34 2 Holmes,— New Marine Algae, 
more angular, thinner-walled, and not rounded as in C. uvaria , 
and there are definite series of smaller cells inserted between 
the larger ones, the superficial layer of cells is almost mono- 
stromatic, the leaflets can scarcely be said to be inflated, being 
filled with thin-walled cells, and the tetraspores are spherical, 
not oblong, as in C. uvaria . If placed in the genus Chrysymenia 
at all, it should form a distinct group between the Cryptarachne 
and Botryoclada sections. We have not been able to examine 
the cystocarps, but Professor Schmitz’s cystocarpic plant, of 
which he has kindly forwarded a sterile fragment, appears to 
be identical in structure with our plant. 
EXPLANATION OF FIGURES IN PLATE XVIII. 
Illustrating Mr. Holmes’ paper on New Marine Algae. 
Myrioglossa Beckeriana, n. sp. 
Fig. i. Frond, half the natural size. 
Fig. 2. Leaflet, bearing cruciate tetraspores. 
Fig. 3. Longitudinal section of ditto. 
Fig. 4. Tetraspores. 
Fig. 5. Transverse section of frond, showing distichous arrangement of leaflets.. 
Fig. 6. Longitudinal section of frond. 
Fig. 7. Transverse section of ditto. 
Ptilota cryptocarpa, n. sp. 
Fig. 8. Frond, natural size. 
Fig. 9. Transverse section of stem. 
Fig. 10. Longitudinal ditto. 
Fig. 1 1 . Longitudinal section of pinnule. 
Fig. 12. Apex of pinnule, showing concealed favellae. 
Fig. 13. Ditto in longitudinal section. 
Fig. 14. Transverse section below favellae, showing irwolucrate ramelli. 
Fig. 15. Apex of tetrasporic pinnule, showing forcipate ramuli clothed with 
short callithamnioid filaments. 
CORALLOPSIS ACULEATA, J. Ag., MS. 
Fig. 16. Ramulus bearing cystocarps, natural size. 
Fig. 17. Cystocarp, (x 50) in longitudinal section. 
Fig. 18. Ramulus bearing tetraspores. 
Fig. 19. Section of ditto, showing cruciate tetraspores in situ ( x 7°)* 
Fig. 20. Tetraspores ( x 200;. 
