890 MH. F. P. BEDFOBB ON MALAYAN ECHINODEHMB. [Mar. 20, 



superomarginals meet across tlie abactinal surface, but the actinal 

 plates are unaffected. 



The anus is central, without any tendency towards Cuenot's 

 interradius BC in any of the five specimens brought back : Prof. 

 Ludwig, in his definition of the genus Archaster, says, " After 

 central'' (loc. cit. p. 667); whereas in the body of the work 

 (p. 587) he corroborates Cuenot by stating that it lies " stets mehr 

 oder weniger excentrisch in der Biohtung einer interradialen 

 Hauptebene," and he then continues to describe the particular 

 interradius in agreement with Cuenot's notation EC. although he 

 adopts a somewhat different mode of orientation. 



Measurements of two extreme individuals : — 



2. Ceaspidasteb glauconotus, sp. nov. (Plate XXIV. 

 figs. 8 a, b.) 



References. W. P. Sladen, ' Challenger ' Eeports, xxx. Asteroidea, 

 1889. H. Ludwig, Bronn's Thier-Eeich, Bd. ii. Abth. 3, 

 Buch 2, 1899. A. E. Verrill, Trans. Connect. Ac. vol. x. 

 pt. 1, 1889, p. 213. 



R=5Xr. 



Locality. Several specimens from 1 to 3 fathoms, Malacca. 



Marginal plates very robust, superomarginals devoid of spines, 

 granular; inieromarginals also granular with a variable number 

 of spinelets ; in some specimens there are two complete rows of 

 3 to 5 spinelets in each row on each plate, the abactinal ones 

 being larger than the rest, but not standing out as a conspicuous 

 fringe as they do in most Astropecten ; in other specimens fewer 

 spines are developed, in a few cases only one or two extra spinelets 

 occurring in addition to those on the lateral line ; the ventro- 

 laterals also carry each several spinelets ; as in Craspidaster 

 hesprrus, the ventrolaterals are few in number, not extending 

 beyond the fourth inferomarginal. The abactinal surface is 

 paxillose, each paxillus having a circular crown of about eight 

 papillae, the centre being usually smooth ; as in C. hesperus, the 

 plates are covered with a membrane which forms a serrated fringe 

 on the edges of the marginals and dorsoventrals ; superambulacrals 

 are present between the ambulacrals and inferomarginals ; the 

 tube-feet are conical, without any sucking-disc ; adambulacral 

 annature is diplacanthid, arching over the furrow is a comb of 

 six subequal spines, outside this on the aboral part of the ventral 

 surface is a single rather stout spine, and on each of the three re- 

 maining edges of each plate is a vertical row of 3 to 5 rather short 

 spines. Madreporite is small and circular, situated about halfway 

 from outer edge to centre. In the youngest specimen obtained 

 the spiculation of the ventrolaterals is already developed. 



