. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 86 DISCOVERY REPORTS Nectopyramis spinosa Sears, 1952. (Plate V, fig. 1.) ? = Hippopodius cuspidatus Moser, 1925. During a period of many years I have picked out from 'Discovery' catches three very curious Prayid nectophores, which I think may be what Moser (1925) described and rather inadequately figured as ? Hippopodius cuspidatus. A fourth was taken in a closing net fished from 1000 to 250 m. by ' Scotia' in 1951 to the west of Ireland in W. long. 170 03', and a fifth also by ' Scotia' in 540
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 86 DISCOVERY REPORTS Nectopyramis spinosa Sears, 1952. (Plate V, fig. 1.) ? = Hippopodius cuspidatus Moser, 1925. During a period of many years I have picked out from 'Discovery' catches three very curious Prayid nectophores, which I think may be what Moser (1925) described and rather inadequately figured as ? Hippopodius cuspidatus. A fourth was taken in a closing net fished from 1000 to 250 m. by ' Scotia' in 1951 to the west of Ireland in W. long. 170 03', and a fifth also by ' Scotia' in 540 15' N., 140 32' W. at the same depth. The nectophores are of two kinds, and there are three of the first and two of the second. The first has a very minute obsolescent nectosac (Text-figs. 40 A, B) and the second a much larger functional nectosac (Text-fig. 40 C). In both kinds the radial canals arise separately as in Nectopyramis thetis. v^r-s. ~ "iy^Cradd. Rbuc Nsobs Text-fig. 40. Nectopyramis spinosa Sears. A, dorsal view; B, lateral view of nectophore of first type, with obsolescent nectosac, 'Scotia' 1951 Cruise, St. 363 ; C, lateral view of nectophore of second type, with functional nectosac, 'Discovery II' St. 1639. *9-5- Although there is some variation in the arrangement of spinose ridges in the first group of three nectophores with obsolescent nectosac, there are elements in their arrangement that can be compared with that in the second group of two nectophores with the larger nectosac. For instance we find the same dorsal-median and what I will call ' buccal' ridge in both groups; but more material is needed to complete the morphological account. Nectopyramis (including Archisoma) is the only Prayid genus known in which the nectophores bear ridges. We may have here, in the existence of two types of nectophore, a phenomenon similar to that found in Amphicaryon, where one nectophore has an obsolescent nectosac. This would be of special interest seeing that other
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