282 ANNELIDA POLYCH^TA ANDREWS. 



fera Pag. to which they present great similarity. The eggs or young 

 were attached ventrally to about 16 segments, commencing usually on 

 the fifteenth, but in 11 specimens studied considerable variability was 

 observed. In most cases no elongated setic were present upon the 

 segments bearing young. 



AUTOLYTUG (Grube) Marenzeller. 



Autolytvis varians Verrill. 



Verrill, New Eugland Annelida, p. 320. 



Sexual forms, i and ? , were taken at the surface, which are prob- 

 ably identical with the forms described by Professor Verrill from the 

 New England coast, June. 



PROGERIA (Ehlers) Marenzeller. 

 Proceraea tardigrada Webster. 



Webster. Annel. Chset. of Virginian Coast, pp. 27-30. 



]Sron-sexual forms, many of them in process of division, were dredged 

 in great numbers amongst sponges, near Green Eock, in 3 to 4 fathoms, 

 and sexual forms were taken in the tow net. From a comparison of 

 these various forms there seems no doubt that the Procerwa cerulea of 

 "Webster was merely the female of P. tardigrada, the eggs of which r.re 

 of a sky-blue color and give tliis color to the body before they are laid. 

 Subsequently they are carried about in three delicate sacks on the ab- 

 domen, between the sixth and thirty second segments. 



This 9 has a dark dorsal, transverse band upon somites, 3, G, 8, 9, 

 13, 17, 21, 25, 27, 29, 32, 35, 38, 42, 46, 49, 51, 53, 56, 57, 70, 71, 74, 

 and 77, near anterior edge of each. Each parapodium bears ventrally 

 a dark-red spot. The large lateral and swollen dorsal eyes are concealed 

 by pigmented areas. Base of dorsal cirrus red as far as twenty-fourth 

 somite. Body convex dorsally, flat ventrally, and laterally expanded 

 with long parapodia, sette and dorsal cirri in the region between sixth 

 and twenty-seventh somites. Taken in August. The nonsexual form 

 has pigmental bands like those of the ? but arranged according to a 

 definite law or general rale to which the bands in the $ conform also ; 

 bearing in mind that the 9 is formed as a cut-off' part of the nonsexual 

 stage, separating almost always just posterior to thirteenth somite and 

 hence having thirteen less somites than that stage. In one hundred 

 and ten individuals carefully studied only three had the bud formed 

 just posterior to fourteenth somite; seventy-nine had an evident bud just 

 pot^terior to thirteenth somite. 



Baving tabulated the arrangement of the colored bands in these 

 one hundred and ten individuals there results the general rule that the 

 bands occur upon the third and fourth somites, then upon every other 

 or alternate one up to and including the twelftb, then (in the region of 



