26 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Amphidinium kofoidi, sp. nov. — Usually present during 

 1921 from August 11th onwards — often forming very large and 

 intense cocoa-coloured patches, which are strongly marked at 

 all times of tide. Maximum range from inner harbour north- 

 ward to just south of stream at about level of low water mark 

 of neap tides. (See Sketch Map 2). 



Description. Body slightly asymmetrical and 

 broadly ellipsoidal, the dorso ventral axis being about 0'8 of the 

 total length— flattened laterally and more convex on the 

 ventral than on the dorsal side. Epicone small and sometimes 

 retracted so as to be hidden in lateral view between the 

 projecting edges of the hypocone. Hypocone sack-shaped, 

 with its greatest width ( dorso ventr ally) at about 0*4 of 

 the total length from the posterior end. Left border of the 

 sulcus projecting beyond the right in the anterior ventral region. 

 Girdle deep, its two ends meeting without displacement. 

 Sulcus not extending as far as the antapex nor continued upon 

 the epicone. Transverse flagellum completely encircling the 

 body and usually easily visible projecting beyond the margins 

 of the girdle. Posterior flagellum extending beyond the 

 antapex and lying with its proximal part in the sulcus. Body 

 enclosed in a colourless homogeneous pellicle. 



Two amyloid bodies (?), situated one at about the middle of 

 each side. Numerous small refractile granules usually present 

 throughout the cytoplasm, which is a uniform light brown 

 colour. Nucleus posterior and slightly dorsal, very slightly 

 elongated and with the side next the surface of the body more 

 convex than the inner side. Anterior part of the hypocone 

 usually occupied by a large, rather clear region, which does 

 not take stains. Length about 50 to 80^. 



Amphidinium kofoidi, sp. nov., var. petasatum, var. nov. 

 This variety occurred abundantly during the summer of 1920, 

 but was not again recorded until June, 1922, when it appeared 

 in considerable numbers. Maximum range coincides with that 



