28 



rROGEEDINGS OF THE NATIONAL MUSEU.V. 



VOL. XXXVI. 



The stylocerite scarcely reaches the middle of the median article; 

 the superior spine of the basicerite nearly equals the frontal teeth; 

 its lateral spine does not reach the extremity of the basal antennular 

 article; the scale of the scaphocerite, five times as long as wide, is 

 shorter than the antennule, its lateral spine slightly shorter than the 

 carpocerite, which last, three times as long as wide, is swollen at the 

 base and pyrif orm ; it is long in the sense that it takes its origin below 

 the point Avhere the stylocerite is detached from the basal article of 

 the antennule and that it exceeds the antennule by about two-thirds 

 of its distal article. 



The outer maxillipeds do not exceed the carpocerite. The large 

 chela has the following proportions: Fingers 1; total length 3.15; 



Fig. 9. — SyNALPiiEis .\rincEROs. «, frontal and antexnal region; c, carpocerite; K, 



LARGE chela; K" , CARPUS OF LARGE CHELIPED ; k' , SMALL CHELIPED OF FIRST PAIR; I, 

 FOOT OF SECOND PAIR; «! , FOOT OF THIRD PAIR ; w', DACTYL f)F THIRD PAIR; t, TELSON. 



height about 1.28; the proportion T. L. : H.=2,8:l; the anterior bor- 

 der of the palm is swollen in a tubercle, which terminates in a spine 

 directed slightl}^ obliquely downward. 



The small chela has, as proportions, fingers 1; total length 2.8; 

 height 0.95; T. L. : H.=2.95:l; it is thus relatively slender with 

 short fingers; the wrist is spinous on its supero-external border; the 

 meropodite, a little less thick than the palm, is 2.35 times longer than 

 wide. The proportion of the tAvo chela' is about 1:3. 



Tn the second pair the first segment of the carpus equals apparently 

 the sum of the others, and the meropodite is more slender than in S. 

 lockhir/toni; the chela is also notably shorter. 



The proportions of the third pair are : Carpus 1 ; propodite 2; mero- 

 podite 2.28, this last being a little more than four times as long as 



