seven cover slips were used for appendages from one 

 specimen in standard groups on one microscope slide. 

 Slides carefully sealed have endured without notice- 

 able change for 2 yr. 



Body length was measured from the anterior border 

 of the prosome to the posterior edge of the caudal 

 rami. 



All figures were drawn with the aid of a Wild M20 

 drawing tube. Unless otherwise stated, illustrated 

 specimens are from Arctic collections. Except for a 

 few figures of the left swimming legs and one of the 

 left first maxilla gnathobase, all illustrated append- 

 ages are from the specimen's right side. First anten- 

 nae are shown in ventral view. Maxillipeds are shown 

 in anterior view. All other appendages are shown in 

 posterior view. The letter after each figure legend 

 refers to the 0.1 -mm scale to which the figure was 

 drawn (Fig. 225). 



Counts of Arctic spinocalanids from below 500 m 

 are from entire samples; most estimates of total 

 specimens from above 500 m are based on counts from 

 subsamples, one-half to one-twentieth of whole 

 samples (Table 2). Many specimens were 

 enumerated, but only the relatively few specimens in 

 good condition were examined for descriptive pur- 

 poses (Table 1 and lists of specimens studied). 



Material Studied 



During the systematic study of Arctic spinocalanids 

 it was necessary to obtain specimens from other 

 collections for comparison and for supplementing 

 published descriptions. An effort was made to ex- 

 amine a maximum number of critical type specimens 

 and specimens on which widespread records are bas- 

 ed. Arctic specimens of the present collection are 

 listed in Table 1 and borrowed specimens are listed in 

 Table 3. Locations for samples from dates listed in 

 Table 1 can be interpolated from Figures 1, 2; the 

 sample from 5 May 1968 was taken at about lat. 

 82° 19^, long. 158°16W. 



Abbreviations used in the descriptions are listed 

 below: 



Ce cephalosome; head region including 



the somite of the maxillipeds 

 Thl-Th5 somites of legs 1-5 

 A1-A2 antennae 1-2 

 Mn mandible 



Mxl-Mx2 maxillae 1-2 

 Mxp maxilliped 



P1-P5 legs 1-5 

 B1-B2 basipod segments 1-2 



Table 3. — Sources of borrowed specimens. 



