554 



THE VOYAGE OF H.M.S. CHALLENGED. 



The late Sir Walter Elliot, S.I., obtained a specimen at Waltair, near Madras, which, 

 so far as I could determine from a well-executed drawing, resembles this in every detail. 

 He says in his notes that in the living state the colour on the back is green, and that 

 on the large pair of legs blue, mottled with white spots, the claws being tipped with 

 yellow ; the three pairs of pereiopoda are also blue, and the long pair of antennae, which 

 is one and a half times the length of the body, measured from the base of the first joint 

 to the end of the tail, is also bluish. 



Alpheus crassimanus, Heller (PL XCIX. fig. 2). 



Alpheus crassimanus, Heller, Beise der Novara, Crust., p. 107, pi. s. fig. 2. 



Rostrum short, spiniform, anteriorly depressed ; separated by a groove on each side 

 from the orbital lobes, which are prominently developed. 



First pair of antennse having the second joint of the peduncle longer than the first, 

 with the stylocerite reaching to the extremity of the first joint. Flagella unequal, the 

 upper and more robust being as long as the peduncle, the lower and more slender as 

 long as the carapace. 



Second pair of antennas having a small tooth at the base and a scaphocerite that is as 

 long as the peduncle. 



First pair of pereiopoda having the larger hand upon the left side, the upper and 

 lower margins being slightly constricted, the former close behind the dactyloid articulation 

 and the latter still more posteriorly. The pollex is broad, flattened, internally concave and 

 produced anteriorly to a lanceolate point. Dactylos broad and flat, lanceolate in form, 

 constricted posteriorly, broadly ribbed down the centre, and pointed anteriorly in the 

 form of a curved tooth ; the outer margin is thickly fringed with cilia. The right or 

 smaller hand is wanting, nor is it figured by Heller, but he describes it in the male as 

 being " half the size of the other, having the palm a little compressed and sinuated on 

 both margins near the apex. Fingers scarcely shorter than the palm." 



The second and following pairs of pereiopoda rather long ; the fifth pair more slender 

 t han the third and fourth. 



Le 



Habitat. — Off Albany Island, near Cape York ; depth not given. 



Heller records his specimen as having been found at the Nicobar Islands. 



Observations. — There can, I think, be little doubt that the specimen which I figure 

 belongs to the same species as that described by Heller as Alpheus crassimanus. 



