1905.] NATURAL SCIENCES OF PHILADELPHIA. 859 



Small papillte or cirri are found just l^eneath the setigerous tubercles 

 of somites VI, VII and VIII. 



Setae (fig. 19) have very short wings and a prominent fringed terminal 

 pennant with a distinct knee at the place of its origin from the body 

 of the seta. Abdominal uncini (fig. 21) resemble those of A. afjinus 

 quite closely, but those of thoracic tori (fig. 20) differ decidedly in the 

 shape and proportions of the base and the number and arrangement 

 of the teeth on the crest. 



Some of the specimens are colored a nearly uniform reddish-brown, 

 absent, however, from the gills and tentacles; and two are accom- 

 panied by portions of rather fragile tubes of fine mud. 



This species was taken at the following stations : 4,227, Naha Bay, 

 Behm Canal, 62-65 fathoms and on a bottom of dark green mud and 

 fine sand; type locality 4,245, Kasaan Bay, Prince of Wales Island, 

 95-98 fathoms, dark green mud with fragments of shell, rock and 

 sand; 4,253, Stephens Passage, 131 fathoms, rock and broken shells. 



Explanation of Plate XLVI. 



Amphicteis alaskensis — figs. 1 to 4. 



Fig. 1. — Anterior end of type seen from tlie dorsum. X 7. 

 Fig. 2. — Parapodium of XXV. X 32. 



Fig. 3.— Middle-sized paleolus; a, tip of another. X 32. , ^ , ,, 



Fig. 4.— Three uncini from X; a, dorsal, b, middle (somewhat foreshortened), 

 and c, ventral. X 585. 



Amphicteis glabra — figs. 5 to 8. 



Pig 5 — Dorsal view of anterior end of cotype. X 12. 

 Pig' 6.— Parapodium of XXV. X 32. 

 Fig. 7. — Middle-sized paleolus. X 45. 

 Fig. 8.— Uncinus from X. X 585. 



Melinna denticulata — figs. 9 and 10. 



Yisr 9 —Uncinus with 3 teeth above the ligament process from X. X 585. 

 Fig! 10.— Uncinus with 4 teeth from the same torus; the anterior end of the base 

 is broken. X 585. 



Artacama conifera — figs. 11 to 13. 



jTig. 11. — A broad-bladed seta from X._^ X 585. 

 pjg_ 12. — A narrow-bladed seta from X. X 585. 

 Fig. 13. — An uncinus from X. X 800. 



Loena nuda — figs. 14 and 15. 



Fig. 14. — Seta from X. X 585. 

 Fig. 15. — Uncinus from X. X 800. 



