NOTES ON THE NAIDIFORM OLIGOGH^TA. 349 



capillary, and longer than the first five segments. There are 

 twelve to fifteen in the bundle. The other dorsal setae are capil- 

 lary, and of about one fifth the length of the anterior ones. 



2. P. macrochaeta, mihi (PI. XXVI, fig. 1). 



The prostomial tentacle is much longer than the peristomial 

 segment. 



Eyes as in P. parasita. 



The ventral seta bundles of the second and third jsegments 

 consist of two to three setse, and those of the other segments 

 of two to five setse. 



The setse in the three most anterior dorsal bundles are ail 

 capillary; two to five of these are very long, longer even than the 

 long setse in P. parasita, while the other four to six are shorter 

 than the other dorsal setse. The remaining dorsal seta bundles 

 usually contain two setse, one rather longer than the other. 



I found no individuals with generative organs, and none 

 exhibiting gemmation. 



[The long setse are frequently found thrown forward so as to 

 partly encase and protect the head when the worm forms for 

 itself a temporary tube. They are also used to strike the water 

 in swimming. — E. R. L.] 



Paranais, Czerniavsky (see woodcut). 



Three cephalized segments in addition to the peristomial 

 segment remain well marked in the fully grown head,, 



There is no prostomial tentacle. 



There are no capillary setse; all the setse (dorsal as well as 

 ventral) are crotchet-shaped. 



There are no branchial processes. 



Eyes may be present or absent. 



1. P. uncinata, Oersted. 

 According to Czerniavsky the Ophidonais uncinata of 

 Oersted belongs to the genus Paranais. 



2. P. littoralis, O. F. Muller (Pis. XXVI and XXVII, 



figs. 2 to 6). 

 This species is by no means well known. It is recorded by 



