562 P, CHALMERS MITCHELL. 
careous matter, gave rise to the corals. Among the many incom- 
pletely investigated forms grouped under Andres’ Stichodac- 
tylinee, immediate allies of the Thelaceride will probably be 
found ; and attention may well be directed to the Discosomide, 
with their abnormal radially arranged tentacles and unre- 
tractile disc; and the Cryptodendride, also with abnormal 
tentacles and unretractile disc. These are both littoral forms, 
and may stand on either side the Thelaceride. 
LITERATURE REFERRED TO. 
Attman.—* A New Genus of Helianthoid zooid,” ‘Aun. Mag. Nat. Hist.,’ 
1846, p. 417. 
Anpres, A.—‘ Le Attinie,” ‘Fauna und Flora des Golfes von Neapel,’ 
Monograph ix. 
Gossz.—‘ History of British Sea Anemones,’ London, Van Voorst, 1860. 
Harckeu.—‘ Arabische Korallen,’ Berlin, 1875. 
(1) Herrwie, O. and R.—* Die Actinien anatomisch und histologisch unter- 
sucht,” ‘Jena Zeit.,’ xiv, 1880; ‘Studien zu Blatter-Theorie I,’ 
Jena 1879. 
(2) Hertwie, R.—“ Actiniaria,” ‘Challenger Report,’ vol. vi. 
(3) Herrwic, R.—* Actiniaria,” Supplement ‘ Challenger Report,’ vol. xxvi. 
Hickson, 8S. J.—* A Naturalist in N. Celebes,’ Murray, 1889. 
Ktiinzicrr.—‘ Die Korallthiere des Rothen Meeres,’ Berlin, 1877. 
VeRnitL.— Proc. Essex Instit.,’ vi, p.67; ‘Trans. Connect. Acad.,’ i, p. 461. 
