Zoological results of a tour in the Far East . s. Leiden, III, p. 164, pi. xv (1917). 238 ZOOLOGY OF THE FAR EAST. S. siamense was described by Miss Rathbun from the eastern side of the Gulf ofSiam, from Koh Kong, Koh Kut and Koh Chick. Scsarma foxi, sp. take this opportunity of describing a very interesting species of Sesarma ob-tained in 1914 by Mr. B. H. Buxton at a height of 2000 ft. on Gunong Raya, in LangkawiI., N. of Penang. Species of this typically estuarine genus have seldom been recordedfrom considerable altitudes, though a number have been taken on land some distancefrom the
Zoological results of a tour in the Far East . s. Leiden, III, p. 164, pi. xv (1917). 238 ZOOLOGY OF THE FAR EAST. S. siamense was described by Miss Rathbun from the eastern side of the Gulf ofSiam, from Koh Kong, Koh Kut and Koh Chick. Scsarma foxi, sp. take this opportunity of describing a very interesting species of Sesarma ob-tained in 1914 by Mr. B. H. Buxton at a height of 2000 ft. on Gunong Raya, in LangkawiI., N. of Penang. Species of this typically estuarine genus have seldom been recordedfrom considerable altitudes, though a number have been taken on land some distancefrom the coast-line. The following list, so far as I am aware, comprises all species ofthe gentis that have been recorded from definite heights above maculata, de Man. Halmahera, 2000 maculata, Lanchester ( ? de Man). Bukit Besar, near Patani, Siamese Malay States, 2500 and 3500 trapezoidea, Guérin. Halmahera, 2500 thelxinoe, de Man. Andamans, 800 sp. (vide infra, p. 240). Penang, 1200 Fig. 3.—Sesarma foxi, sp. nov. It appears probable that in these places the Sesarma have been able to adopt astrictly terrestrial mode of life and to ascend to considerable altitudes owing to thedamp climate that prevails ; in the Andamans the entire absence of competitors inthe form of Potamonidae is doubtless an important factor. The carapace in S. foxi is exactly quadrilateral, its length being precisely, or al-most precisely, equal to its breadth ; the lateral margins are strictly parallel, thebreadth at the base of the third pair of legs being equal to that at the outer orbital carapace is shghtly convex fore and aft and from side to side and is everywheredistinctly rugose and faintly pitted. A trifoliate gastric areola is distinct and behind itthere is a slight prominence on the cardiac region ; these areas are a little smoother Crustacea Decapoda and Stomatopoda. 239 than the rest of the carapace. The front is abruptly
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