They are, however, he says, perhaps taken from a young specimen. V. viator, Stebbing, again, has the telson more like that of my specimens than V. propinqua has, and seems to be intermediate in this respect between the two, having the telson somewhat triangular, with the corners well rounded, instead of “pear-shaped” or “circular.” Of V. viator Stebbing says, “The uropods and telson are in very close agreement with those of V. propinqua,” though his figures do not agree quite so closely. It is very easy, however, to make a considerable difference in figures drawn even as accurately as possible, when taken from different specimens of the same species; and Mr. Stebbing's remarks lead me to think that possibly the telson of V. propinqua is not always so distinctly pear-shaped as shown in his figure, but may sometimes approach somewhat to a more circular form. Certainly the several species mentioned are very closely allied, and probably should be looked upon as local varieties of a widely-dispersed species rather than as distinct species.

Vibilia gracilis, Bovallius, resembles V. milnei in having a round telson; but I have not been able to get a description of this species.

I give the following description of the telson and uropoda of my specimens:—

Telson as broad as long, nearly circular but broadest towards the base, margins quite entire. First uropoda with the peduncle reaching as far as the end of the peduncle of the second uropoda, its outer margin serrated towards the end, rami subequal, outer one with outer margin rather coarsely serrate, inner margin with two large serrations near the end and the rest minutely serrate, inner ramus with both margins serrate towards the end: second uropoda with rami subequal, shorter than those of first uropoda, outer ramus with its outer margin somewhat coarsely serrate, inner margin minutely serrate; inner ramus with outer margin minutely serrate, inner margin entire except towards the end, where it is minutely serrate: extremities of the rami of first and second uropoda acute: third uropoda with the peduncles broad but narrowed at the base, margins entire, rami about as long as those of second uropoda but broader; outer ramus with outer margin convex, entire, inner margin minutely serrate, one or two minute setæ placed at the rather blunt extremity; inner ramus with its outer margin minutely serrate throughout, inner margin with minute serrations, which incrcease towards the extremity, which is acute, and tipped with a minute seta.

The fifth and sixth segments of the pleon appear completely coalesced.

Colour.—The Vibilia is reddish in colour, the colour being