6 Dr. G. J. Hinde on some neio 



They appear to be entirely restricted to the basal portion, for 

 I failed to find any gemmules in the broken stems and 

 branches. In this specimen they were entirely hidden from 

 view, and it was only by removing a small portion of the 

 incrnsting base that they were found attached directly to 

 the pebble beneath. 



The spicules of the monticular envelope are not more than 

 11 millim. in length by '015 millim. in thickness, thus con- 

 tiasting greatly in size with the spicules of the skeletal 

 mesh. The spicules are very closely arranged and appa- 

 rently united together in a distinct membranous layer. As 

 far as can be ascertained the gemmules are subglobular in 

 form ; I could not see any apertures in the few specimens 

 examined. An average example measured "6 millim. in 

 width. The amphidisc-spicules have short and very thick 

 shafts J they are "014 millim. in height, and the rotules '017 

 millim. in width. 



This species is closely allied to U. coraUioides, Bowbk., sp., 

 in its mode of growth, but is distinguished by the irregular 

 distribution of the oscules and their generally compound 

 character ,• the skeleton-spicules are also less robust. It like- 

 wise possesses gemmules which have not yet been definitely 

 recognized in Bowerbank's type form. From U. repens it is 

 distinguished by its mode of growth, the presence of oscules, 

 the larger forms and the micropunctation of the skeleton- 

 spicules, whilst the spicules of the monticular envelope are 

 smaller and the amphidisc-spicules are shorter and stouter. 

 From the Congo species of Uruguay a {Potamolepis) it is 

 marked off by its bushy mode of growth and the smaller 

 dimensions of the skeleton-spicules. 



Distrihution. Paraguay. No further information as to its 

 precise locality can be obtained. 



Uruguay a corallioides, Bowbk., sp. (PI. IV. figs. 15, 16.) 



1863. Spongilla corallioides, Bowerbank, Proc. Zool Soc. 1803, p. 22, 

 pi. xxxviii. fig. 13. 



1877. Spongilla corallioides, T. Higgin, Proc. Lit. and Pliil. Soc. Liver- 

 pool, 1877-78. 



1881. Uruguaya corallioides^ Carter (in part), Auu. & Mag. Nat. Hist, 

 ser. 5, vol. vii. p. 100, 



1884. tiruguaya corallioides, Carter, ibid. ser. 5, vol. xiii. p. 271. 



1887. Uruguaya corallioides, Vosmaer, Bronu's Klassen ii. Ordu. des 

 Thierreichs, Bd. ii. p. 347. 



1887. Uruguaya corallioides, Potts, Proc. Acad. Nat. Sci. Pliilad. 

 p. 2(J8. 



Sponge growing in bushy rigid masses from an incrusting 



