"i 8/C] THE SECRETARY ON ADDITIONS TO THE MENAGERIE. 775 



Plate LXXIX. 



Chah Mat a. 



Fig. 1 represents the sponge, about half its natural size. 



2. One of the depresso-spinulate spicule of the skeleton, X 420 linear. 

 •':>. A small portion of the scalariform structure of the skeleton, with 

 portions of the interstitial membrane, X 123 linear. 



4 represents a longitudinal section of a diluvial flint presented to me by the 



late Dean Buekland, containing a fossil sponge closely allied to 

 ( 'kalina vi rticilla (a, exhibiting a section of the pedicle and the series 

 of verticillate plates of the sponge, very closely resembling the recent, 

 sponge, natural size. 



5 represents a small specimen of a fossil verticillate sponge, the margins of 



the plates remaining uncovered, while the intervals between them 

 are filled by the enveloping sponge, natural size. 



6. A longitudinal section of a small specimen closely resembling the one 



represented by figure 5, exhibiting the immature development of the 

 verticillate plates of the sponge and a section of its central column, 

 natural size. 



7. A fine specimen of a verticillate fossil sponge, only half of which is 



completely enveloped longitudinally by the parasitic sponge, natural 

 size. 



Plate LXXX. 



Ophlitospongia fucoidea. 



Fig. 1 represents the sponge, two thirds its natural size. 



2. One of the shortest of the spicula of the skeleton-fibre, X 2.30 linear. 



3. An average-sized long spiculum of the skeleton-fibres. X 250 linear. 



4. A small portion of the skeleton-fibre, exhibiting the great number of the 



spicula with which they are furnished, and the mode of their dis- 

 position, X 80 linear. 



Plate LXXXI. 

 Raphiodesma radiosa. 



Fig. 1 represents the sponge, rather less than half the natural size. 



2. The marginal portion of a thin slice of the sponge at right angles to the 

 surface, exhibiting the radiation of the distal terminations of the 

 skeleton-fasciculi, projected through the dermal membrane to form 

 the minute hispidation of the surface, X 61 linear. 



.3. A small portion of the dermal rete, X 61 linear. 



4. One of the rosette-shaped groups of dentato-palmated inequianchorate 



retentive spicula, X 360 linear. 



5. An acuate skeleton-spiculum, X 360 linear. 



December 5, 18/6. 

 Dr. E, Hamilton, V.P., in the Chair. 



The Secretary read the following report on the additions to the 

 Society's Menagerie during the month of November 1876 : — 



The registered additions to the Society's Menagerie during the 

 month of November were 85 in number. Of these, 36 were acquired 

 by presentation, 14 by purchase, 4 by exchange, 3 by birth, and 28 

 were received on deposit. The number of departures during the 

 same period, by death and removals, was 97. 



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