22 
THE VOYAGE OF H.M.S. CHALLENGEE. 
7 . A single madreporic canal. 
Synapta godeffroyi, Semper, 1868. 
Tentacles fourteen to sixteen. Digits of the tentacles united by a web. Numerous 
Polian vesicles. Anchor-arms smooth. Anchor-plates with seven large dentate 
holes, and two large and several minute smooth holes at the handle ; the seventh 
hole only partly dentate. _ Anchors often deformed. Miliary granules — ^rosettes. 
Habitat . — Navigator Islands (Semper), Mauritius (Haacke, Ludwig). 
(Mus. Holm.) One individual 310 mm. long obtained at the Pelew Islands. 
Tentacles fourteen, with the numerous sriiall digits, as it seems, united by a thin 
web. Colour light yellowish or whitish-grey, with a darker line along each of 
the dorsal ambulacra, and with scattered rather large spots of a greenish-brown 
colour on the three dorsal interambulacra. Eosette-shaped granules numerous. 
Cartilaginous ring absent. Deposits and inner organisation fully agreeing with 
Semper’s description. 
Synapta polii, Ludwig, 1875. 
Digits of the tentacles, about sixty, free. Numerous Polian vesicles. Anchor-arms 
smooth. Anchor-plates with six large dentate holes, and three large and some 
minute smooth holes. Miliary granules — rosettes. 
Habitat. — Barbados (Ludwig). 
This species must be very nearly allied, if not identical, to Muller’s Synapta lappa. 
The following species, probably belonging to the same group of Synaptse, are unsatis- 
factorily known and need to be re-examined : — 
Synapta hifaria, Semper, 1868. Synapta sp., Herapath, 1865, 
Tentacles in two crowns, those in the exterior digitate or pinnate, those in the inner, 
on the contrary, simple unhranched. 
Habitat. — Belfast in Ireland (Herapath). 
Synapta radiosa {Holotliuria) , Reynaud, Lesson, 1830; Jaeger, 1833 ; J. Muller, 1854. 
ReynaudiaiJ) radiosa, Brandt, 1835. 
Very incompletely described. Probably identical with Synapta beselii. 
t Habitat. — Coromandel, at the Bay of Bengal (Lesson). 
Synapta tentaculata {Holotliui'ia) , Forster, Blainville, 1821 ; Semper, 1868. 
Pentacta tentaculata, Jaeger, 1833. Cucumaria tentacidata, Blainville, 1834. 
Oncinolahes forsteri, Bnandt, 1835. 
Very incomplete description. Probably nearly related to the group of Synapta beselii. 
Habitat. — Eogit, Massachusetts (Blainville and Forster). 
