121 DH. n. J. HATSrSEN ON THE INGOLFIELLTDiE, 



Telson (fig. 18). — The telson is short, deep, rounded, witli a 

 couple of dorsal setse. 



BrancMoB. — An oblong brancbia is found at tbe base of the 

 third, fourth, and fifth pairs of legs ; those belonging to the third 

 and fourth pairs (fig. 13, &.) are longer and more narrow than the 

 branchige of the fifth pair (fig. 15). 



Age and Sex. — Marsupial lamellae are entirely wanting ; neither 

 have I been able to discover male copulatory organs, but it 

 must be added that in order to spare the legs of the animal 

 I did not venture to examine it vertically from below. The 

 specimens must therefore be regarded as probably immature, 

 and I cannot determine the sex. 



Length. — The specimen measures 2-5 mm. in length. 



Xoca/%.— The 'Ingolf Expedition, Station 38; lat. N. 59° 

 12', long. W. 51° 05' ; 1870 fathoms; temperature at the bottom 

 l°-3 ; July 30, 1895. 



Bemarks. — The essential diff'erences between this and the fol- 

 lowing species will be pointed out in ' Eemarks ' on the latter form. 



2. In&olfiella LiTTOEAiiis, n. sp. (PI. 15. figs. 22-33.) 



Body. — The animal is a little thicker in proportion to the 

 length than the preceding species, almost thirteen times longer 

 than deep ; the third abdominal segment is only a little longer 

 than deep. In other respects it is similar to I. ahyssi, with the 

 exception that the head, all thoracic and the five anterior 

 abdominal segments are adorned with rather short dorsal setae, 

 one pair on each segment ; on the head and the first thoracic 

 segment these setse are situated near the anterior margin (fig. 22), 

 on the other segments at the end of the anterior fourth or third 

 part (figs. 22 & 32). 



Sead (fig. 22). — The head differs from that of the preceding 

 species in two particulars. The lower lateral margin has somewhat 

 behind the base of the antennae a prominent pointed angle. The 

 eye-lobe is triangular, about as long as high, with the front end 

 acute and the upper portion of its base not touching the lateral 

 margin of the head ; no visual organs could be detected. 



AntennulcB (fig. 22). — These are slightly shorter than the sum 

 of the head and the two anterior thoracic segments, somewhat 

 more robust than in the preceding species and deviating besides 

 in some particulars. The peduncle measures somewhat more 

 than three-fourths of the whole appendage, and its basal joint, 



