1902.] CRUSTACEA OF THE "SKEAT EXPEDITIOX." 371 



Mouth : labrum with 2 teeth on each side of the central notch ; 

 mandible with 4 lai-ge 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 ; maxillje 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 Chelonobia Leach. 



24. Chelonobia testudinaria. 



Lepas tesUtdinaria Linn. Syst. Nat. (1767). 

 Chelonohia testudinaria Darwin, ' Balanidfe,' p. 392, pi. xiv. 

 fig. 1 (1854). 



Log. Kota Bharu, Kelantan. Nine specimens. 



XII. Genus Platylepas Gray. 



25. Platylepas ophiophilus, sp. nov. (Plate XXXV. figs. 

 5-5 h.) 



'i Platylepas ? Darwin, ' Balanidae,' p. 430 (1854). 



Log. ? 



Hah. Embedded, not very deeply, in the skin of the sea-snake, 

 Enhydris Gurtus. 



Shell depressed, orifice large and ovoid. 



Parietes, i:)robably 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 carina! 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 difierences. 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, 



24* 



