SYSTEMATIC AND BIOLOGICAL ACCOUNT 137 



Quite recently, since this report was drafted, it has been found that C. amygdalina was present at 



'Discovery II' Ice-Edge-Cruise Stations between 59 and 98 E., and at another Ice-Edge Station 



1723- 



A 



Cp°-~ 



Crad/at 



P/K4 



-~P/M 



C.ptd 



Text-fig. 69. Crvstallophyes amygdalina. A, lateral view of anterior nectophore, 'Discovery II' St. 663, 1000-750 m. ; B, C, 

 ventral views of posterior nectophores; B, 'Discovery' St. 129, 500-250 m. ; C, 'Discovery II' St. 663, 750-50001., x 14. 



Heteropyramis maculata Moser, 1925. (Text-fig. 71.) 



Moser described this species from specimens taken in seven open vertical hauls from deep water 

 made between the Cape Verde Islands and Ascension Island. At one station on the equator 'Gauss' 

 took a great number of nectophores in a vertical haul from 3000 m. Leloup (1934a) recorded it from 

 the South Georgia region. 



Moser commented on the strong dorso-ventral flattening of the nectophore, on the open hydroecium 

 running the whole length of the nectophore, and on the long somatocyst seated on the apex of the 

 nectosac, the apex of which only reached the middle of the nectophore. Moser also drew attention to 

 a number of opaque (pigmented) patches found, one at the apex, one at the basal end of each lateral 

 ridge, and from two to five more, according to size in between, on each lateral ridge. The lower two 

 are sometimes small, as if in process of formation. 



Such opaque spots are known only in the nectophore and the alleged eudoxid of this species. The 

 phenomenon may be related to similar ones occurring in several other siphonophores. For example, 

 Bassia bassensis has long been known to have opaque ridges. 1 Also in Diphyes bojani parts of the ridges 

 of the special nectophore of the eudoxid are sometimes opaque, and in Chuniphyes multidentata the 

 same phenomenon is common. It is probably related also to the phenomenon occurring in Hippopodius 

 hippopus and in the anterior nectophores of some species of Abylids, where preserved nectophores 



1 Huxley (1859) said that they were dark blue when the animal was alive. 



18 



