of the Virginian Coast. 



227 



Number of segments, from 24 to 30. Length, 3 to 4°^. 

 Greatest diameter, V^. 



Specimens of the mature female occurred through July 

 and August. They are quite delicate, and were very 

 uneasy, swimming about constantly and rapidly, with a 

 quick, undulatory motion. All the features mentioned 

 above seem to originate after separation has taken place. 

 I often found the stem form with eggs giving the charac- 

 teristic purple color in the posterior segments, and with 

 the separation carried so far that the slightest touch served 

 to complete it, but in only one case did I find antennae or 

 tentacular cirri formed, or the peculiar outline of the head 

 indicated, before separation. In this one specimen the 

 antennae and tentacular cirri were mere buds, the first 

 segment was without feet ; but the eyes and capillary setae 

 had not appeared. 



Male. Ko adult male was found. The posterior seg- 

 ments of the stem often contained very fine granular mat- 

 ter, which I believe was the male element; it gave a very 

 bright orange color to the segments in which it was found. 

 No other change had taken place in these segments, though 

 the division was often nearly complete, as mentioned above 

 in the case of the female. 



This species was common on shells, etc. Dredged, 4 to 

 12 fathoms. 



Progeria (Ehlers) Marenzeller. 



Ehlkrs. Borstenwurmer, p. 256. 



Marknzellkr. Zur Kentniss der adriatischen Anneliden, zweiter Bei- 

 trag, p. 37. 



For remarks on this genus see under Autolytus. 



Progeria tardigrada n. sp. 



Head, quite thick, transversely oval, convex ; head and 

 palpi together nearly circular ; palpi much the same as 



