of the Virginian Coast. 11 
Tentacular cirri arise from a long basal article, much 
enlarged at origin. The superior cirrus is a little shorter 
than the median antenna; inferior, a little shorter than 
the superior. 
The elytra are smooth, border without appendages. 
There may be from 38 to 50 on a side. They can not be 
enumerated in pairs, since opposite sides of the same seg- 
ment may bear, one, an elytron, the other, a dorsal cirrus. 
For the first 82 segments the arrangement is uniform ; viz : 
1, 3^ 4, 6, 26, 27, 29, 30, 32. After the 32d segment no 
two specimens present exactly the same arrangement ; 
even the opposite sides of the same specimen, as mentioned 
above, difl'eriug both in the number and position of the 
elytra. For example, on one specimen between the 39th 
and 44th segments, inclusive, was the following arrange- 
ment. Right side, elytra on 39th and 44th segments : 
Dorsal cirri, 40, 41, 42,- 43. 
Left side, elytra, 39, 41, 42, 44 : 
Dorsal cirri, 40, 43. 
The elytra (figs. 25, 26, 27) extend along the entire 
length of the body, and in some cases cover the body 
completely, but usually there is a naked median space of 
variable width, and often they do not overlap, or even 
touch each other in any direction. Anterior pair of elytra 
circular, elsewhere oval, longer axis transverse, anterior 
margin emarginate when overlapped by preceding elytron ; 
otherwise rounded. A variable number of posterior seg- 
ments are without elytra. These segments are very short, 
and are always covered by the last pair. 
The dorsal cirri arise from stout, nearly cylindrical 
basal articles (f. 28), which are one-third as long as the 
cirri. They extend a little beyond the foot. Their struc- 
ture is the same as that of the antennae, save that the 
subterminal swelling is cvei: less obvious. The basal arti- 
