PLATE XXXVIII. 



Sphenoides obeliscus, n. sp. (p. 116). 



(Monogastric generation or free Eudoxia of Bassia obeliscus, PI. XXXVII.) 



Fig. 12. A complete Eudoxia, attached to the stem (a) of the polygastric generation, 

 Bassia obeliscus, seen from the left side. The bilateral bract (u) is beset 

 with scattered groups of cnidocysts, and exhibits twelve prominent pyra- 

 midal teeth (characters n^-u 12 as in fig. 13). Its large phyllocyst contains 

 an apical oleocyst (co). The siphon (s) is placed between the dorsal tentacle 

 (t) and the ventral male gonophore (h). The numerous tentilla (tk) are 

 partly expanded (below), partly coiled up (above). 



Fig. 13. Bract of a young sessile Eudoxia, attached to the stem (a), seen from the right 

 side. The twelve prominent three-sided pyramidal teeth have denticulate 

 edges and the following names : — u 1 , odd ventral apical tooth ; ir, u?, ventro- 

 lateral apical teeth ; u 4 , u h , ventro-lateral basal teeth ; u n , u', dorso-lateral 

 basal teeth ; u B , odd dorsal basal tooth ; u 9 , odd dorsal cristal tooth ; u w , u n , 

 dorso-lateral teeth ; u 1 ' 2 , odd dorsal apical tooth, bh, Cavity of the bract ; %v, 

 its subumbrellar wall ; be, phyllocyst ; cd, its basal caecum (dorsal canal) ; co, 

 oleocyst. 



Fig. 14. Bract of an adult free Eudoxia, seen from the right side. Characters as in 

 figs. 12 and 13. 



Fig. 15. An isolated female gonophore. cp, Peduncular canal; gp, pedicle of the 

 umbrella ; o, ovarium ; w, subumbrella ; cr, radial canals ; cc, circular canal. 



Fig. 16. A single tentillum. ts, Pedicle; kg, large basal cnidocysts; km, small 

 median cnidocysts ; kp, pyriform distal cnidocysts ; if, terminal filament. 



