MASSEE : MARINE ALG^ OF SCARBOROUGH. 



Leathesia difFormis Aresch. 



On rocks exposed at low water ; rare at Scarborough, but 

 abundant on Filey Brig. 

 Chordaria flagelliformis Ag. 

 Mesogloia vermicularis Ag. 

 Castagnea virescens Carm. 



Carnelian Bay. 

 Asperococcus echinatus Grev. 



South Bay ; not so abundant here as at Filey and Bridlington. 

 Chorda filum L. 

 Laminaria saccharina L. 



North and South Bays; not common, and the fronds are small. 

 Laminaria digitata Turn. 



Rare. Behind the outer reef, North Bay. 

 Laminaria digitata var. stenophylla. 



This is the common form, which differs from the type in having 

 a weak drooping stipes, compressed upwards. Laminaria digitata 

 does not flourish above low water mark, and has a terete erect 

 stipes. 



Laminaria bulbosa Lam. 



Two or three plants have been found washed up in the North 

 Bay ; it has not been met with growing. 



OOSPORE /E. 



Ascophyllum nodosum (L.) Le Jolis. 



This genus differs from Fuciis m having a linear thallus without 

 a midrib, and only four oospheres in a mother-cell. 

 Fucns vesiculosus L. 



Abundant in the North Bay; nearly absent from the south 

 side of the Castle rock. 

 Fucus serratus L. 



Abundant in the South Bay ; not common in the North. 

 Fncus canalicnlatus T. 



On shelving rocks in Carnelian Bay ; left dry at low tide. 

 Halidrys siliquosa L. 



Rock pools, South Bay. 

 Himanthalia lorea Lyngb. 



Sparingly in the North Bay. 



FLORID E^. 



Trentepohlia virgatula Harv. 



Common on the smaller Florideae. 



Aug. 1885. 



