344 ON THE FLORIDEJS AND ON SOME NEWLY-FOUND ANTHERIDIA. 



that algologist to correctly describe this fruit at a suitable oppor- 

 tunity. I will only say here that it is terminal, although it was sup- 

 posed to have been lateral. It is, however, very probable that this 

 is the first cystocarpic fruit seen of this curious species, more cor- 

 rectly known now as Bostrychia scorpioides. 



I saw the plant in great plenty at Stoke Gabriel on the River 

 Dart last August, and although tetraspores were abundant the 

 most careful search gave me no additional specimen of the 

 cystocarps. 



DESCRIPTION OF PLATES. 



Plate X. 



Fig. 1. — Procarp and trichogyne of Callithaninion tetricum X 300. 



2. — Trichogyne of the same with three antherozoids attached 



X 500. 

 3. — Antheridinm of the same X 200. 

 4. — Small portion of Call, byssoideum X 40. 

 5. — Three antheridia of the same X 600. 

 6. — Antheridia of Call. Turneri X 200. 



Plate XI. 



Fig. 1. — Call, plumula with three antheridia X 80. 



2. — The same, showing different stages of development X 1,000. 

 3. — Portion of a filament of Griffithsia corallina with three anthe- 

 ridia in situ X 25. 

 4. — An antheridium of the same removed X 200. 

 5. — Antherozoids of the same x 800. 



Plate XII. 



Fig. 1.— Two antheridia of Piilota elegans X 200. 



2. — Two dissepiments of Ceramium diaphanum, the upper one sur- 

 rounded with antheridia, X 50. 



3.— The latter x 200. 



4. — Two dissepiments of Cer. striatum, the upper one invested with 

 antheridia, X 50. 



5.— The latter x 300. 



