1902.] ON FISHES FROM EAST AFRICA. 221 



Surface covered with lowconuli 1-2 mm. apart and 0*2-0'4mm. 

 in height. 



Oscula (?) minute, inconspicuous near the tips of the lobes. 



The skeleton consists of a network of very thin fibi'es, which are 

 not distinguishable into main and secondary, and are uniformly 

 areniferous. They form for the most part square meshes about 

 0'64 mm. in breadth. 



Fibres 0-03 -0-06 mm. thick. . 



The ectosome is a thin layer of cystenchyma, thickest at the 

 tips of the lobes. Only in this layer are spongoblasts obvious. 



Spermatozoa are present in A'arious stages and in great 

 abundance. 



The ciliated chambers measure '07 X "04 mm. on an average. 



The whole choanosome is permeated by a filamentous alga 

 (? Oscillaria spongelice). 



Great Redang. 



EXPLANATION OF THE PLATES. 

 Plate XIY. 



Fig. 1. One of the digitiform processes of Giocali/pta meliclilora, p. 214. Nat. size. 



2. Cinachi/ra malaccensis (p. 219), slightly larger than nat. size. 



3. Spirastrella inconstans (p. 216), attached to a fragment of stone. Nat. size. 



4. SpoHgelia digitata (p. 220), attached to a branch of dead coral. Nat. size. 



5. Beniera sp. 1 (p. 210), growing on a crab. X 2. 



6. A section of Pseudosiiherites cava (p. 217). X 15. 



7. Giocalypta rivtila (p. 215), almost the entire specimen. X f. 



8. ISsperella sulevoidea (p. 213), in section. X 20. 



9. JE. sulevoidea (p. 213), entire specimen. X ^. 



PlATE XV. 



Fig. 1. Microcalthrops and spined microxea of Dercitus pauper, p. 218. 



2. One complete mesh of the skeleton of Spongelia digitata, p. 220. 



3. Beniera sp. 5 (p. 211). a, node of the skeletal network ; b, egg ; c, ciliated 



chamber; d, isolated spicule; e, piece of fibre with chaplet-cells ; /, isolated 

 chaplet-cell ; /', its segment of fibre. 



4. Spicules of SaSerifes laxosuberites, p. 217. 



5. Megascleres of Cinachyra malaccensis, p. 219. 



6. Sigmata and centrangulate sigmata of Gellius centrangulatus, p. 212. 



7. Sigmata, toxa, and centrangulate sigmata of Gellixis Sagittarius, p. 212. 



8. Spicules of Ciocali/pta melichlora, p. 214. 



9. Spicules oi Siemma deniocratica, p. 213. 



10. Spicules of JSsperella sulevoidea, p. 213. 



11. Spicules of Beniera sp. 2, p. 210. 



8. On the Fishes collected by Mr. S. L. Hinde in the 

 Kenya District, East Africa, with Descriptions of Four 

 new Species. By G. A. Boulenger, F.R.S. 



[Received May 30, 1902.] 



(Plates XYI. & XVII.^) 



The zoological collection recently made by Mr. S. L. Hinde in 

 British East Afi-ica contains a series of Fishes from the Mathoiya 

 River, in the Kenya district, which usefully supplement our 



1 For explanation of the Plates, see p. 224. 



