52 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVI. 



PALiEMON SERRIFER (Stimpson). 



Leamkr xtrrifcr Stimpson, Proc. Acad. Nat. Sci. Phila., XII, 1860, p. 41 [110].— 

 De Man, Notes Leyden Mus., Ill, 1881, p. 139.— Ortmann, Zool. Jahrb., 

 Syst., V, 1891, p. 525, pi. xxxvii, %. 17. 



Misaki, Salami; Jordan and Snyder collection. Atami district; F. 

 Sakamoto collector, April, 189-i. 



Out of 21 specimens with perfect rostrum, 7 have 9 teeth above, 

 the remainder mostly 10 teeth above; 15 have 3 teeth below, the 

 remainder varying from 2 to 5 teeth. 



PALiEMON MACRODACTYLUS, new species. 



Stout. Rostrum about as long- as carapace, it may be a little longer 

 or a little shorter, overreaching a little the antennal scale; straight in 

 basal half, slightly inclined upward in distal half; armed above with 

 9 to 15 teeth, 3 of which are on the carapace, 3 to 5 below, tip usually 



bifid; posterior dorsal 

 p/ tooth more remote from 

 " the others; the anterior 

 tooth ma}?^ be remote 

 from the others or re- 

 mote from the tip. Only 

 large specimens have 13 

 to 15 teeth above; the 

 usual numlier is 10 to 

 12. Antenuular pedun- 

 cle reaching to distal 

 fourth of scale; antennal peduncle to end of first antennular segment. 

 Filaments of outer flagellum of antennula united for from 7 to 9 

 joints; short filament uiuch longer than the basal portion. Acicle 

 oblong, very broad at extremity. 



Outer maxillipeds reaching beyond antennal peduncle by at least 

 two-thirds of the last segment. The first pair of feet, extended, touch 

 the end of the scale; the carpus is one and two-thirds times as long as 

 the chela; the palm is a little longer than the fingers. The second 

 pair of feet may exceed the scale by the length of the chela and part 

 of the wrist. The carpus is subequal to the merus, exceeds the manus 

 in length, and is distally enlarged. Palm compressed, broader than 

 carpus, longer than fingers. The last three pairs of legs are very 

 nearly of a length, the fifth pair attain the end of the scale; the 

 dactyli of the third pair are contained twice or two and a half times, 

 of the fifth pair about three times, in their propodi. 



The sixth segment of the abdomen is half as long as the carapace 

 (rostrum excluded), and three-fourths as long as the telson, which has 

 two pairs of lateral spinules, and at the extremity a short median and 

 lateral spine and a very long intermediate spine. 



Fig. 24.— Pal^mon macrodactylus; a, carapace, x If; 



3, ACICLE, X 2|; c, CHELA OF SECOND PAIR, X 2g; rf, FOOT 

 OF THIRD PAIR, X 3i. 



