THE NEMERTEANS OF PORTO RICO. 
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depressed. Ocelli small, about 4 or 5 in single series on each side of the head. Lateral fossae large 
and long Color dark, smoky-brown or nearly black, crossed by about 20 white rings, which become 
narrow white lines in contraction; neck usually with a wider white band; head with white edges and 
a median white dorsal spot. Under side whitish. Length, in extension, 35 to 50 mm.; diameter, 
about 1 to 1.5 mm. Low-tide, among corallines.” 
7. Micrura or Lineus sp. 
A slender species with long, slender head, long cephalic furrows reaching hack slightly farther 
than anterior end of mouth. Proboscis large in size and nearly as long as body of the worm. Length 
of the alcoholic specimen 140 mm.; body rather slender, with rounded margins. 
One specimen with extruded proboscis from Ensenada Honda, Culebra. Two headless fragments 
from the same locality may be referred to the same species. The color of all the specimens has prac- 
tically disappeared. 
8. Cerebratulus sp. 
The color of the single specimen, preserved in alcohol, has disappeared. Length of the body 
about 50 mm. ; moderately slender, especially in the oesophageal region. The head is remarkably long, 
slender, sharply pointed, and flat. Mouth large; its anterior end reaches as far forward as the posterior 
ends of the cephalic furrows. Ensenada Honda, Culebra. 
