29 



Merus 3,4-times as long as wide, carpus 2,9-times as long as thick at the distal extremity 

 that bears a movable spinule; propodus 5,3-times as long as wide, the lower margin with 

 ■6 spinules, long 0,12 mm., besides the two at the far end; dactylus a little more than Yi of 

 the propodus and 3-times as long as broad at base, agreeing with the figure 35 f (I.e.), but 

 the dorsal hook almost one and a half as long as the other. 



Relative dimensions of the 4.^^ leg: merus 1,76, carpus i, propodus 1,65-, dactylus 0,47 

 {measured from the proximal end of the anterior margin to the apex of the ventral hook). 

 Merus 3,4-times as long as wide, carpus 3-times as long as thick at the distal extremity, that 

 bears a movable spinule, propodus 5,1 -times as long as wide, with 5 spinules besides the two 

 at the far end ; dactylus a little more than '/^ of the propodus and 2,85-times as long as wide 

 at base, resembling that of the 3'''^ pair. 



Ova 0,7 — 0,8 mm. long. 



21. Synalpheus hastilicrasstis Cout. var. acanihiielsoni/onttis Ae.'^ldin. PI. Ill, fig. 14, i^a. 



Synalpheus hastilicrass'ts H. Coutiere, Alpheidae Maid, and Laccad. Archip., 1905, p. 875, 



PI. LXXII, fig. 12—12^/. 

 Synalpheus hastilicrassns J. G. de Man, Siboga Exp., Monogr. XXXIX «', Part II, Family 



Alpheidae, 191 1 (text) p. 263, 1915 (plates) PI. X, fig. 45 — 45(/. 

 Synalplifus hastilicrassns H. Cout., var. acanthitelsoniformis J, G. de Man, in: Zoolog. Meded. 



uitgeg. vanvvege 's Rijks Mus. v. Nat. Hist, te Leiden, 1920, Dl. V, Afl. 3, p. 108. 



Stat. 115. July 911. East side of Pajunga Island, Kvvandang-bay. Reef, i male. 



Professor Coutiere in his valuable dissertation of 1899, entitled Les "Alpheidae", remarks 

 p. 296, that in the genus Synalphejis the 2"'^ pleopods show no sexual difference and that in 

 some species the 2"^ pleopod of the male bears even no stylamblys, so e. g. in Syn. neptumis 

 (at least some specimens), in Syn. biunguiculatzis etc., while in the female of the same species a 

 single, though well-developed stylamblys occurs. After having examined the 2"<' and the 3'<i. 

 pleopod of the specimen from Kwandang-bay under the microscope, the endopodite of both 

 pleopods proved to be devoid of a stylamblys and the endopodite of the 1^^ proved to bear 

 no appendix masculina : we may therefore conclude by analogy that the specimen from 

 Stat. 115 is a male. 



The rostrum is long, slender, acute, 4^/5-times as long as broad at the level of the 

 orbital margin, reaching almost to the middle of 2'"i antennular article; lateral spines half as 

 long as the rostrum, elongate-triangular, slender, with the acute tips slightly turned inward, 

 the tips bearing a forwardly directed seta. 



Antennular peduncle 4-times as long as the 2'"^ joint is wide distally ; basal joint as long 

 as the 2"<i and i""^ taken together, 2"'^ joint a little longer than wide, 3''' a litde shorter than 

 a""!; stylocerite as long as basal article. Basicerite truncate above, straight; lower spine 

 of basicerite a little longer than the outer margin of the basal part and a trifle longer or as 

 long as the stylocerite. Carpocerite 3-times as long as wide in the middle, distinctly narrowing 

 to the distal extremity, projecting beyond the antennular peduncle by a little more than the 

 3"^ article; terminal spine of scaphocerite a little shorter than the carpocerite, but much longer 

 than the antennular peduncle; scale of scaphocerite reaching to the middle of 3''^ article. 



