BARGMANN1A REVISION 



59 



Fig. 8 Bargmannia amoena sp. nov. A. Upper, B. lower, and C. lateral views of mature nectophore from small specimen collected during JSL II Dive 976. 

 Scale bar = 1 mm. 



ruptured by the expansion of the gas within it. No pigmentation is 

 apparent. The pneumatophore is inserted onto the apical end of a 

 long stalk that, depending on the degree of contraction, can be 5-6 

 mm in length. As in B. elongala, this stalk is flattened at its base, 

 where it joins the nectosome, to form a hinge-like structure. 



Nectophore (Figures 7-9). The nectophores had a biserial, stag- 

 gered arrangement down the nectosome (Figure 6). The number of 

 nectophores found with each specimen varied from 5 to 32. Depend- 

 ing on the mean length of their nectophores, these specimens can be 



divided into three size categories. Seven specimens, all collected 

 during the same cruise in 1984, bore c. 10 relatively small nectophores 

 whose lengths were less than 8 mm. The mean length, for the mature 

 nectophores, was 7.41 ± 0.43 mm; the mean width 3.10 ± 0.22 mm; 

 and the ratio of the overall length to that of the nectosac averaged 

 1 .41 ± 0.06. None of these specimens was sexually mature. The bulk 

 of the specimens was included in second size category, where the 

 length of the mature nectophores ranged from 9 to 19 mm. These 

 specimens bore distinct, but immature, gonophores. Each specimen 

 averaged about 20 nectophores, whose mean length was 13.70 ± 



