216 ABYLA LEUCKARTII. 



b'. Anterior nectophore with simple ventral facet, contracted near 



the middle. 



A. trigona. 

 c. Anterior nectophore with the ventral facet divided into two by a 

 transverse ridge. 



A. haeckeli. 



2. Anterior nectophore without apical facet, the lateral facets on the two sides 

 meeting at apex in a ridge. Posterior nectophore with both dorsal and 

 lateral ridges well developed. Its hydroecium open. 



Abylopsis. 



a. Basal portion of posterior nectophore strongly asymmetrical; 

 the canals of its nectosac with basal dilations, and following an 

 aberrant course (Plate 14, fig. 7). 

 A. tetragona. 

 h. Basal portion of posterior nectophore subsymmetrical ; canals of 

 its nectosac of ordinary type. 

 A. eschscholtzii. 



3. Anterior nectophore as in Abylopsis; posterior nectophore with dorsal ridge 

 entirely absent; its hydroecium a closed tube. Bract of "Sphenoides" 

 type. 



Bassia 



B. bassensis. 



4. Anterior nectophore pyramidal; pointed apically: resembling externally 

 the Diphyids; its facets agreeing in their essentials with those of A. leuckartii. 

 Nectosac reaching high above the level of its pedicular canal. 



DiPHYABYLA. 



Diphyabyla hubrechti. 



ABYLA QnoY and Gaimard, 1827. 

 Abyla leuckartii Huxley. 



Plate 1.3, fig, 5-8; Plate 15, fig. 3, 4 Eudoxid. 



Abyla leuckartii Huxley, '59, p. 49, pi. 3, fig. 2; Agassiz and INIayer, :02, p. 165 (partim); Lens and 



Van Riemsdijk, : 08, p. 34, pi. 5, fig. 42-46. 

 Enneagonum leuckarlii Schneider, '98, p. 93. 

 ? Ahyla trigona Chun, '97b, p. 31 (partim). 



Station 4592 surface 1 anterior nectophore. 



" 4661 " " " 



" 4667 300 fathoms to " " " 



