58 



P.R. PUGH 



Fig. 7 Bargmannia amoena sp. nov. A. Upper, B. lower, and C. lateral views of mature nectophore from type specimen collected during JSL II Dive 1458. 

 Scale bar = 5 mm. 



Paratype. BMNH 1998.2165, preserved in Steedman's solution, 

 collected during JSL I Dive 2636 off The Bahamas; 25°53.2'N 

 77°48.3'W; 5-xi-1989; 890m. 



MATERIAL EXAMINED. 67 specimens have been collected during 

 40 dives by the submersibles JSL I and II. Of these, 52 have been re- 

 examined for this description. Some of the material originally 

 ascribed to B. elongata by Totton ( 1 954) probably belongs to this 

 species. In addition, some poorly preserved nectophores have been 

 found in recent Discovery collections. 



Diagnosis. Apico-lateral ridges of nectophores smoothly curved, 

 without pronounced bends; their outer branches terminating well 

 above the ostium, before reaching the relatively small lateral ostial 

 processes. No additional ridges. In smaller specimens central thrust 

 block pointed with small digitiform process apically; in larger ones, 

 latter folded over ventrally so that, in upper view, thrust block 



appears roundly truncate. In preserved specimens, ostium opens 

 basally. Nectosac more translucent than that of B. elongata. Ratio of 

 overall length of nectophore to that of nectosac averages 1.42, 

 varying slightly according to the size of specimen. Bracts of two 

 types; both delicate and foliaceous, with two pairs of lateral teeth; 

 without patches of large ectodermal cells. 



Description. Photographs of living specimens collected during 

 JSL II dives 968 and 1687 are shown in Figure 6. The specimens 

 from the JSL collections fall within three size classes, based on the 

 length of the mature nectophores, but also reflected by the degree of 

 sexual maturity. All the smaller specimens were colourless, while 

 the largest ones had bright orange-red basigasters; the basal part of 

 the gastrozooid. 



Pneumatophore. The pneumatophore measured approximately 

 3 mm in height and 1 .5 mm in width, but was highly distorted and 



