FISHERY BULLETIN: VOL. 73, NO. 4 



0-2 mm 



Figure 8.— Petasmae of Nematoscelis: a, N. tenella; b, N. microps; c, N. lobata; d, N. atlantica. Ip, lateral process; ml, median lobe; pp, 



proximal process; ssp, spine-shaped process; tp, terminal process. 



Table 3.— Analysis of covariance on proximal process of the petasma and carapace 

 length of Nematoscelis gracilis "old form" (Indian Ocean) and the "new form." 



After accounted for differences in carapace lengths: 

 Between means 21.136 1 21.136 



Within groups' 4.186 57 0.073 



Regression (overall) 6.398 1 



289.534 <0.0001 



Total 



31.720 



59 



'0.600 is within SS (regression) removed. 



spine-shaped process, terminal process, proximal 

 process, and lateral process of petasma; basal 

 width of lateral process of petasma; number of 

 marginal setae on exopod of maxilla; number of 

 setae on second segment of mandibular palp. 

 Similarly, N. atlantica and N. microps differ as 



follows: in dorsal length of first abdominal seg- 

 ment; length of keel on carapace; lateral length of 

 sixth abdominal segment; length of carpus of first 

 thoracic leg; width of upper lobe of eye; lateral 

 length of carapace; length of carapace between 

 apex of keel and its posterolateral margin; length 



i 



808 



