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Show 284 MR. F. P. BEDFORD ON MALAYAN ECHINODERMS. [Mar. 20, p. 518. P. de Loricl, Mem. Soc. Phys. &c de Geneve, t. xxviii. no. 8, 1883, p. 37. C. Ph. Sluiter, Natuurk. Tijd. v. Ned. Ind. xlviii. 1889, p. 293. P. de Loriol, Rev. Suisse de Zool. t. i. 1893, p. 375. Locality Sf Habitat. Abundant in 5 to 10 fathoms on mud. Singapore. Distribution. Extends from the East Coast of Africa to Fiji and Kingsmills Is. Adults are easi'y distinguished from L. decagonale by the shape of the test; the young, however, approach each other rather closely (v. figs.) ; 5 genital pores usually visible. 1. 2. 3. 4. 5. .Nt Measurements. Length 37 mm. „ 37 „ 36-5 „ 36 „ 36 M DECAGONALE de Diameter 33 mm ii ii ii ii Blainv. 33 31 32 31-5 10. L A G A N U M DECAGONALE de Blainv. ((PPllaattee XXIII. figs. 6 a-e.) Laganum decagonum, L. Agassiz, Monogr. d'Echinod. ii. 1841, p. 112, tab. 23. figs. 16-20. References. Alexander Agassiz, Revision of Echini, pt. 3, 1873, p. 520. F. J. Bell, Zool. Coll. of H.M.S. ' Alert,' 1884, p. 122. F. J. Bell, Ann. & Mag. Nat. Hist. ser. 5, vol. xi. 1884, p. 130. F. J. Bell, Proc. Zool. Soc. 1894, p. 411. Locality Sc Habitat. Very abundant in 3 to 10 fathoms on mud. Singapore and Malacca. Distribution. Previously recorded from Japan, Prince of Wales' Channel and Thursday Is., N e w Caledonia, and Bay of Bengal. The colour, when alive, is a dull red ; in spirit this first becomes green, and ultimately disappears more or less completely. As shown in the figures, the test is somewhat variable in shape, the angles of the outline being somewhat less marked in young individuals. The size of the genital openings varies considerably ; normally there are four present, although occasionally the posterior pore also occurs : in some specimens the genital openings are quite indistinguishable even in the denuded test; the extent to which the coronal sutures are visible is also extremely variable. This species is placed by Agassiz and others in the subgenus Peronella, but Professor Bell (loc. cit. 1883) has shown reasons for discontinuing this mode of subdivision of the genus. Measurements. 1. Length 66-5 mm. Diameter 63-5 mm. 2- „ 57 „ 51 3. „ 54 „ 49-5 |
