ON A NEW GENUS OF RECENT FUNGIDA. 417 



Fig. 7. Palpus, with portion of mentum, q, attached, h. Wall of mouth- 

 cavity, as before ; k, forward side of paraglossum ; p, muscle inserted 

 into paraglossum, and withdrawing same; rt. as before. 



Plate XIX. 



8. Section through base of tongue and mentum, extended, g, Mentum ; e, 



lora ; I, hyaline rod of tongue ; n, feeding groove ; t, salivary valve ; 

 0, lever of tongue, as in fig. 6, side view ; jp, paraglossum ; q, ridge 

 from posterior side of salivary valve, united with lever o; s', muscle 

 acting on posterior side of valve ; ^ and s^ as before ; to. muscle in- 

 serted into foot of lever o, and throwing same forward. 



9. The same, retracted. 



Pig. 10. Transverse section through tongue near base. I, Hyaline rod ; m, 

 membranous bag ; 11, feeding groove. 



11. The same, towards the end. 



12. Ladle-like organ at end of tongue, sometimes called the " button." I, 



Hyaline rod of tongue, showing bifurcation. 



13. The same, end view. 



14. The same, side view. 



15. Branched hairs on same. 



16. Hairs on the inside of membi'anous bag, m, of figs. 10 and 11, from 



above, showing ridges of papillae upon which they stand. 



17. Side view of same. 



18. Side view of same near the anterior end, showing irregularly shaped 



pajDiU^e. 



19. Hairs on surface of tongue with expanded bases. 6, Sensory bristles 



scattered through same. 



20. The same, from base of tongue. 



21. Portion of blade of maxillse. aa, Plications; hh, sensory bristles, the 



longer ones on shorter pillars ; cc, the same, the shorter ones on 

 longer pillars ; d, longer hairs of same. 



22. Anterior end of mentum (without muscles), showing salivary valve ; I, 



Base of hyaline rod springing from chitinous tongue. 



23. Transverse section of same. 



24. Posterior end of tongue, showing feeding groove, n. 



25 & 26. Diagrammatic view of tongue when feeding, t, valve. Fig. 25 is 

 the position of tongue and internal parts as it arrives at the termina- 

 tion of the extension motion. Fig. 26, The same, at the termination 

 of the retraction motion. 



On a new Grenus of Eecent Eungida, Family Funginse, Ed. & H., 

 allied to the genus Micrahacia, Ed. & H. By Prof. P. Maktin 

 Duncan, E.E.S., Yice-Pres. Liunean Society. 

 [Eead 5th June, 1884.] 

 (Plate XX.) 

 G-enus Diafungia, genus nov. 

 Corallum discoid, free, without trace of adhesion, not quite 

 circular in outline, much broader than high. Base with a 

 primary triangular piece extending beyond the centre, slightly 

 projecting downwards, the rest of the coral grouping from its 

 sides and apex, so that there is an appearance of former fracture 

 and subsequent mending. Calice unsymmetrical from the prolon- 

 gation of the larger septa of the primary piece beyond the 



