102 



ALPHEUS CONSOBRINUS. 



half as long as broad, inner margin with acute tooth near 

 the far end; chela a little less high in proportion to its 

 length, but for the rest as in A. buceplialus. Meropodite 

 of larger chelipede of female twice as long as broad, chela 

 considerably smaller than in the male, little more than 

 half as long. 



Chela of smaller chelipede of the male resembling that 

 of A. clypeatus, fingers slightly longer than the palm; 

 dactylus much broadened, half as broad as long, fringed 

 with hairs along its inner (upper) edge. Inner (upper) surface 

 of the chela hairy, 3-times as long as broad. 



Chela of smaller chelipede of the female similar to that 

 of A. buceplialus^ the palm being in proportion to the 

 fingers as 13 : 10. 



Carpus of 2 nd legs as in A. buceplialus, 2 n(1 joint in the 

 male almost 3-times, in the female somewhat more than 

 twice as long as the 1 st , 5 th joint in the male slightly 

 longer than the 1 st , in the female both of equal length. 



Legs of 3 rd and 4 th pairs as in A. bucephalus. 



Length of male 14,5 mm., of adult female 15,5 mm. 



5. Alpheus bicostatus, n. sp. 



Station 37. Sailus Ketjil, Paternoster-islands. Depth 

 27 M. and less. 



Station 99. Lat. 6°7'.5 N., long. 120°26' E. Ancho- 

 rage off North-Ubian. Depth 16—23 M. 



Station 205. Buton-strait, between floating seaweed. 



A new species of the group „insi$7iis" Cout., closely 

 related to A. bidens (Oliv.) and A. cristatas Cout. 



Rostrum acute, reaching about to the end of 1 st joint of 

 antennular peduncle, rostral carina subacute or obtuse, little 

 prominent, without the teeth characteristic of A. cristatus, but 

 with a very small tubercle immediately behind the base of the 

 orbits, as in A. bidens. Midway between this tubercle and 

 the frontal margin, at either side, a thin lamellar crest 

 with rather sharp edge passes from the rostral carina 



Notes from the Leyden Museum, "Vol. XXX. 



