130 TUBTJLARIID^. 



2. C. NANA, Alder. 



HYDRACTINIA, Johnston, B. Z. 463, woodcut, fig. 79 a. 



? (Alderi) Gray, Cat. Brit. Mus. Eadiata, 61. 



CORYMORPHA NANA, Alder, North, and Durh. Cat. Trans. Tynes. F. C. iii. 108, 

 pi. ix. fig. 7, 8 ; Supplem. Trans. Tynes. F. C. v. 233, pi. xi. 



Plate XXII. fig. 3. 



STEM elongated, subcylindrical, transparent, white or yel- 

 lowish, with opake ivhite lines, bearing towards the lower 

 part of it a number of extensile tubular processes ; poly- 

 pary a transparent filmy sheath, ending at the base in a 

 gelatinous mass (?) by 'which the animal is att ache d ; POLY- 

 PITES yellowish ; oral tentacles about 16-18 in two imper- 

 fect rows, aboral tentacles 15-20. 



GONOZOOID naked, sessile, urn- or bell-shaped ; UMBRELLA 

 (at the time of liberation) rather deep, semiglobose, 

 transparent white ; MANUBRITJM rather long and thick ; 

 RADIATING CANALS yellowish, three of them ending in a 

 yellow bulb on the margin, the fourth produced into a 

 club-shaped (?) tentacle. 



Height of zoophyte | to f inch. 



" COKYMORPHA NANA is a very active animal, constantly 

 changing its form and the proportions of its parts. * * * 

 In many of its states it bears a considerable resemblance 

 to C. nutans, from which, however, it differs, not only in 

 the diminutive size, but in the gonophores being sessile 

 (not pedunculated or branched as in the latter), and large 

 in proportion to the size of the animal. The medusoicl 

 differs from that of C. nutans in having the umbrella 

 rounded at the top ; in other respects it is very similar." 

 (Alder.} Alder seems to have described the single tentacle 

 of the gonozooid when in a contracted condition. It pro- 

 bably resembles in structure that of C. nutans. 



He states that this species produces dissimilar repro- 

 ductive bodies. On one polypite they were developed into 



