226 



Annelida CTweUypoda 



ridum has been examined by any one since it was described 

 by Claparede. The extent of the projecting portion of the 

 palpi is somewhat variable, l)ut if in Claparede's figure 

 (pi. 14, fig. 1), a curved line be drawn, passing just in front 

 of the origin of the lateral antennae, terminating on either 

 side opposite the anterior (minute) eye on that side, the 

 usual condition will be represented. Add,*that though 

 the anteunse often are as given by Claparede. in some spe- 

 cimens, the central antenna is longer than the lateral, some- 

 times as long as the first dorsal cirrus ; also, that while 

 both kinds of anal cirri (Clpd. 1. c, pi. 14, f. i a) occur, I 

 have never seen both on the same specimen. 



Sexual Forms. 



Female differs from the stem form in the following 

 points : the head is very short, length to breadth as 1 to 2J ; 

 middle third of auterior margin carving sharply back- 

 ward, the antero-lateral portions appearing as rounded 

 projecting lobes. 



Antennae, both median and lateral, arise from the an- 

 terior margin of the head ; they are equal in length, being 

 much shorter than those of the stem form. 



Anterior eyes very large, posterior pair a little within 

 the anterior, but nearly touching them. The anterior 

 minute eye-specks of the stem form not seen. 



The tentacular cirri, and dorsal cirri of the first segment, 

 bear the same relation to the antennae as in the stem form. 



The capillary setae are very long, beginning on the 4th, 

 5th, or 6th segment; not found on the last 4 to 7. Feet 

 much swollen at base. 



Eggs, very large, generally crowded, and then irregu- 

 larly polygonal, otherwise spherical, their diameter about 

 one-half the width of the body ; of a dark purple color, 

 with an eccentric clear nucleus. 



Color of the body determined by the eggs, wherever 

 they exist ; elsewhere the same as in the stem form. 



