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Show 752 MR. W. F. LANCHESTER ON CRUSTACEANS [June 19, Ocypode ceratophthalma, Fabr. Suppl. Ent. Syst. p. 347 (1798). Ocypoda ceratophthalma, M.-Edw. Hist. Nat. Crust, t. ii. p. 48 (1837); Hasw. Cat. Austr. Crust, p. 94 (1882); Walker, Journ. Linn. Soc, Zool. vol. xx. p. 110 (1887) ; de Man, Mergui Crust. p. 107 (1888) ; Hend. Trans. Linn. Soc, Zool. vol. v. p. 387 (1893). Ocypode ceratophthalma, de Man, Zoolog. Jahrb. Bd. viii. p. 570 (1895). Hab. Singapore and Malacca: in holes in the dry sand, above the mean high-water mark. These holes are not more than a foot to a foot and a half in depth, with at least one more or less sharp turn in them : they are only covered at the highest spring tides, at least in the great majority of cases. Five males and two females, all adult, about 35-40 mm. in length : seven males and a female, ranging from 5-20 mm. The individual 20 mm. long shows the first trace of ocular styles in the shape of tubercles barely a millimetre in length (cf. de Man, Zoolog. Jahrb. 1. c) ; that next in size, 13 mm. long, shows no trace of them. Close to the distal extremity of the eyestalk, in the young specimens, may be seen a small hair: and a little farther back a similar hair, just where the stalk is left uncovered by the cornea. In the adult this second hair retains its position, but the first is carried farther and farther away, as the ocular style increases in length. These two hairs may equally be seen in 0. cordimana, but with numerous smaller hairs interspersed between and around them. In four of the smallest specimens the epibranchial angles attain the same level as the external orbital angle, the margin between being straight or concave: in tbe other two it projects farther than the orbital angle, the margin between being concave just behind the latter angle, but becoming convex towards the epibranchial. In the individual of 13 mm. length it is much more prominent than the orbital, and forms a sharp angle: the antero-lateral margin is straight. In the adults the two angles are approximately on the same level, with the margin between slightly concave. Dim. d 41-5x36-5. d 41x37. d 40-5x36-5. d 35x31-75 d 32-5x29. d 23x20. $ 40-75x36-5. $ 37-5x34-5 $ 35x31. Breadth taken from epibranchial angles. 73. OCYPODE CORDIMANA Latr. Ocypoda cordimana (Latr.) M.-Edw. Hist, Nat. Crust, t. ii. p. 45 (1837); de Man, Notes Leyden Mus. vol. iii. p. 248 (1881); id. Mergui Crust, p. 108 (1888); id. Zoolog. Jahrb. Bd. viii. p. 572 (1895); Henderson, Trans. Linn. Soc, Zool. vol. v. p. 387(1893). Hab. Singapore : holes like those of O. ceratophthalma. Two males and a female. Prof. Henderson (t. c) states that it is " terrestrial, and lives in burrows at some distance from the sea." These specimens came from holes which would sometimes be liable to be covered by the sea, though tbe strip of beach was not an open |
