220 University of California Publications in Zoology. [Vol.8 

 Measurements of Gonyaulax diegensis 



Ten individuals taken in surface plankton June 27. 1905, off San 

 Diego, were respectively 70, 75, 75, 80, 80, 83, 87. 90, 92, and lOO^t in 

 length. 



Variation : This species varies greatly in size, in girdle dis- 

 placement (3 to 6 girdle widths) and overhang (0 to 1.5), in 

 the degree to which reticulations are developed and thickened, 

 and in the widths of the intercalary bands and the distinctness 

 with which they are marked out. In all individuals which I have 

 examined, however, the bands are detinitely discernible. The 

 smaller forms (60 by 45jti) are found in the same collections with 

 the largest ones and seems to represent merely the extremes in 

 variation, though the most of the individuals are 7;^ or more 

 in length. 



Synonomy : It seems possible but by no means certain that 

 the form figured by Schiitt (1895) is this species, since it has the 

 size, the general form, the color and the three antapicals char- 

 acteristic of it. Wright's (1907) figure is open to a similar inter- 

 pretation. Neither has, however, indicated the intercalary bands 

 usually apparent on the less heavily marked specimens of the 

 species. 



Meunier (1910) figures as G. poly gramma a form which is 

 not even remotely like that species, though he comments upon 

 the resemblance to G. spinifera. His magnification is unfortu- 

 nately not given. In proportions, girdle, and surface markings 

 his form is so remarkably like G. diegensis that I am constrained 

 to include it in the synonomy of that species. This is the only 

 species which he refers to Gonyaulax. 



