74 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 47. 



Our species resembles also S. lafondii Hombron and Jacquinot/ 

 which has a similar ornamentation on the upper margin of the palm, 

 no ridge inside the palm, but the upper margin of the movable 

 finger entirely smooth; in this last character, S. palawanense is 

 intermediate between tseniolatum and lafondii. The latter has an 

 even broader carapace than tseniolatum, and its side margins are 

 parallel instead of convergent. 



SESARMA (SESARMA) VICENTENSE, new species. 



Type-locality. — Port San Vicente (Luzon side), Palaui Island, off 

 northern Luzon; beach; Nov. 15, 1908; 1 male. 



Type.— Cat. No. 45758, U.S.N.M. 



Dimensions. — Male, length 8.8 mm., width at orbital angles 9.2 mm., 

 posterior or greatest width 9.7 mm., width of front 4.6 mm. 



A small, square species with 3-toothed side margins and a vertical 

 front. Carapace a little wider than long, sides nearly parallel but 

 slightly diverging posteriorly, and a little concave behind the third 

 tooth; dorsal surface almost flat, except near the front and postero- 

 lateral corners; regions delimited, surface roughened with crowded 

 flattened granules anteriorly and with confluent grooves and pits 

 posteriorly; on the hepatic and anterior branchial regions there are 

 also unequal bead-granules. Suprafrontal lobes nearly transverse, 

 separated by very small emarginations, the lobes of the inner pair a 

 little more than one and one-half times as vnde as those of the outer 

 pair; from these lobes the front descends abruptly, lower margin 

 horizontal, sinuous with two broad, shallow lobes and an equally 

 broad median sinus; sides of front parallel, lower corners rounded, 

 surface finely granulous, a tubercle on each side near the lower 

 margin almost in fine mth the notch between the outer and inner 

 postfrontal lobes. 



Upper margin of orbit inclined obliquely backward and outward 

 to the acutangled antero-lateral tooth; tliis is separated by a well- 

 marked notch from the second tooth which is small and obtusangled; 

 the third tooth is simply a smooth swelling of the margin. 



Epistome covered with vesicular pubescence. Merus of outer 

 maxillipeds equal m length to the ischium, its antero-lateral angles 

 rounded off. 



Only the left cheliped is present and that is rather small, not one 

 and one-half times as long as the carapace. Lower and inner margins 

 of merus denticulate, outer surface covered with short rugae, upper 

 margin formed by parallel, oblique rugae. Upper surface of carpus 

 crossed by granulated rugae, inner angle bluntly rounded. Outer 

 surface of hand nearly smooth, punctate, upper surface covered with 

 sharp granules, and near the margin, with obliquely longitudmal and 



> Voy. V Astrolabe, Atlas of Zoology, Crustacea, 1852 (?), pi. 6, figs. 4 and D. 



