REPORT ON THE CRUSTACEA MACRURA. 857 



The second pair of antennas carries a very long scaphocerite that lias the outer 

 margin curved outwards, the apex sharply pointed and rigid, and the inner fuliaceous 

 division reduced to a longitudinal narrow margin, fringed with long hairs. The basal 

 joint tarries a small tooth on the upper surface near the articulation of the scaphocerite. 



The oral appendages have not been examined in this specimen. 



The first pair of guathopoda lies curved up against the mouth, and is seven-jointed ; 

 the terminal joint is double, and the coxa carries a small branchial plume, but I have not 

 detected a mastigobranchial plate ; the basis carries a long and slender ecphysis ; the 

 ischium is long, subcylindrical, and fringed on the inner surface with numerous much 

 ciliated strong stiff hairs ; the next joint, which is analogous to the carpos, curves abruptly 

 round, so that the more distal joints are flexed against the ischium ; the next joint, which 

 represents the propodos, is subcylindrical and increases in diameter distally, at which 

 extremity the terminal branches stand side by side, one longer than the other, and both are 

 flat, long-ovate, and copiously fringed with stiff, curved, and ciliated hairs ; some longer 

 hairs stand on the outer angle of the preceding joint and fringe the inner margin, all 

 possessing stout and strong cilia, giving to the organ a powerful brush-like character, 

 so that it has the power of sweeping an area round the mouth and collecting material 

 for food. 



The second pair of guathopoda has been broken at the carpal-joint of the meros, but 

 so far as preserved it generally resembles that of the preceding species. 



The first two pairs of pereiopoda are free from teeth on the anterior margin and 

 fringed with hairs on the posterior ; the palm is very short, and the fingers long, straight, 

 and parallel. The posterior three pairs arc strong and smooth, being free from the 

 dentation or the spinous condition of the preceding species. 



The pleopoda are biramose ; the first pair has the inner branch short and bud like, 

 and the others have the two branches subequal. The terminal pair helps to form the 

 rhipidura, and is subequal in length with the telson ; the outer branch is the longer, 

 has an oblique diaeresis, and is armed at the outer margin with a small tooth and spine. 



Family Pasiph.sid^. 



This family has not been well defined. Milne-Edwards 1 says that the genus Pasiphasa 

 establishes in many respects a passage between Penseus and Sergestes, but this view, I 

 think, cannot be accepted, seeing that Pasiplisea belongs to the Phyllobranchiata and 

 Penseus and Sergestes belong to the Dendrobranchiata, the different form of the 

 branchiae in the two divisions precluding these genera from belonging to one and the 

 same division. 



The remarkable features in the Pasiphseidse appear to exist in the imperfect develop- 



1 Hist. Nat. Crust., torn. ii. p. 424. 



(ZOOL. CHALL. EXP. — PART LSI. 1887.) Eff 108 



