652 Bett—On the Echinoderm Fauna of the Island of Ceylon. 
39. ECHINODISCUS BIFORIS. 
Echinodiscus bisperforatus. Leske, Addit., p. 132. 
Echinus biforis. Gmelin, Syst. Nat., xiii., p. 3188. 
The term Jiforis can only be preferred to Leske’s clumsy epithet on the ground 
of long and general usage. 
40. ECHINONEUS CYCLOSTOMUS. 
Echinoneus cyclostomus. Leske, Addit., p. 173 ; Agassiz, Rev. Ech., p. 117. 
41. ECHINOLAMPAS OVIFORMIS. 
Echinus oviformis. Gmelin, p. 3187. 
Echinolampas oviformis. Gray, Annals Philos., xxvi. (n. s. x.), p. 429. 
I include this species in the list of Echinoderms on the strength of M. de 
Loriol’s determination (Mem. Soc. Phys. Gentve, xxiv., p. 665) of a specimen 
~ collected by M. Humbert in Ceylon, and now in the Geneva Museum; there is no 
specimen from Ceylon in the British Museum, and Mr. A. Agassiz’s statement 
to that effect must be based on some misunderstanding. 
42, MARETIA ALTA. 
Maretia alta. A. Agassiz, Proc. Acad. Nat. Hist., Philadelphia, 1863, p. 360 ; 
Rey. Kch., p. 189. 
V. HOLOTHURIOIDEA. 
43. SYNAPTA BESELII. 
Synapta beselii. Jaeger, De Holothuriis, p. 15, pl. i.; Semper, Holothurien, 
p. 11, pl. i.; Lampert, p. 223; Théel, p. 19. 
This must be one of the most conspicuous members of the littoral Fauna of 
Ceylon. Dr. Ondaatje has forwarded to me two beautiful figures of the species; but 
as it has been already well figured by Semper, there is no need to repeat it here. 
Of great size, as much as seven feet in length, with its fifteen bright yellow 
tentacles, and its regular rows of prominent wart-like tubercles, it must frequently 
attract the eye. 
44, SyNAPTA GRISEA. 
Synapta grisea. Semper, Holothurien, p. 11; Lampert, p. 219; Théel, p. 21. 
Of this smaller species there is, unfortunately, no figure. 
