REPORT ON THE CRUSTACEA MACRURA. 561 



free from spines, but furnished with a few hairs towards the distal extremity. Dactylos 

 biunguiculate, most conspicuously so on the anterior pair. 



Telson (fig. 3z) shorter than the outer plates of the rhipidura; broad at the base and 

 evenly tapering to the posterior margin, where it is truncate and armed with two small 

 spines at the outer angles. There are no spines on the dorsal surface, which is quite 

 smooth and grooved in the median line. 



HaUtat.— Station 208, January 17, 1875; lat. 11° 37' N., long. 123° 31' E.; off 

 Manila; depth, 18 fathoms; bottom, blue mud. One specimen; female, with ova. 

 Trawled. 



The specimen from which we have drawn this description appears to correspond with 

 that given by Stimpson, which was taken at the Island of Amakirrima near Loo Choo. 



Ours was trawled in shallow water in the narrows of the Phdippine Islands 

 associated with a male specimen of Alpheus biunguiculatus, which Stimpson says it 

 resembles. 



Alpheus gracilipes, Stimpson (PI. CI. fig. 3). 



Alpheus gracilipes, Stimpson, Proc. Acad. Nat. Sci. Philad., p. 100, January 1860. 

 „ „ Heller, Reise der Novara, Crust., p. 108. 



Carapace one-third the length of the animal. Kostrum long and sharp ; orbital 

 lobes (fig. 3c) armed with short teeth, broad at the base. 



First pair of antennas having the three joints of the peduncle subecmal, stylocerite 

 reaching as far as the extremity of the first joint of the peduncle ; outer flagellum 

 stout at the base, and becoming suddenly slender, inner flagellum slender. 



Second pair of antennae having the peduncle a little shorter than that of the first ; 

 scaphocerite subecmal in length with the peduncle ; flagellum wanting. 



First pair of pereiopoda (fig. 3k) having the chelae unecpial, the larger being on 

 the left side. It is as long as the carapace, three times as long as broad, smooth on 

 the lower side, and notched near the dactyloid articulation on the upper; dactylos about 

 one-fourth the length of the propodos. Smaller chela wanting. Third and fourth 

 pairs with the meros unarmed at the infero-distal angle ; propodos (fig. 3m) furnished 

 with long solitary spines, subequally distant, with a dactylos that is long, sharp, and 

 uniunguiculate. 



(ZOOL. CHALL. EXP. PAET LII. 1887.) Fff 71 



