656 A. E. y err ill — Turhellaria, N'emertina, and 



setae, and a small fascicle (12 to 15 on the 3d segment) of long, very 

 acute dorsal setse; the 4th and 5th segments are rather longer, with 

 long series of strong, bent, yellow, bearded uncini (about 30 on the 

 4th segment) ; 6th to 8th segments longer; 9th much longer, usually 

 constricted behind the tori; 10th to 15th and following segments are 

 very long, narrowed anteriorly, and have prominent posterior tori. 

 Anal segment funnel-shaped, the border surrounded by 30 or more 

 subequal slender papillae. 



The capillary setae are of three kinds. Usually there are 6 to 8 

 longer and larger, rather strong, smooth, very narrowly bilimbate 

 ones, ending in long, slender, flat, flexuous, minutelj^ denticulate tips, 

 and 4-6 shorter and much more slender ones, with tine capillary tips, 

 not limbate; with these there are a few very slender, bipennate 

 setae, slightly flattened and widened distally, and finely spinulose to 

 the acute tips, the spinules projecting considerably. 



The uncini of the middle region are stout and bent back strongly, 

 with a large, sharp, somewhat incurved rostral hook, and 4 small, 

 graduated, appressed apical hooks, of which the 4th is very minute; 

 apex and sides are strongly striated distally. The beard is long and 

 curved strongly backward, it arises from just under the rostrate 

 hook and contains but few fibers. The bulb of the stem is well 

 developed. 



Color, in life, bright red, more or less distinctly banded with 

 bluish at the postei'ior end of most of the segments; posterior half of 

 many segments bright red; 4th with a definite bright red ring. 



Length, in life, over 150'"™; diameter, 4-5"""^. 



Found at Castle Island at low-tide, in shell-sand. 



Clymenella Verrill, 1873. (Sens ext.) 



Axiothea Malmgren, 1865, type A. catenata; (non Pasc, Colerp., 1864). 

 Clymenella Verrill, 1873. Eep. on Invert, of Vineyard Sound, etc., pp. 49, 314, 



pi. xiv, and Annual Eep. U. S. Com. Fish and Fisheries, 1874, pp. 343, 608, 



pi. xiv, figs. 71-73. Type, C. torquata (Leidy). 



The genus Clymenella originally had for its special character, to 

 distinguish it from Axiothea, the presence of an evident collar, with a 

 wide, free anterior edge, arising from the 4th setigerous segment. 

 In all other characters it agrees well with Axiothea Mgn., in which 

 no such collar has been described, I have since examined authentic 

 specimens of Axiothea catentata, the type of the genus Axiothea, 

 sent from the Museum of Copenhagen, and found that it has a 

 narrow collar or fold, both on the 4th and on the 3d setigerous seg- 



