. Bulletin of the Natural History Museum Zoology. . 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 , preserved in Steedman's solution, collected during JSL I Dive 2636 off The Bahamas; 25°'N 77°'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 (1954)
. Bulletin of the Natural History Museum Zoology. . 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 , preserved in Steedman's solution, collected during JSL I Dive 2636 off The Bahamas; 25°'N 77°'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 (1954) 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 , 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
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Keywords: ., bhlconsortium, bookcentury1900, bookcollectionbiodiversity, bookl
