292 ME. F. P. BEDFORD ON MALAYAN ECHINODEItMS. [Mar. 20, 



4. Astkopecten plei ACANTHUS, sp. nov. (Plate XXIY. 

 figs. 9 a, b, c.) 



Locality. Two specimens in 1 to 3 fathoms on mud on the 

 east side of Singapore Islaud. 



This species belongs to the division of the genus in which there 

 are two series of spines on the superomarginals (Mailer & 

 Troschel's classification) : the inner series is most strongly developed 

 at the interbrachial angle and only extends a short distance along 

 the arms ; while the outer series disappears at their base, as in 

 A. aurantiacus, A. brevispinus, and some S. American species. 

 The adambulacral armature is triplacanthid ; there are three 

 furrow-spines, of which the middle is the longest ; outside these 

 on each plate there are two spines, of which the aboral is much 

 larger than the adoral ; the outer row is irregular, being usually 

 composed of one or two small spines. The marginals are all 

 covered with closely packed scale-like spinelets, the inferomarginals 

 being provided in addition with several larger spines, which are not 

 arranged in a single transverse row, but are situated somewhat 

 irregularly, the abactinal lateral spine being the longest and most 

 robust ; paxillar crowns are very large and oval, with about 15 

 peripheral and 5 or 6 central spines, reminding one of A. zebra or 

 A. polyacanthus. 



This species is undoubtedly very closely allied to the Mediterra- 

 nean species A. cmrantiacvs ; its supermarginal spines are less 

 prominent, the lateral spines are longer and narrower, the paxilli 

 are provided with a larger crown, and the adambulacral armature 

 is slightly different; in many respects also it is extremely like 

 A. pohj acanthus, from which it is, however, at once distinguished 

 by the presence of bispinose superoinarginals. 



No. of 

 li. r. Arm-breadth. marginals. 



51 12 14-5 27-30 



32 9 11 24 



5. LUIDIA LONGISPINA. 



Luidia longispinis, W. P. Sladen, ' Challenger ' Reports, xxx. 

 Asteroidea, 1889, p. 254, pis. 43 & 45. 



R = 5-75 x r. 



Locality. Two specimens dredged off Singapore in 1 0-1 5 fathom - 

 on gravel in association with Gorgonians, &c. 



R. r. Arm-breadth. 



23 4 4-5 



6. Luidia penangensis. 



Luidia penangensis, de Loriol, Mem. Soc. Phys. &c. de Geneve, 

 suppl. vol. 1891, p. 25, pi. hi. fig. 2. 



Locality. This species is very abundant oft' Malacca on mud in 

 2 to 10 fathoms of water, and reaches a much more considerable 



