476 



THE VOYAGE OF H.M.S. CHALLENGER. 



First pair of antennae with short fiagella. 



Second pair of antennae with sharp-pointed scaphocerite. 



First and second pairs of pereiopoda chelate. 



Sixth pair of pleopoda unequally branched. 



Habitat. — Taken at the surface, off Mindanao, Celebes, February 6, 1875. 

 specimen (young). 



One 



The carapace only covers part of the pereion, the posterior portion being exposed on 

 the dorsal surface, and together they form a globose or rounded mass. The frontal 

 margin is produced between the ophthalmopoda, where it is wide, to a long and gradually 

 tapering rostrum, which is fringed at the sides with small stout hairs or spines. The 

 postero-lateral angles of the carapace are produced to long teeth, but the margins are 

 smooth and even. 



The pleon is less than one-third the width of the carapace and gradually narrows 

 posteriorly. The fifth somite 1 is armed on each side postero-laterally with a small tooth. 

 The last somite is shorter than the preceding, and the telson is broad and flat, gradually 

 increasing in width posteriorly, where it terminates laterally in sharp points surmounted 

 by a strong spine, on the inner side of which the distal margin is fringed with four or five 

 on each side. 



The ophthalmopoda are large, curved, and gradually increase in diameter to the 

 ophthalmus, which is obliquely implanted on, and much larger than, the stalk. 



The first pah* of antennae has the peduncle three -jointed, the second joint being the 

 shorter and the first and third subequally long ; the terminal fiagella are short. 



The second pair of antennae has the flagellum subequal in length to the rostrum, and 

 the scaphocerite reaches to the same point, terminating in a sharp extremity. 



The oral appendages have not been examined. 



The first and second pairs of pereiopoda are larger than the others and subequally 

 chelate, the chelae being long and broad with the margins corresponding. The other 

 pereiopoda appear to be short, robust and simple, and lie folded against the ventral 

 surface of the pereion. 



The ultimate pair of pleopoda is well developed ; the inner branch is about half the 

 length of the outer, which is not quite as long as the telson and has the inner margin 

 fringed with hairs. 



1 I have erroneously figured the pleon with too few somites ; the lobe shown as the pereion should be divided. 



