210 MISS I. B. J. SOLLAS OX THE [June 17, 



but the oviducts open one on each side of the single median sac. 

 The arrangement with lateral branches is the most common one 

 among the species of the genus Polytoreutus ; and it is interesting 

 to find them recapitulated in the young of Polytoreutus montis- 

 kenyce, whose adults have not the blanches in question. 



7. On the Sponges collected during the " Skeat Expe- 

 dition " to the Malay Peninsula, L899-1900. By 

 Igekna B. J. SoLLAS,' B.Sc. (Lond.), Bathurst Student, 

 Newnliani College, Cambridge, 



[Received May 15, 1902.] 



(Plates XIV. & XV.^) 



These Sponges were kindly entrusted to me foi- description by 

 Dr. S. F. Harmer, F.R.S. They were obtained by Mr. R. Evans, of 

 Oxford, by shore-collecting in two localities: — " (i) Pulau Bidang, 

 one of the Nine Islands gioup, off the coast of Kedah on the west 

 coast of the Malay Peninsula, I'unning N.E. fi'om the Island of 

 Penang ; (ii) Great Redang coi'al islands off the coast of Treng- 

 ganu State (S. of 5° 50' N.), which again is S. of Kelantan, the 

 lai-gest of the East-coast States." Thus, being a shore collection, 

 the majority of the species I'epi'esented in it belong to the group 

 Monaxonida ; the remainder are Tetraxonia and Keiatosa. 



In dealing with the repi'esentatives of the simpler Monaxonida 

 I have contented myself with mere description, leaving the 

 species undetermined. In the present state of classification of 

 tlrese species this seems to be the only satisfactoiy course open to 

 any woi'ker not prepared to make an exhaustive study of all the 

 species of a genus. 



Monaxonida. 



1. Reniera sp. (Plate XIV. fig. 5.) 



Sponge growing on the back of a ciab, of which it conceals 

 completely the dorsal view. 



Consistency gelatinous. Measuring from 1 to 2 cm. aci'oss. 



Spicrdes slightly bent oxeas, 0-075~-0-090 X 0-003-0-004 mm. 



Spongin abundant at the nodes of the spicular network. The 

 mesh is square. Single spicules project vertically from the dermal 

 membrane. 



In one of the two specimens in the collection, but not in the 

 other, there ai'e a few multispiculai' strands in the othei'wise very 

 regular unispicular mesh work. 



Pulau Bidang and Great Redang. 



2. Reniera sp. (Plate XV fig. 11.) 



Sponge encrusting, growing on an encrusting Polyzoon and 

 ■ forming a thin sheet from 1-2 mm. in thickness. Oscula 



1 Commuiiicated by Dr. S. F. Haemee, F.Z.S. 

 - For explanation of tlie Plates, see p. 221. 



