REPORT ON THE AMPHIPODA. 1331 



much longer than the other pair ; the second pair is not spine-like, but tubercular, 

 blunt-ended, apparently forming the antennary gland-cone with its terminal channel. 



Mouth Organs. — It is extremely difficult to say whether the small differences 

 observed between the mouth organs of the present and those of larger specimens are 

 of any specific value ; here on the left mandible the cutting edge has nine teeth, and 

 the secondary plate has ten, the cutting edge of the right mandible has nine teeth ; 

 the rows of denticles on the crown of the molar tubercle were here seen to number 

 about twenty, forming a serried mass ; the outer plate of the first maxilla? has on its 

 inner margin four setae, followed by three rather narrow spines ; these are followed 

 without interruption on the apical margin by a connected series of spines successively 

 stouter, seven in number, to which succeeds the set of six or seven stout spines grouped 

 round the outer apex ; there are also several submarginal setae ; the outer plates of the 

 maxillipeds have five teeth on the inner margin, the one nearest the apex being 

 irregularly jagged. 



First Gnathopods less than one-fifth of an inch long ; Second Gnathopods a quarter 

 of an inch; First Perseopods eleven-twentieths; Second Perseopods sixteen-twentieths; 

 Third Perseopods a little over an inch ; Fourth Perseopods eighteen-twentieths of an 

 inch; Fifth Perseopods nine-twentieths; the relative lengths of the fourth and fifth 

 joints of the various peraeopods are like those described for Specimen F from Station 

 196; the First Uropods are six-twentieths of an inch long to the extremity of the 

 narrow outer branch, the length of the branch being two-twentieths; the coalesced 

 inner ramus is slightly shorter ; the Second Urojjods are five-twentieths of an inch 

 long, the outer ramus almost two-twentieths. 



Pleop>ods. — Peduncles as long as the rami ; coupling spines very slender, joints of 

 the rami numbering from ten to twelve, the first joint in each ramus very long. 



Telson as usual very small and shallow, not so broad as the peduncles of the 

 uropods, not so long as broad, its distal margin rounded. 



Length. — The figure at the top of the Plate is intended to represent the natural 

 size, and according to this it would not be more than an inch and a quarter long, but 

 the specimen was in a crumpled flaccid condition, and might possibly have been in life 

 rather longer. 



Locality. — Station 170a, July 14, 1874 ; off the Kermadec Islands; lat. 29° 45' S., 

 long. 178° 11' W. ; depth, 630 fathoms; bottom, volcanic mud; bottom temperature, 

 39°-5 ; surface temperature, 65°-2. One specimen, male or young. Trawled. 



Cystisoma spinosum (Fabricius). Specimen E. 



This specimen of moderate size was taken comparatively near to specimen G, the 

 distance between their respective localities being about 3 degrees of latitude and 17 



