No. 463] WORTH AMERICAN INVERTEBRATES. 435 
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teriorly ; brownish flesh-color to reddish brown beneath, usually with 
median longitudinal ochre stripe along ventral surface 
C. occidentalis Coe, A, P. 
Brown or olive, ventral surface and lateral margins of body paler; body 
. remarkably broad and much flattened, with very thin lateral margins ; 
head very broad, with remarkably short cephalic furrows 
. Jatus Coe, A, B', A’, P', C', 40-135. 
Rather slender ; pale gray with numerous fine, irregular and much inter- 
rupted dark olive brown longitudinal lines extending whole length of 
body both above and below, but more numerous and larger on dorsal 
surface than ventrally . C. lineolatus Coe, S. 
Rather short; with conspicuous narrow [eem of dark color in median 
dorsal line, and a series of narrow transverse markings of dark color 
placed side by side on dorso-lateral aspects of body. Other markings 
may possibly be present in life . : . C. signatus Coe, B', 
Order Hoplonemertea.! 
Body provided with a pair of conspicuous lateral swimming appendages, 
or cirri, immediately back of head; posterior extremity broad and 
finlike; proboscis without stylets à . NECTON er. 
Body without lateral appendages 
Proboscis sheath not more than three jours the isch of Baar; bei 
long and slender 
Proboscis sheath extends er or soit to pair ind of body; ; vai 
usuaily not very slen 
Proboscis sheath less hai half the length of bay: obont of sal 
size 
; Biting sheath one half to ie fourt dié jengii of Bode ; pen : 
cis well developed PARANEMERTES. 
Accessory stylets present 5. 
Accessory stylets absent ; procedi i sheath w A RE with 
central stylet only ; parasitic CARCINONEMERTES. 
Ocelli minute and usually numerous EMPLECTONEMA. 
Ocelli large, four in number ; body sitions . NEMERTOPSIS. 
Proboscis provided with stylets, intestine not dendroccelous 7 
Proboscis without stylets ; intestine dendrocalous ; pelagic 
PLANKTONEMERTES. | 
I :oboscis sheath without cecal appendages ; proboscis armed with 
single central stylet besides 2 ‘or more anon of accessory ao 
1 In addition to the marine Nemerteans here included, a representative of the 
fresh-water genus (Stichostemma) has been found in pools in the vicinity of Seat- 
tle, Washington. 
