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Show 1902.] CRUSTACEA OF THE " SKEAT EXPEDITION." 371 Mouth : labrum with 2 teeth on each side of the central notch mandible with 4 large teeth, of which the first is sharper than, and distant from, the others, and 3 small teeth, of which two are situated at the bases of the 3rd and 4th larger teeth respectively, while the third is close to the lower angle; maxillse with a straight edge and 7 teeth, of which the two upper and the two lower are a little longer than the others. XI. Genus C h e lo n o b ia Leach. 24. C h e lo n o b ia t e s t u d in a r ia . Lepas testudinaria Linn. Syst. Nat. (1767). Chelonobia testudinaria Darwin, ‘ Balanidse,' p. 392, pi xiv fig. 1 (1854). 1 Loc. Kota Bliaru, Kelantan. Nine specimens. XII. Genus P l a t y l e p a s Gray. 25. P l a t y l e p a s o p h io p h il u s , sp. nov. (P la te XXXV. figs. 5-5 b.) % Platylepas------ ? Darwin, ‘ Balanidse,' p. 430 (1854). Loc. ------ ? Hab. Embedded, not very deeply, in the skin of the sea-snake, Enhydris curtus. Shell depressed, orifice large and ovoid. Parietes, probably aporous, externally marked with longitudinal ribs which are crossed by transverse grooves, at least in the upper half, giving rise to a beaded appearance; in the lower half the ribs are less obviously broken into beads and project beyond the lower line of the compartment, to the number of three or four on each side of the midrib; they are, however, more pointed than, and not nearly so prominent as, the latter. The midribs of the rostrum and carina are a little shorter than those of the lateral compartments. Internally, the longitudinal ribs are visible in the lower half of the compartment, but in the upper half the shell has thickened considerably, growing inwards nearly to the level of the inner edge of the midrib. Basis only moderately convex. Scuta with the rostral ends narrower than the tergal^ rounded, and the outer margins lightly concave; the rostral ends not curved inwards. Terga with the outer margins strongly convex towards the carinal end, these ends being truncate and bent inwards, so as to lie with their margins nearly parallel; scutal ends a little broader than the carinal. The mouth-parts conform to the characters of the genus and present no specific differences. The rami of the 1st cirri are unequal, but not very much so, the inner exceeding the outer only by its last joint. The penis is long, in one instance twice as long as the whole body from the anterior end of the prosoma to the origin of the penis itself; it gradually tapers to its bluntly truncate apex, the terminal half only with a few scattered, 1 24* |