
No. 463] NORTH AMERICAN INVERTEBRATES. 437 
1. Dorsal surface brown or purplish ; central and accessory stylets papa 
2. Stylets short, with swollen heads; basis of central stylet swollen i 
rounded posteriorly ; 11 proboscidial nerves ; dark brown above, often 
with minute purple dots ; flesh-colored or yellowish white beneath 
. bürgeri Coe, A, P. 
2. Stylets without swollen heads, fluted longitudinally ; basis of central 
“pP 
9 
9 
Hw 
stylet not swollen posteriorly; 16 proboscidial nerves ; purplish or 
purplish brown from closely placed oe on dorsal surface ; ven- 
tral surface gray or yellowish . . . E. purpuratum Coe, B. 
NEMERTOPSIS. 
Filiform, often 15 cm. or more in length ; very pale brown or whitish, with 
2 longitudinal dorsal stripes of deep brown ; 8 proboscidial nerves 
N. gracilis Coe, C. 
T CARCINONEMERTES. 
Length when sexually mature but 4 to 6 mm. ; with 2 large ocelli ; orange 
or reddish ; parasitic on egg masses of diee productus and per- 
haps other crabs . ‘ ; C. epialti Coe, C 
PARANEMERTES. 
White or flesh-color ‘ : 7 \ "d v 
With orange, green, brown, or aspe tints . à ; « 2 X 
With 2 or 4 pouches of accessory stylets; 14 proboscidial nerves; 
stylets have braided appearance; purplish brown, dark brown, or 
orange brown above, on sides, and on lateral margins of ventral sur- 
face; with a whitish angular spot on each side of head; ventral 
surface, often median third only, white or yellowish white 
P. peregrina Coe, B. A, P, C s. 
With 4 or 6 pouches of accessory stylets; 10 large proboscidial nerves ; , 
translucent; pale orange anteriorly ; flesh-color, grayish, or very pale 
re posteriorly, much obscured i er green color of intestinal 
P. californica Coe, S. 
ub 4 ponches ol icceiaory BT ; 3 or 10 rons nerves ; 
opaque white . P. pallida Coe, A 
With 6 or 12 pouches of ücoesóty sles ; 11 or 12 proboscidial nerves ; 
whitish, pinkish, or flesh-color — . P. carnea Coe, A, P. 
ZYGONEMERTES. 
Central stylet short and stout . 
Central stylet rather slender. 
