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THE ROYAL SOCIETY OF CANADA 



carapace remained completely unstained, but the larval body was 

 somewhat overs tained and to correct this the specimen was transferred 

 to acidified alcohol, with the result that the carapace material was 

 almost entirely dissolved, the slight amount that remained causing 

 the larva to adhere so firmly to the pipette used to effect its transfer 

 that it could not be recovered without serious injury. The admirable 

 preservation of the carapace in formalin and its solution in acid 

 alcohol would seem to indicate that it is composed of a mucin-like 

 material. 



Fig. 11. Type v larva. From ventral surface. At^, first 

 antenna; At-, second antenna; mn. mandible. 



The larval body is decidedly kite-shaped and clearly divisible 

 into two regions, an anterior naupliar and a posterior metanaupliar, 

 the latter being outlined laterally and posteriorly by a distinct groove 

 and terminating in two rounded projections, each of which bears a 

 short spine. The anterior border of the naupliar region is produced 

 at either extremity into a moderately strong process, recalling the 

 condition in Balanus larvae, and slightly behind the border in the 

 median line is a pair of short, recurved, frontal processes. The 

 metanaupliar region showed no indication of segmentation and no 

 naupliar eye could be distinguished. 



The three pairs of naupliar appendages were alone present. 

 The first antennae were apparently two-jointed, the basal joint being 



