'°189ll'''] PROCEEDINGS OP THE NATIONAL MUSEUM. 30l 



parede (Beobaclitiingen, Xorinandie, 18G3) as well as larvie like those 

 iu PI. VI, of the above-cited work, but Laviug only smooth setai except 

 iu certain older specimens. 



A Mitraria was occasionally observed and reared to a stage having 

 nine somites and a single row of uiicini, numerous upon the middle 

 somites. The shape of these uncini suggests what is found in the adult 

 Ammochares, but though these Annelids were kei)t in aiiuaria lor three 

 months no fertilized eggs were obtained, and so the question is an open, 

 one as to the reference of Mitraria to Ammochares. 



Polygordius larvie, having red eye spots and a row of red and of yel- 

 low areas, occur at certain periods, somewhat abundantly.* 



EXl'LANATION UF I'LATES. 



Plate xii. llarmothoe aculeata, sp. nov. 



Fig. 1. Side aud face view of veutral .seta and 8ide view of dorsal acta. 



Fig. 'i. Part of posterior edge of oue of larger elytra. 



Fig. :?. rarapodiiim. 



Fig. 4. Dorsal view of head aud exteuded proboscLS. 



Fig. 5. One of smallest elytra. 



Plate xiii. Eunice ornata, sp. uov. 



Fig. 0. Dorsal view of anterior end, from living specimen. 



Fig. 7. Jaws r' r- r' r* on right side ; V I- P I* on loft side ; L, unpaired piece on left 



side; V, ventral pieces; D, main dorsal jaws. 

 Fig. 6. Dorsal view of posterior end, living specimen. 

 Fig. y. Fourth parapodiuiu on right side. 

 Fig. 10. Four setic from parapodium of forty-fifth .somite. 

 Fig. 11. Parapodium of forty-fifth somite. 

 Fig. 12. Parapodium of seventeenth somite, 

 p-ig. 13. Blunt seta of veutral part of parapodium of forty-fifth somite. 



Plate xiv. Diopatra magna, sp. nov. 



Fig. 14. All jaw pieces; letters as in Fig. 7. 



Fig. 1."). Parapodinm of fourth somite, right side. 



Fig. Itj. Right parapodium, posterior to two hundredth somite. 



Fig. 17. Right parapodium of seventeenth somite. 



Fig. IS. Posterior end, dorsal view. 



Fig. I'J. Three seta- of auterior somite aud tip of largo seta from fortieth somite. 



Fig. 20. Side view of anterior end of body. 



Plate xv. 02)heUna ar/ilis, sp. nov., and roli/dora commeunaliti, sp. nov. 



Fig. 21. Side view of entire auimal ; live specimen. 



Fig. 22. Side view of expanded branchial apparatus ; A, auterior, and P, posterior. 



Fig. 2;?. Extended proboscis. 



Fig. 24. Dorsal view of auterior end, from living specimen. 



• I may here add a list of a few Polych;etje collected at the mouth of the Chesa- 

 peake, at Lynnhaven, in April, 1838, Si'phthya biicera Ehlers, Eugli/ccra dibranchiata 

 Vcrrill, Scolnplos robustns Verrill. Scoloplos fragilia Verrill, Ophelia simplex Leidy, 

 Hydruides dianthus Verrill. 



