ECHINODERMATA OF THE L.M.B.C. DISTRICT. 179 
It does not seem to be generally known that in the 
genera Astropecten and Lwidia, a pair of ‘‘ Tiedemann’s 
bodies”’ are present at the point of junction of the stone 
canal with the circum-oral water vessel, where in Asterias, 
Cribrella and Solaster there is but one. In Lwidia the 
members of each pair of these bodies are wider apart than 
in Astropecten. 
Luidia savigni, Audouin (sp.). 
Asterias savignii, Audouin; Savigny, ‘“‘Histoire de 
Egypte,” p. 11. (1809) ; description (1828), vol. xxiil., p. 9. 
Lwuidia fragilissima, Forbes, ‘“‘ Brit. Starfishes,” p. 135. 
1841. 
Imdia savignu, Muller and Troschel, ‘‘Syst. der 
Asteriden,”’ p. 77. 1842. 
Specimens of this fine Asterid were dredged from a 
depth of twenty fathoms between the Calf of Man and 
Port Erin Bay, on 20th May, 1888. The species had not 
previously been obtained by the committee. 
The pedicellariz of this species are well described by 
Rey. Canon A. M. Norman,* as ‘‘short, broad, and tumid— 
in fact, in the form of a nearly equilateral and equiangular 
triangle.’ Some few examples, however, nearly approach 
in form the same organs in Lwidia sarsvi, in which they 
are “‘much more elongated, narrow, and not tumid, and 
have the outline of a somewhat produced isosceles 
triangle.” The pedicellarize of Lada differ from those of 
other Asterids in being composed of three valves or blades. 
ECHINOIDEA. 
The recent additions to our list of Echinoderms do not 
include any Echinoidea. Of the species recorded in Prof. 
Herdman’s Report of 1886, I have twice taken Hchinus 
* «On the Genera and Species of British Echinodermata,” Ann. and Mag. 
Nat. Hist., 3rd series, vol. xv. 1865. 
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