KONGL. SV. VET. AKADEMIKNS HANDLINGAR. BAND. 22. N:() 7. 263 



The second pair of antennen (Pl. XII, fig. 20 and 21) are as long as tlie head and 

 the first two pera^onal segments together. The first free joint of the peduncle is half as 

 long as the second, the third is much loiiger than the two preceding together. The single 

 fiagellar joint is longer than the whole peduncle, is slender, and tapers gently towards 

 the apex; the under margin is fringed with fine hairs (Pl. XII, fig. 21). 



The perceopoda are like those in the raale, but the bristles on the carpus of the 

 third and fourth pairs are less numerous. In some specimens the dactylus of the sixth 

 pair is transformed into a spout-like organ, serving as an outlet for the secretion of the 

 glands, which usually are more developed in the females than in the males; in these spe- 

 cimens the front margin of the nietacarpus is entirely smootli without bristles nor pectination. 



The pleon is scarcely longer than the last four pei*ieonal segments together. 



The urus aiid its appendages are like those in the male. 



3. PåRÅTHEMISTO PACIFICA, TH. STEBBING, 1888. 



Uiagn. Carpus perfw»?* percei priini paris metacarpo longior; margo anterior ac posterior spinis ar- 

 mati; margo posterior metacarpi pectinatus, spinis carens; dactylus dimidio raetacarpi lon- 

 gior. Metacarpus pedum secundi paris carpo paullo brevior; processus carpalis tres partes 

 metacarpi longitudine sequans, spinam terminalem longam (?) gerens. Metacarpus pedum 

 tertii ac quarti parium carpo longior. Metacarpus pedum parium trium ultimorum arti- 

 culis duobus prsecedentibus brevior. Pedunculus pedum uri ultimi paris quam telson ter 

 longior; ramus internus externo paullo longior. 



The carpus of the first pair of perceopoda is longer than the metacarpus; the front and hind 

 margins are provided with bristles; the hind margin of the metacarpus is pectinated, and 

 without spines. The metacarpus of the second pair is a little shorter than the stem of the 

 carpus; the front side of the carpal process is three-fourths as long as the hind margin of the 

 metacarpus, and bas a long(?) terminal spine. The metacarpus of the third and fourth 

 pairs is longer than the carpus; that of the last three pairs is somewhat shorter than the 

 two preceding joints together. The peduncle of the last pair of uropoda is three times as 

 long as the telson; the inner rannis is a little longer than the outer. 



Colour ? 



Length. »Three-tenths of an inch» (Stebbing). 



Hab. Tlie Pacific, between Japan and the Sandwich Islands. Lat. 35° 20' N., Long. 153° .39' 

 E., surface (Stebbing). 



Syn. 1888. Parathemisto pacifica, TH. STEBBING. — »Report on tlie Amptipoda.-. Voy. of H. 



M. S. Challenger. Zoology. Vol. 29, 

 p. 1420. 



From the diagnosis it is clear that Parathemisto pacifica comes very near to 

 P. japonica, and as Stebbing did not give any drawings I have not been able to ascertain 

 the agreement or disagreement of the two species in some points. For further knowledge 

 of the species I refer the reader to Stebbing's description (1. c. p. 1420 — 1423). 



