PLATE XX. 



Discolabe quadrigata, n. sp. (p. 263). 



Figs. 9-13. Different views of the vesicular trunk, after detachment of the necto- 

 phores, palpons, siphons, and tentacles, p, Pneumatophore ; pp, pigment- 

 cap (mitra ocellaris) ; pr, radial septa between the eight pouches of the 

 pericystic cavity ; an, spindle-shaped trunk of the nectosome ; np, con- 

 voluted longitudinal fold on its ventral median line, where the pedicles of 

 the nectophores have been attached ; in, buds of nectophores ; as, discoidal 

 trunk of the siphosome, spirally twisted in the form of a subcircular inflated 

 bag ; af, quadrangular facettes on the peripheral margin of the trunk of 

 the siphosome, each facette corresponding to the insertion of a large 

 palpon, and the small opening in its centre (cq) to the small canal which 

 connects the cavities of the palpon and of the vesicular trunk. Attached 

 to the inferior margin of each facette are two distylic clustered gono- 

 dendra ; a larger proximal female cluster (/), composed of very numerous 

 ovate gynophores ; and a smaller distal male cluster (h) with a single large 

 spindle-shaped gonopalpon (gp). The pedicles of the detached siphons are 

 visible in the basal view (fig. 12, sp). 



Fig. 9. Apical view of the trunk (from above). 

 Fig. 10. Lateral view of the trunk (from the left side). 

 Fig. 11. Ventral view of the trunk (from before^. 

 Fig. 12. Basal view of the trunk (from below). 



Fig. 13. Ventral view of a smaller trunk. A single siphon (s) and tentacle (t) have re- 

 mained in this younger specimen attached to the stem. 



Fig. 14. A single tentillum. tp, Distal portion of the inflated pedicle ; th, vesicular 

 involucre ; ty, ocellus in its wall ; th, spiral cnidoband. 



Fig. 15. Apical view of the nectosome, exhibiting the cruciform arrangement of the 

 four rows of nectophores (n) around the central pneumatocyst ( p). 



Fig. 16. A single complete cormidium, in the usual natural position of its component 

 organs. q, Palpon (horizontal) ; af, facette of the trunk where the 

 proximal base of the palpon is inserted ; cp, canal of the palpon in the 

 centre of the facette ; r, palpacle ; gf, clustered female gonodendron ; 

 gh, smaller male gonodendron ; gq, its large gonopalpon ; fop, insertions of 

 pedicles of detached androphores ; s, siphon (vertical) ; so, its distal mouth ; 

 t, tentacle ; ts, tentilla ; hs, cnidosacs. 



