6 IOWA STUDIES IN NATURAL HISTORY 
without color and so translucent as to be easily overlooked. The dorsal 
cirri have heavy cirrophores but their terminal joints are small. 
A parapodium from near the middle of the body (figure 8), has two 
acicule, one extending into the setal lobe and the other into a small 
rounded dorsal lobe which must be the much degenerated notopodium and 
bears no setw. The cirrophore of the dorsal cirrus is very large, broader 
at the base than is the setal lobe and is about as long as this lobe. At 
the apex it carries the small lanceolate dorsal cirrus. The setal lobe is 
obliquely truncated at the apex and the sete are all alike each with a 
stout shaft tapering to a bluntly rounded apex. In the parapodium 
figured those dorsal to the acicule had a sub-apical tooth, those ventral 
Lo it had not. I am uncertain if this is the case in all somites. Each 
seta has, arranged basally from the apex, rows of flat plate-like teeth 
with finely denticulated edges. (Figure 9) There is a very small ventral 
cirrus. 
The specimen retains one anal cirrus in form like the dorsal but 
shorter and more slender. 
Collected at Barbados. 
The type is in the Museum of the State University of Iowa. 
E\VARNELLA Chamberlin 
Evarnella trimaculata new species 
A single specimen collected at Station 101. The body is 15 mm. long, 
3 mm. wide without the parapodia, has 35 somites and 15 pairs of elytra. 
It is characterized by three prominent brown patches on each elytron and 
a brownish band on each inner elytral border. 
The prostomium (figure 1) has nearly a square outline with peaks blunt 
and radiating. The anterior eyes are the larger, situated dorso-laterally 
at the bases of the peaks. The posterior eyes, much smaller and very 
black, lie near the posterior margin. 
The median tentacle is lost but its cirrophore is large and fills most of 
the space between the peaks. The cirrophores of the lateral tentacles 
extend about as far as that of the median. Each lateral tentacle narrows 
abruptly at about its middle forming a long slender filamentous terminal 
half. The palps are unusually short, hardly more than twice as long as 
the lateral tentacles. 
Except for size the elytra are all alike. They are translucent white 
with smooth contours and a large number of small blunt spines are 
scattered over rather less than one-quarter of their area, toward the 
anterior border. (Figure 2). Each elytron has three pigment patches, 
one on either side of the point of attachment of the elytrophore and one 
near the outer margin. When the elytra are in place the pigment patches 
extending in a row outward and slightly posteriorly in each somite are a 
marked feature of the dorsal pigmentation. In addition to these each 
elytron has a band of pigment running parallel to its inner margin with 
more or less pigment shading away from this band on either side. 
A parapodium from near the middle of the body (figure 3) has a 
