JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATES II & III, 



Illustrating Professor Perceval Wright's Notes on Sponges. 



PLATE II. 



Wyvillethomsonia Wallichii, sp. iiov. 



Fig. I. Specimen in the Museum of tlie Royal Microscopical Society. Nat. 

 size. 



„ 2. Same, enlarged. Some ' gemmule'-like bodies are seen imbedded 

 in the mass. The object is drawn as seen when focussed down 

 nearly to the equatorial margin, hence many of the stellate spi- 

 cules are not seen. 



„ 3. Furcated attenuato-patento-ternate spicule of Bowerbank (50). 



„ 4. Stellate spicules of the bark layer. 



„ 5. Recur vo-teruate spicule, Bwk. (54). 



„ 6. Expando-ternate spicule, Bwk, (128). 



PLATE III. 



Hyalonema mirabilis. Gray. 



Osuluni from the interior of the Sponge mass, near the place where the 

 ' glass coil ' ends. Upper figure enlarged; lower figure showing 

 three spiculate cruciform spicules, the cruciform portion not 

 spiculate, and the stem more spiculate than usual. 



