12 IOWA STUDIES IN NATURAL HISTORY 
length and breadth measurements are nearly equal to those of the para- 
podium. 
The sete are all alike (figure 20). Each has a rather stout sub-apical 
tooth and two very fine sharp-pointed apical teeth. Posterior somites 
have two sete, anterior ones have three. The acicula is broader than the 
seta but no darker in color and is bent sharply at the apex, (figure 21). 
There is only one acicula to a parapodium and it comes to the surface at 
the base of the sete. 
The proventriculus and pharynx are both barrel-shaped and about equal 
to one another in length. The pharynx is reddish brown in eolor with 
the anterior margin much darker, and with a single anterior tooth. (Fig- 
ure 22) The proventriculus (figure 22) has the usual arrangement of 
glands which appear white in reflected light but by transmitted light 
appear black because of their opacity. In the figure these glands are 
represented as larger and farther apart than they really are. When the 
pharynx is protruded as above described it and the proventriculus to- 
gether extend as far as the fifth setigerous somite. 
Co-types are in the Museum of the State University of Iowa. 
SYNELMIS Chamberlin 
Synelmts simplex Chamberlin 
Synelmis simplex Chamberlin, (1919), pp. 177 to 179, pl. 28, figs. 1 to 5. 
Two small specimens were in the collection but identification 
was made more certain through comparison with much larger 
specimens collected by myself in Tobago. The genus and species 
were described from two individuals collected at the Paumotu 
Islands and I was much surprised to find that in no respects 
did they differ from the West Indian specimens enough to 
justify the erection of a new species. The eyes which Chamber- 
lin described as three or four on a side may be fused into a 
band considerably longer than broad and placed at an angle 
with the main axis of the prostomium. There is a small conical 
cirrus on the ventral surface of each palp near the anterior 
end, which Chamberlin did not mention. Chamberlin gives in 
his generic diagnosis ‘‘one pair of tentacular cirri’’ but this 
evidently means one pair on either side, for the latter is correct 
and it is so stated in the description of the species. There is 
an error in Chamberlin’s key to the Subfamilies and Genera of 
the Syllide, page 165, where he puts Synelmis under AA; B, 
‘‘tentacles and cirri articulated moniliform.’’ They are all as 
stated in his later description, ovate with a constricted base 
and a slender apex. 
The body is cylindrical with a very firm wall. In preserved 
