35 



We begin with facet A (textfig. 41) the same facet in Abyla trigona 

 and A. Haeckeli which surrounds the aperture of the nectosac. It consists 

 of the ridges z, //, h, g. 



Ridge g belongs to facet E (textfig. 42) as in Abyla trigona and 

 A. Haeckeli. The other ridges of facet E are again ridges k, k and d. 



Ridge d is the superior one of a complex of facets which we might 

 identify with D, CII and CI of our A. Haeckeli (textfig. 43). 



Then the side-ridge r would consist oi c + b Ar e-\r o\- e" . The ridges 

 a and p have quite disappeared. Near the point where in A. Haeckeli 

 we find ridge /, the ridges form together the posterior side of the necto- 

 phore, whilst ridge b and c are situated on the top of the nectophore. 



Finally there is yet the hydroecial aperture B (textfig. 44) which 

 is three-sided (ridges /, /, i). 



In the paired facets we could think again of the conjunction of 

 some facets; /, / of F, G, H and F', G', H' together (textfig. 45). 



The superior lateral ridge is ridge r and posteriorly ridge / which 

 belongs to the hydroecium. Anteriorly we find ridge /' of facet E, on the 

 basal side ridge h of facet A. Between ridge k and r is the posterior 

 side of yet another ridge .t which ends quite suddenly, a little before 

 touching the point of ridge Ji. This abrupt cessation of the ridge could 

 be found clearly in all eight superior nectophores. This ridge might be 

 the same as f. i. ridges / and ;;/ in Abyla trigona. Ridge n has apparently 

 disappeared. 



As the superior nectophore is ever so much longer than broad, 

 somatocyst, nectosac and hydroecium are also elongated. The somatocyst 

 is broadest under ridge .t (PI. V, fig. 44 .?(?/;/.); in the dorsal wall it pos- 

 sesses very big glandular cells. In the apex it gives oft' a small canal to 

 the stem. 



The nectosac (PI. V, fig. 44 n.sac) has an elongated, cylindrical 

 tube-shape ; a short, thread-like canal goes oft" from the stem to the apex 

 of the nectosac, divides itself into four canals, whose course is a lateral 

 one ; they all end in a circular canal, each of them yet showing a small 

 enlargement. 



Of stem and appendages we can tell no more than Huxlev and 

 Agassiz and Mayer could. We found some siphons with clustered tentacle 

 and tentilla and groups of young appendages, but we could 

 not find any group sufficiently developed to give an idea of 

 the shape of the future Eudoxid. 



As is said above there were no loose inferior nectophores. 



41. 



ik 



h) 1^ 



43. 



44. f 



Figg. 41 — 45. Abyla Lettckarti Huxl. 



The facets of the superior nectophore. 



Fig. 41: facet A, Fig. 42: facet E, 



Fig. 43 : facets D, CII, CI combined, 



Fig. 44: Aperture of the hydroecial cavity 13, 



Fig. 45: facets F, G, H, (F', G', H') combined. 



Figg. 41—45: X 5- 



