NO. 1659. AMERICAN SI'FJCIES OF SYNAnPIIEUS—COUTIERE. 



65 



is prolonged baclvAvarJ by a very slight, but wide, crest. The articles 

 of the autenniile are to one another as 1.8, 1, 1. 



The lateral spine of the basicerite is a little longer than the anten- 

 uiilc and also than the spine of the scaphocerite ; the latter is a little 

 n.arrower than the preceding, and carries a very well marked rudi- 

 ment of a scale which does not, however, exceed the extremit}^ of the 

 basal antennular article. 



The large chela has as proportions, fingers 1 ; total length 4 ; height 

 1.5; it is more tapering distally, and the tubercle on the margin of 

 the palm is less prominent, bearing no spine; the superior margin of 

 the meropodite is convex, and rounded at the distal extremity. 



The small chela is missing. 



Fig. :n. — SvNALPHEUs parfaiti. a, frontal and antennal region ; K, large chela 

 AND CARPUS ; K", carpu.s and meropodite of large cheliped ; m, FOOT OF third pair; 



111',, DACTVL OF THIRD PAIR ; t, TELSON ; tt, UROPOD. 



In the second j^air the first segment of the carpus, the four follow- 

 ing, and the distal chela are approximately equal. 



The proportions of the third pair are: Merojiodite 2.28; carpus 1; 

 propodite 1.7; the meropodite is 3 times longer than wide, as in S. 

 gramp i/.'^i. 



The height of the telson is 1.08 times the width of the base, 2.66 

 times the posterior margin, which latter has its inner spines 2.5 times 

 wider than the outer, and also much stronger; between them are six 

 plumose hairs and two lateral groups of three simple hairs; the spines 

 of the superior face are shorter and stronger than in S. grampusi. 

 Proc. N. M. vol. xxxvi— 09 5 



