103 
Gen. Lithophyllum, Fosl. 
L. incrustans, Fos]. Common. 
Fig.: Hauck, Plate I, 4, 5 [as Lithothamnion polymorphum|. 
District: Port St. Mary. 
Zone: M.T. zone downwards. 
Occurrence: Perennial. 
Reproduction: Tetraspores in Winter. 
Gen. Lithothamnion, Fosl. 
L. colliculosum, Fosl, var. vosea, Batt. 
Notes: Recorded by Weiss 1900. 
L. calcaveum, Aresch. Common. 
Fig.: Harvey II, 153 [as Melobesia calcarea}. 
District: Port Erin; Fleshwick Bay; Port St. Mary. 
Zone: Well below L.W.O.S.T. 
Occurrence: Perennial. 
Notes: Only obtained by dredging. Bottom of Irish Sea round 
eastern shores of Isle of Man in many places covered with 
this species. 
L. lichenoides, Fosl. Frequent. 
Fig.: Harvey II, 156 [as Melobesia lichenoides}. 
District: Port Erin; Port St. Mary. 
Zone: M.T. zone downwards. 
®ccurtence: Perennial: 
Reproduction: Tetraspores and cystocarpia in Autumn, 
Notes: Found in pools epiphytic on Corallina. 
L. lichenoides, Fosl, var. agariciformis, Fosl. are. 
Fig.: Harvey II, 155 [as Melobesia agariciformis]. 
District: Dredged off Spanish Head. 
L. Lenormandi, Fosl, var. typica, Fosl. Frequent. 
nicer black, 1665, (Pl. Til, 4... +Rosenvinge-[l,:p. 217, 218. 
District: Port Erin; Port St. Mary; Castletown; Pooyllvaaish. 
Zone: M.T. zone and below. 
Occurrence: Perennial. 
Reproduction: Tetraspores and cystocarpia in Summer and Autumn. 
Notes: Common as a floor covering in pools. 
L. membranaceum, Fos. 
Fig.: Harvey II, 157 fas Melobesia membranacea}. 
District: Port St. Mary; Douglas Bay (Talbot). 
Occurrence: Perennial. 
Reproduction: Tetraspores recorded by R. J. Harvey-Gibson. 
Notes: Found on the fronds of Chondrus crispus. 
