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Show 1900.] MR. F. P. BEDFORD ON MALAYAN ECHINODERMS. 281 Measurements. 1- 2. 3. 4. 5. 6. 7. Diam. 24-5 26 34 35-5 10-5 34 37 Height. 15 15 21 21-5 7 21 21-5 Calyx. 8 7'5 Peristome. 8-0 7-5 100 100 4 100 100 Longest spine. 28-5 32 30 33 10 21 21 Locality. Malacca j> »> »» Singapore >> >> Percentage value D = 100. Longest spine. 1163 1231 88-2 92-9 95-2 61-8 56-8 5. TEMNOPLEURUS REYNAUDI Ag. (?). Temnopleurus reynaudi, Agassiz & Desor, Ann. Sc. Nat. (3) vi. 1846, p. 360. References. Alexander Agassiz, Revision of Echini, part 3, 1873. H. Farquhar, Proc. Linn. Soc. N. S. W . xxiii. 1898, p. 318. Distribution. Ceylon, China Seas, and New Zealand. Locality. A single specimen only, in 6 fathoms on a bottom composed of sandy mud off the west of Singapore Island, appears to beloug to this species. Diameter 24 mm.; height 13 mm. 6. SALMACIS SULCATA Ag. (Plate XXII. fig. 3.) Salmacis sulcata, Agassiz & Desor, Ann. Sc. Nat. (3) vi. 1846, p. 359. Salmacis globator, Alex. Agassiz (not L. Ag.), Revision of Echini, part 3, p. 473, 1872. Salmacis aiexandri, Bell, Report of Zool. Coll. H.M.S. ' Alert,' 1884, p. 119. References. J. E. Tenison-Woods, Proc. Linn. Soc. N. S. W . iv. 1878. F. J. Bell, Proc. Zool. Soc, 1880 (S. globator a). F. J. Bell, Proc. Linn. Soc. N. S. W . ix. 1885. S. Loven, Bih. K. Sv. Vet.-Ak. Handl. Bd. 13, Afd. 4, No. 5, 1887. L. Doederlein, Zool. Jahrb., Abth. Syst. Bd. 3, 1888, p. 836. P. M. Duncan & W . P. Sladen, Journ. Linn. Soc, Zool. xxi. 1888. H. Farquhar, Proc. Linn. Soc. N. S. W . xxiii. 1898. • Locality Sf Habitat, vide S. globator, Bell. I believe that this species prefers a somewhat greater depth than £. globator (5-10 fathoms), but in any case they are found together in about 5 fathoms. A similar association together of two closely allied species of Echinoids within a limited area occurs in the case of Echinus esculentus and Echinus acutus at Plymouth (v. E. J. Allen, Journ. M. B. A. Plymouth, vol.xv. no. 4,1889, p. 473). Iu this latter case the " specific centre " of the two forms appears, from Mr. Allen's |