110 OKHAMANDAL MARINE ZOOLOGY REPORT PART II 



but with a tendency to form slender, multispicular primary lines running towards 

 the surface. 



The oxea are slightly curved, sharply and fairly gradually pointed, and 

 measure about 0-2 by 0-009 mm., being thus a little larger than those of Topsent's 

 specimens, from which they also differ in the absence of abnormal forms. 



Previously known Distribution. Magellan Straits (Topsent) ; Punta Arenas 

 (Thiele). 



Register Number, Locality, &c. XXVI. 6, Adatra Reef, 25.12.05. 



is. Reniera hornelli n. sp. (Plate II., Fig. 11). 



The sponge (Fig. 11) consists of an irregularly subglobose body contracted 

 almost (or quite) to a short stalk at the point of attachment. There are numerous 

 large vents, scattered, usually on more or less strongly developed prominences, over 

 the upper parts of the sponge, and varying in diameter up to about 5 mm. 

 Each vent is the terminal opening of a very deep, cylindrical oscular tube. The 

 largest specimen measures about 45 mm. in height by 53 mm. in greatest breadth. 

 The surface of the sponge has a characteristic woolly appearance, due to the fact 

 that the sponge-tissue is broken up into a sort of network of villi by the in- 

 numerable narrow, but deep and close-set, inhalant canals. In life the surface 

 was doubtless covered all over by a very thin, translucent, pore-bearing dermal 

 membrane, but this is now nearly all rubbed off. The texture is very soft, 

 spongy and resilient ; the colour in spirit, pale yellowish-grey. 



The main skeleton consists of numerous slender, multispicular fibres running 

 at right-angles to the surface at distances of about one spicule's length from one 

 another. These lines are united with one another cross-wise by numerous single 

 spicules and the whole skeleton forms a rather irregular, almost isodictyal network. 

 The dermal membrane appears to be almost aspiculous, and one cannot speak of a 

 definite dermal skeleton. There is very little spongin present in any part of the 

 skeleton. 



Spicules. Rather slender, slightly curved oxea, gradually and sharply pointed 

 at each end ; measuring about 0-14 by 0-008 mm., but somewhat variable and often 

 more slender. 



I have much pleasure in naming this beautiful and well-characterised species 

 after its discoverer, Mr. James Hornell. As there are four specimens in the 

 collection it is probably not uncommon on the west coast of India. 



Register Numbers, Localities, &c. II. 12 (locality uncertain) ; IV. 4, three 

 specimens, dredged off S.W. coast of Beyt Island. 



19. Reniera fibroreticulata n. sp. (Plate II., Fig. 12.) 



The sponge (Fig. 12) has the appearance of being made up of short, ana- 

 stomosing branches, sometimes united laterally so as to give a plate-like form, 



