188 WILLEY. 



fairly plentiful. The species of Sagitta is S. elegans Verrill (Hunts- 

 man, 1919, p. 445). It should be mentioned that Acartia was present, 

 but as it apparently passes readily through the meshes of the net 

 employed, it does not appear in the records. One Metridia longa 9 , 

 one Temora longicornis 9 , and one C. finmarchicus cf were seen. The 

 percentage count showed predominance of C . finmarchicus, stage V: — 



C. finmarchicus V 73 per cent. 



« VI (adult) 9 



Pseudocalanus elongatus 9 " 



Tortanus discaudatus 9 " 



The climax of this macrocalanoid intrusion was reached on Febru- 

 ary 23, 1917, though the quantity, 85 cc, was a little below that of 

 December 8. Many large Sagittae were present. There was a 

 sprinkling of large copepods, conspicuous amongst the rank and file 

 composed of C. finmarchicus, but not in sufficient numerical strength 

 to appear in the percentage estimation, so that in such a gathering 

 as this, the count alone would fail to convey its most distinctive 

 features. One characteristic however is not lost in the table, namely, 

 the large number of male C. finmarckicus: — 



C. finmarchus V 36 per cent. 



« 9 27 " 



& 20 



Pseudocalanus elongatus (cf and 9 ) 13 " 



Tortanus discaudatus (cf and 9 ) 4 " 



[There was a solitary larva of the Greenland sculpin, 8 mm. in length, 

 identified by Dr. Huntsman]. 



In this setting of C. finmarchicus there was a scattering of Metridia 

 longa, male and female, and, standing out boldly from the mass, 

 C. hyperhoreus and Euchacta norvcgica. The sample denotes the winter 

 Calanus maximum for 1917 in Passamaquoddy Bay in the tidal 

 channel of the St. Croix River. 



On April 7 following, the mass of plankton (51 cc.) at station 6 

 consisted of a nearly pure culture of Balanus nauplii with C. finmarchi- 

 cus (males, females and juniors) sprinkled sparsely through it. On 

 May 1st, Sagitta, Calamis, and the comb-medusa (Pleurobrachia) 

 were present, but the bulk (70 cc.) was pure Balanus, nauplii and 

 cypris-larvae in subequal numbers, the latter somewhat more numer- 

 ous and, being heavier, tending to collect in a layer at the bottom, the 



