38 aRAF ZU SOLMS-LAUBACH— MONOGEAPH OF THE ACETABULARIE^, 



6. Acetabidaria Peniculus, R. Br. Longit. section of a ray : b, the vestibule ; c, the central portion 



of the disc ; d, the coronal process with one of the two transversely placed hair-scars ; a, the 

 sporangium. X . 



7. Ditto. A cap-ray seen from above ; lettering as in fig. 6. X . 



Plate III. 



fig. I. Acetabtdaiia Farlowii, Solms. View of the fertile cap. X. ■' 



2. Chalmasia avtiUana, Solms. View of the corona superior from above. x . 



3. Ditto. View of the cap. X . 



4. Acicularia Schenckii, Mobius. View of the corona inferior from lower side of cap ; at a transverse 



section of the stalk. X . 



5. Chalmasia antiUana, Solms. A cap-ray in profile : a, the cut-off sporangium ; b, the coronal 



prominences ; c, the central portion of the disc. X . 



6. Acetabufaria Calyculns, Quoy et Gaimard. Profile view of cap-ray full of spores : a, the sporan- 



gium; b, the corona superior; c, the corona inferior ; d, longit. section of wall of stalk. x . 



7. Ditto. View of corona superior from above, x . 



8. Acetabularia ex'igua, Solms. Emptied gametangia, showing the lid apart, x . 



9. Acicularia Schenckii. Fragments of spore bearing lime-spicula : in several spores the lid is visible 



as a circular line, x . 



10. Acetabularia Caly cuius, Quoy et Gaim. Part of cap from below, showing the corona inferior. X . 



11. Acicularia Scliencliiiyyi^o^\Vi'&. Profile view of cap-ray. x. 



12. Ditto. View from above of corona superior, x . 



13. Acicularia Andrussowii, Solms. Surface view of the marginal portion of a fertile cap ; in each 



chamber a lime-spicula with two rows of spore-cavities, x . 



14. Acicularia Schenckii, Mobius. View of group of plants growing on a shell — brought from Brazil 



by Schenck. 



15. Ditto. Uninjured lime-spicula from the cap-ray, with its spore-cavities, x . 



Plate IV. 



Fig. 1. Acetabularia Mobii, Solms. Longit. section of a specimen with two superposed caps. From a spirit- 

 . specimen collected by Mobius at Mauritius, x . 



2. Acetabularia polyphysoides, Crouan. Side view of the corona superior, x . 



3. Halicoryne spicata, Kiitz. Chalk-spicula containing spores taken out of sporangium. x . 



4. Halicoryne Wrightii, Harv. Profile view of the fertile whorl : a, the sporangium ; b, the coronal 



prominences ; c, the basal portion. 



5. Ditto. View of the apical region of a young plant from a dried specimen (from Mactan, 



Philippines, collected by ' Challenger ' Expedition) in the British Museum. Sterile hair-bearing 

 and fertile whorls regularly alternating. The hair-whorls situated above are not drawn in so 

 as to permit the main axis to appear. This terminates in a cupola-Hke apex above the youngest 

 hair- whorl. 



6. Acetabularia polyphysoides, Crouan. J^rofile view of a cap-ray from a dried plant (whence the 



collapse of the spo.angium) - aab, corona superior : c, the central portion of the disc. X . 



7. Halicoryne spicata, Kiitz. Single spore after decalcification, showing the thick stratified cell- 



meaibrajie and the lid. x . 



