of the Virginian Coast. 



239 



the lower bundle. The branchiae are simple, and begin 

 from the 10th to the 13th setigerous segment. Length, 9°''°. 

 Number of segments, 75. 



(e.) We have next five antennae, the external in some cases 

 being minute papillae, in others having attained their 

 normal (relative) length. On small specimens the division 

 of the head into palpi is not complete. Branchiae begin 

 on any segment, from the 10th to the 23d, according to the 

 size of the specimen. Eyes, always two. 



On specimens from 10 to 20"°" in length, having more 

 than 10 and less than 17 non-branchiated anterior seg- 

 ments, the branchiae are usually bifurcate. 



The jaws of the youngest forms correspond perfectly 

 with those of adults, save that the support (Trager) is 

 relatively longer, and with a narrower posterior margin. 

 In this, as in all other respects, a complete gradation can 

 be established. — My figures of jaws all show four teeth 

 on the large denticulated jaw pieces (Zahne, Ehlers), as 

 described by Quatrefages, instead of three, given by 

 Ehlers. 



The comb-like setae of the adult are not found on the 

 youngest forms. I have never seen them on specimens 

 with less than three antennae, nor on those without bran- 

 chiae. 



The forms under (c) will be seen to correspond very 

 closely to Nemafoneries oculaia Ehlers (BorstenwUrmer, p. 

 374, pi. 16, figs. 19-22), while (d) is very close to Amphiro 

 Knbg. (Armulata Nova Ofvers of K, Vet-Akad Fork,, 1864 

 p. 565 ; also Fregatien Eugemen^s Resa, pi. xvii, f. 26). 

 Kinberg says in his generic diagnosis : " Branchiae pect- 

 iniformes vel subpectiniformes," and for the most part 

 (d) has simple branchiae, but on one specimen the branchiae 

 were found divided, the second division being represented 

 by a small but perfectly distinct papilla. Possibly, then, 



