8o 



n. sp., PI. XIV, fig. 6 c) it is more strongly chitinized and shaped about as a somewhat long, 

 moderately thick, distally a little thickened and blunt process, while in E. mutica H. J. H. 

 (PI. XIV, figs. \b and ie) the same distal half reminds one of the head of a bird sitting on a 

 short neck and with a thick, curved, acute, well chitinized beak. The setiferous lobe frequently 

 only with setse along the terminal margin. 



In Nematoscelis G. O. Sars (PI. XV, fig. 2 f and some other figures) the inner lobe has 

 all three processes, but the proximal process (/> 3 .) is at most feebly curved and inserted near the 

 terminal one on the end of lobe, and the median lobe has no additional process. The processes 

 are, on the whole, more simple than in the two preceding genera; the proximal and the lateral 

 processes are straight or feebly curved, while the terminal process differs extremely in size and 

 shape in various species. 



In StylocJieiron (PI. XVI, several figures) the inner lobe is united with the median nearly 

 or quite to its end ; the median lobe is shorter than in the preceding genera, with its lateral 

 process inserted rather near or quite at the base of the inner margin, and in the latter case this 

 process is situated close at the proximal process. The inner lobe possesses all three processes; 

 the spine-shaped process is normal and inserted on the inner margin near its end ; the two 

 other processes are near each other and both proportionately short, frequently broad and distally 

 flattened, even expanded and sometimes somewhat spoon-shaped. In this genus the processes 

 are on the whole less developed and more similar in some species, therefore of minor value for 

 separating otherwise allied forms. The auxiliary lobe is either small and placed on the lateral 

 margin of the setiferous lobe or, in 5". carinatum G. O. Sars (figs. 1/ and i^-), quite rudimentary, 

 but its place can be found, as two or three coupling hooks (c.) are still existing. 



In Pseudeuphausia latifrons G. O. Sars (PI. XV, figs. 1 c and 1 d) the whole organ 

 is quite aberrant; it is even not easy to refer some of its elements to those of Thysanopoda 

 tricuspidata. The inner lobe (//.) has three small, spiniform processes, the real spine-shaped 

 process (p. 1 ) placed on the oblique terminal margin, while the terminal and proximal processes 

 {p~. and p i .) are inserted near each other on the outer margin. (On a single organ I found 

 two spine-shaped processes (fig. 1 d) instead of one, but that is probably a casual anomaly). 

 The median lobe has no real processes, but where the lateral process is normally found a very 

 large, oblong, leaf-shaped plate (p i .), probably homologous with the lateral process in other 

 genera, is articulated. The setiferous lobe (/s.) is extremely narrow, without sete, and originates 

 near the base of the organ • an auxiliary lobe is wanting, but some coupling hooks (fig. 1 d, c) 

 are found on the margin of the main plate close before the insertion of the leaf-shaped plate. 



Bentheuphausia G. O. Sars. 

 Only a single species is known. 



1. Bentheuphausia amblyops G. O. Sars. 



1883. Thysanopoda (?) amblyops G. O. Sars, Forh. Vid. Selsk. Christiania for 1883, N° 7, p. 23. 

 1885. Bentheuphausia amblyops G. O. Sars, Challenger Rep. Vol. XIII, p. 109, PI. XIX; 

 Woodcut, fig. 4. 



