124 G. 0. SARS. CRUSTACEA. [NORW. POL. EXP. 



The maxillae (fig. 5) are of more complicated structure than is usual in 

 the Cyclopoida, and, indeed, all the chief parts found in the Calanoida may 

 be easily traced. The basal division is well defined, and projects inside to a 

 conical masticatory lobe armed at the tip with 3 ciliated spines, and a similar 

 number of short, likewise coarsely ciliated bristles. Opposite this lobe, on 

 the outer side of the basal part, is a very small lobule carrying 2 densely 

 plumose setae, and apparently answering to the vibratory plate in the Cala- 

 noida. The palp is of considerable size, membranous in consistency, and 

 distinctly biramous. The inner edge is divided proximally into 2 successive 

 conical lobules, each carrying 2 unequal setae, and evidently answering to 

 the 2 setiferous lobes generally found in the Calanoida, immediately beyond 

 the masticatory lobe. The distal part of the palp beyond these lobules, is some- 

 what produced, and carries 8 remarkably strong curved setae, coarsely ciliated 

 and successively increasing in size distally. On a closer examination, 4 of 

 these setae are found to issue from a well-defined, though rather short, ter- 

 minal joint, which evidently represents the inner ramus. The outer ramus 

 forms a rather large, rounded oval plate, issuing outside the proximal part 

 of the palp, and carrying 6 very strong and densely ciliated setae, 5 of 

 which issue from the obtusely truncated end, the 6th from a ledge of the 

 outer edge. 



The anterior maxillipeds (fig. 6) are also rather unlike those in the 

 typical Cyclopoida, and exhibit some points of agreement with those in the 

 Calanoida. They are comparatively large, and in all the specimens exa- 

 mined, were extended backwards along the sides of the 1st pedigerous segment 

 (see figs. 1 & 2). They each consist of a slightly curved stem divided into 

 5 joints, the first 2 being rather large, and together constituting the basal 

 part, whereas the other 3 are very small. There are 3 distinct digitiform 

 lobes of the anterior edge, one belonging to the 1st basal joint, the other 2 

 to the proximal part of the 2nd basal joint. The first 2 lobes are rather 

 narrow and somewhat upturned, each carrying 3 coarsely ciliated setae, 

 whereas the 3rd lobe has only 2 such setae. Moreover a single, rather short 

 seta occurs at some distance beyond the 3rd lobe. It may be noted, that 

 Dr. Giesbrecht in M. phasma has found a 4th, very small lobe, issuing close 

 to the base, and carrying 4 comparatively short setse. It is very probable 

 that a similar lobe also exists in the present species, but has been lost in 



