566 



THE VOYAGE OF H.M.S. CHALLENGER. 



Observations. — As shown in the plate this specimen has attached to the pleopoda 

 (fig. 5q) a number of egg-like bodies (fig. 5 par), which I at first took to be the ova, 

 but a close inspection showed that each was attached by a peduncle to the stalk of the 

 pleopoda. The surface of the capsule has a roughened appearance, and when it was 

 ruptured by compression a number of what appeared to be the eggs of some animal, 

 unknown to me, were liberated. Within each small sac was an embryo, but not 

 sufficiently advanced to enable me to determine its characters (fig. 5 par). It is 

 probably a parasite, and in general aspect resembles a minute Sacculina, but I do not 

 think it belongs to that group, inasmuch as the embryo exhibits no Crustacean 

 peculiarities. 



Alpheus malleator, Dana, and Alplieus obesomanus, Dana, have the larger hand 

 of the first pair of pereiopoda with the same peculiar mallet-shaped dactylos as is present 

 in this species. 



Betseus microstylus, n. sp. (PL CI. fig. 6). 



Orbital lobes considerably produced, leaving the median line of the frontal margin 

 depressed and excavate. 



First pair of antenna? having the stylocerite not longer than the first joint of the 

 peduncle. 



Second pair of antennae having the scaphocerite deeply cleft between the outer tooth 

 and the squamous portion, which is fringed with hairs on the inner side. 



Telson quadrate, laterally and dorsally armed with two small spines, and terminally 

 fringed with hairs. 



Habitat. — Albany Island, Cape York. One specimen. 



