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ALPHEUS PEAEDATOR. 



Larger chela as in A. hidens, but the groove on the 

 upper border near the dactylus is continued on the outer 

 (lower) surface of the palm until near the lower border 

 and from the middle of this groove a broad, though shal- 

 low depression extends almost to the middle of the outer 

 surface of the palm ; as the fingers, that measure two fifths 

 of the length of the chela, are still more turned outward 

 than the palm, the upper border of the dactylus is almost 

 situated inferiorly. Lower border of the immobile finger 

 grooved longitudinally. 



Legs of 3^^ and 4^^ pair of a stouter shape than those 

 of A, hidens^ but for the rest resembling them. So e. g. 

 are the meropodites of the S^^ legs, armed with a strong, 

 acute tooth, 4-times as long as broad in the middle and 

 the propodites 4^/2-times as long as broad. 



One specimen, perhaps a young female, 14mm. long. 



7. Alpheus tenuicarpus, n. sp. 



Station 114. Lat. 0°58'.5 N., long. 122°55' E. Kwan- 



dang-bay-entrance. Depth 75 M. 

 Station 311. Sapeh-bay, East coast of Sumbawa. 

 Depth up to 36 M. 



A species of small size, pertaining to the group „insignis'' 

 Cout. or „brevirostris'^ de M. and related to A, parol- 

 pheopsides Cout. 



Frontal margin exactly as in A. pamlpheopsides, rostrum 

 acute, almost reaching to the middle of 1st joint of anten- 

 nular peduncle, rostral carina sharp but little prominent 

 and not reaching beyond the bases of the orbital hoods. Telson 

 narrow, a little more than twice as long as broad, spinules 

 on the upper surface large and situated close to the 

 lateral margins. 



Second joint of antennular peduncle twice as long as thick, 

 just as long as the visible part of the 1st and one and a half as 

 long as the S^''^ joint; carpocerite longer than antennular pe- 

 duncle, terminal spineofscaphocerite reaching but little beyond 

 the blade and extending almost to the end of the carpocerite. 



]S"otes from the Leyden Museum, Vol. XXX. 



