adatra. 



2. Jaspis reptans (Dendy). 



Coppatias reptans Dendy [1905]. 



This species is represented in the collection by three specimens, of which it is 

 possible that R.N. XX. 4 and R.N. XX. 7 may be parts of the same. The shape is 

 extremely irregular. R.N. XX. 4 is a flattened, cake-like fragment, measuring about 

 35 by 25 mm., with a maximum thickness of 12 mm., and a rounded margin except 

 where broken. R.N. XX. 7 is a very irregular fragment of about the same size, throwing 

 off irregular digitiform processes. Both have a coarse, firm, harsh consistency and are 

 of a greyish-fawn colour in spirit (having been first preserved in formalin). R.N. 

 XXXIII. 2 b is a massive but flattened specimen measuring about 50 by 50 mm., and 



