PLATE XXIII. 



The figures of this Plate were drawn by me from living specimens in the Canary Island Lanzerote, 



December 26, 1S66. 



Nectophysa wyvillei, n. sp. (p. 327). 



Fig.f 1. A complete eorm, in the expanded state, quietly floating on the surface. 

 p, Pneumatophore ; po, its apical stigma ; pv, hypocystic villi ; a, 

 trunk : s, siphons ; t, tentacles ; ga, gonodendra, 



Fig. 2. A complete larger conn, in the expanded state, with twisted trunk, 

 reposing on the bottom of the glass vessel. The suctorial mouth- 

 discs of the lower siphons are attached to the wall of the vessel. 

 Characters as in fig. 1, 



Fig. 3. A complete corm (the same as fig. l) in the contracted state, with 

 shortened and thickened trunk, coiled up in a dexiotropic spiral. An 

 air-bubble (x) is being expelled through the apical stigma (po) of 

 the pneumatophore; pf, pneumatocyst ; pp, pigment-cap (mitra 

 ocellaris) ; pv, hypocystic villi, ..... 



Diam. 



nat. size 



nat. size 



Fig. 4. 



Fig- 5. 



Fig- 6. 



Fig. 7. 



Fig. 8. 



Uppermost portion of the fully contracted trunk. The pneumatocyst 

 ( pf) is nearly evacuated and the greatest part of the gas expelled 

 through the apical stigma (po). The hypocystic villi (pv) are 

 thrown into the vesicular inflated apical portion of the trunk («) 

 i, buds ; ga, gonodendra ; s, siphons, 



A single siphon, with its tentacle (t) attached to the trunk (at) ; ts 

 tentilla, ....... 



A small portion of a tentillum. he, Cnidocysts ; tw, palpoblasts, 



A single cnidocyst with the included cnidofilament, 



A single branch of a gonodendron. gq, Gonopalpon ; h, androphores 

 lix, spadix ; lis, spcrma; /, gynophore; fin, its rudimentary manu 

 brium; mv, subumbrellar cavity, .... 



x 10 



x 20 



x 300 



x 900 



x 50 



