585 



Gran in his lasl paper proposed the name C. horridum for the 

 group oi* forms the extremes of which are C. horridum Cl. s. sir. and 

 C.tripos var. »scotica Schutt« or C. tripos, var. intermediet Jorg. Although 

 I cannot agree with hini in his argument on the name »scotica Schutt«, 



Fig. 136. 



Fig. 137. 



Fig. 13S. Fig. 139. 



Kig. 136. Ceratlum horridum (Cl. , t.tgpica ('■ran: hvo specimens with radier short antapical-horns 

 Fig. 137. Ceratlum horridum (Cl.), f. tgplca Gran, a specimen with long antapical-horns «' 

 Fig. 138. Ceratlum horridum (Cl.), a specimen, intermediate between t.tgpica and (.intermediet (. ,M /i). 

 Fig. 139. Ceratium horridum (Cl. , f. intermediet Jorg., two specimens ( lM li). 



I prefer to follow him in naming the whole group C. horridum; the 

 most important is, however, to have the same names for the same 

 forms. 



I have given some figurcs of the forms ranging from the 

 strongly spiniferous f. genuina Gran to the almost unspiniferous 

 f. intermediet (Jorg.) Gran. 



The {'orm genuina is rather rare around the Færoes; it occurs 

 sparingly from March to September. The form intermediet is found all 



