NO. 1659. AMERICAN SPECIES OF SYNALPHEUS—COUTIERE. 



77 



stead of 3.3 in the male, or 3 in the female) and its width is only 0.78 

 of that of the palm (instead of 1.23 in the male, 1.15 in the female, of 

 S. herricJH). This slenderness of the meropodite recalls S. hrooksi. 

 On the other hand, the large chela is equally slender, as in that last 

 species: P^ingers 1; total length 3.28; height 1.22; proportion T. L. : 

 H. = 2.7 (1, 3.6, 1.28, 2.8 in the female of S. hrooksi, in which the 

 large chela resembles more that of the male). The anterior palmar 

 •tubercle also ends in a slender point. 



^ I shall give to these last specimens the name of S. herncki 

 dimidiatus. 



Another variation is presented by a female from Albatross Station 

 No. 2372. The rostrum is narrower and the lateral spines wider and 

 more obtuse than in S. hernchi. The proportions of the large chela 



Fig. 47. — SYNALPHErs tanneki. a. FRONTAr, and antennal region; c, oakpocerite ; K, 



LARGE chela; W , SMALL CHELIPED OF FIRST PAIR; I, FOOT OF SECOND PAIR; W, FOOT OF 

 THIRD PAIR. 



are : Fingers 1 ; total length 3.35 ; height 1.39 ; proportion T. L. : H.= 

 2.4, which approaches near to S. hcTriclA; the anterior palmar tubercle 

 is ver}^ obtuse ; the small chela differs from that of S. lierrichi in the 

 short carpus, measuring only 0.56 of the whole chela; the cheliped 

 is also more slender, the Avidth of the meropodite being 1.2 times its 

 ordinary width; in spite of the shortness of the carpus, the mero- 

 podite measures 0.75 of the carpus and chela together, as in the 

 female of hernchi, the palm of the small chela being more elongate 

 than in the types of the species (fingers 1, total length 2.6, height 

 0.8, ratio T. L. : H.=3.2, instead of 1, 2.47, 0.87, 2.8 in 8. herncki 

 female) ; the feet of the second pair, rather slender in S. herricki, 



