586 CORALLINACEAE. 



; Goniolithon EMzoplwrae Fosl. & Howe, Bull. N. Y. Bot. Gard. 4: 130. pi. 

 8S. f. 2. 1906. 



. ? GoniolitJw7i strictum nanum F'osl. & Howe, loc. cit. 131. pi. 8B. f. 7. 

 ? LitJiopTiyllum strictum nanum Lemoine, in Borg. Dansk Bot. Ark. 3M 164. 

 /. 159, 160. 1917. 



On rocks, old corals, shells of (sometimes living) molluscs, etc., in shallow water, 

 common, Rose Island, Berry Islands, Great Bahama, North Cat Cay, South Cat Cay, 

 Eleuthera, Exuma Chain, Watling's Island. Caicos Islands, and Great Ragged Island : 

 — Bermuda and Florida to American Virgin Islands. Type from Bermuda. 



7. Goniolithon strictum Fosl. K. Norske Vidensk. Selsk. Skr. 1900'': 14. 1901. 



Goniolithon intermedium Fosl. loe. cit. 15. 



Lithophyllum strictum Lemoine, in Borg. Dansk Bot. Ark. 3^: 164. 1917. 



Mostly unattached or forming mats, in shallow water, common. New Providence, 

 Rose Island, Andros, Berry Islands, Bimini, North Cat Cay, Cat Island, Watling's 

 Island, and Mariguana : — Bermuda ; Florida ; and Jamaica. Type from Florida, 



4. LITHOPHYLLUM PMlippi, Wiegm. ArcMv Naturgesch. 

 3^: 387. 1837. 



Conceptacles 80-160/* broad, usually abundant; thallus thin 

 ( 100-300 w thick), its surface nearly smooth or roughened by 

 substratum. 1. L. carihaeum. 



Conceptacles 200-600 u in diameter. 



Thallus thin (mostly 50-600w thick), smooth, forming subor- 

 bicular crusts 2-10 mm. broad, epiphytic ; vertical section 

 showing small cells in superficial layer only. 2. L. pustiilatiim. 



Thallus usually thiu (200-500/*; very rarely 5-10 mm. 

 thick) ; the surface showing imbricate, reniform-auriculate 

 or semiorbicular lamellae ; vertical section showing a regu- 

 lar alternation of vertically elongate cells and very short 

 flattened or discoid cells ; usually on shells, old corals, etc. 3. L. prototypum. 

 Thallus 0.5 mm.-6 cm. thick ; the surface with densely 

 crowded knobs, verrucae, or short branches ; vertical sec- 

 tions showing irregular, often subcrescentic or sublunate 

 zonations ; conceptacles 200-300/* in diameter, becoming 

 overgrown and included. 4. L. munitum. 



1. Lithophyllum caribaeum (Fosl.) Fosl. K. Norske Vidensk. Selsk. Skr. 1906«: 



22. 1907. 



Lithophyllum decipiens carihaeum Fosl. loc. cit. 1906^: 18. 1906. 



Forming thin white or light pink crusts on rocks, pebbles, and shells from just 

 above low-water mark down to 15 fathoms {Me Borgesen), Watling's Island and 

 Great Ragged Island : — Jamaica and American Virgin Islands. Type from the West 

 Indies. 



2. Lithophyllum pustulatum (Lamour.) Fosl. K. Norske Vidensk. Selsk. Skr. 



1904^: 3. 1904. 



Melohesia pustulata Lamour. Hist. Polyp. 315. pi. 12. f. 2. 1816. 

 Dermatolithon pustulatum Fosl. K. Norske Vidensk. Selsk. Skr. 1900^ 21. 

 1900. 



On Dilophus, Dictyota, Sargassum, Ilalimeda and Thalassia, in shallow water, 

 Berry Islands, North Cat Cay, Watling's Island, Atwood Cay, and Little Inaguu : — 

 New England to Jamaica ; Europe. Type from France. 



3. Lithophyllum prototypum Fosl. K. Norske Vidensk. Selsk. Skr. 1897^: 18. 



1897. 



Dermatolithon {?) prototypus F'osl. loc. cit. 1900^: 22. 1900. 



On old corals, shells, etc., near low-water mark or in shallow water, Exuma 

 Chain and Atwood Cay : — Florida ; Jamaica ; Porto Rico ; and American Virgin 

 Islands. Type from St. Croix. 



