294 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [588] 
This species is closely allied to P. pulchella Malmgren, from Northern 
Europe, but differs somewhat in the form of the head, which is shorter 
and rounder in the latter; the branchie also differ inform. It isa very 
active species, and secretes a large quantity of mucus. 
ETEONE ROBUSTA Verrill, sp. nov. (p. 488.) 
Body large, stout, depressed, broadest in the middle, tapering gradu- 
ally to each end. Head small, about as long as wide, convex, with a me- 
dian depression; the sides rounded; front obtusely rounded. The four 
frontal antenne are very small, short, obtuse, less than half the diameter ~ 
of the head. Eyes very small, black. Tentacles very small and short) 
taperfng, their length about one-half the diameter of the head, the two 
pairs about equal. Branchiz small, sessile, anteriorly very small, oval, 
obtuse; in the middle region rounded, sub-oval. Color dark green, with 
the anterior portion somewhat paler, and with light green transverse 
bands between the segments; lateral appendages pale green. 
Length, 125""; breadth in middle, 5™™; length of head, 0.6". 
Watch Hill, Rhode Island, under stones, between tides, April 12, 1873. 
ETEONE LIMICOLA Verrill, sp. nov. (p. 349.) 
Body very long and slender, tapering gradually to bothends; depressed, 
and with deeply incised, elongated segments posteriorly ; less depressed 
and with shorter and less distinct segments anteriorly. Head small, 
about as broad as long, the posterior angles well rounded, the sides with 
a slight constriction in advance of the eyes, narrowing rapidly ; front 
narrow, convex; antenne slender, about half the length of the head. 
Eyes minute, inconspicuous. Tentacular cirri about equal to the length 
of the head. Lateral appendages small on the anterior segments, becom- 
ing much more prominent farther back; anterior branchie very small, 
ovate, sessile; those farther back much larger, aud narrow ovate. 
Color, when living, light green throughout. 
Length about 80"™; breadth, including appendages, 1.5"™. 
Great Egg Harbor, New Jersey, in mud at low-water. 
ETEONE SETOSA Verrill, sp. nov. 
Body long and slender, resembling the preceding in form, but some- 
what less slender. Head shorter and broader, the posterior angles 
prominently rounded; two slight notches or emarginations on the 
posterior margin, the middle portion extending farther back than the 
lateral; sides rapidly tapering; front narrow. Antenne less than half 
the length of the head. Eyes small, but quite distinct. Tentacular 
cirri scarcely as long as the head. Lateral appendages a little promi- 
nent on the anterior segments, but much less so than farther back; setz 
numerous. The branchiz are small, sessile, and inconspicuous anteriorly ; 
larger and ovate farther back. 
Length up to 75™"; breadth about 2™™. 
Vineyard Sound, 6 to 12 fathoms, among ascidians. 
