44 Smith and Marger — ;S'^. George^ Banks Dredgings. 



G-rymaea spiralis Verriii. 



Am. Journal of Science, III, vol. vii, p. 407, fig. 2, and plate V, fig. 4, April, 18T4. 

 Plate IV, figure 1. 



Body long and slender, spirally coiled, composed Fig. i.* 



of over 150 segments, of which about 120 bear fas- 

 cicles of slender set:*. Branchiae long filiform, two 

 or three times the diameter of body, arising in three 

 clusters on each side, easily detached and often par- 

 tially absent. Setae on the first six or seven seg- 

 ments a little longer than the following ones. Gen- 

 eral color dark red. Tube composed of firmly 

 cemented mud and sand, coiled in a double spiral, 

 the two halves revolving in opposite directions. 



Also dredged, in 1872, ofi' Grand Menan Island, 

 Bay of Fundy, in 60 fathoms; and in 187;^, off Casco 

 Bay, in 90 fathoms, mud ; and in 80 fathoms on Jeffrey's Bank. 



? Potamilla neglecta Maimgren. 



(Efversigt af Kongl. Vet.-Akad. Forliandlingar, 1865, p. 401, plate 27, fig 84. 

 Sabella neglecta Sars, Reise i Lofot. og Finm., p. 83 (t. Maimgren). 



This species was very abundant at localities d, h, ^, q, and also 

 occurred in 110 fathoms (locality o). 



The tubes are long and tough, covered externally with sand. One 

 specimen from Le Have Bank, 45 fathoms (locality A), had a large 

 number of young ones within the tube, adhering to its inner surface. 

 —A. E. V. 

 SpirorblS valida Verrill, sp. nov. 



Tubes much larger than usual in the genus, round, strong, thick, 

 opaque, white, transversely wrinkled, rather rapidly enlarging, sinis- 

 tral, or coiling in the same direction with the hands of a watch ; in 

 some specimens, found attached to flat shells, the tubes form low, 

 rapidly enlarging spirals of several turns, the last whorl enveloping 

 and concealing the others externally, except near its termination, 

 where it rises obliquely upon the preceding one, but leaving a broad, 

 shallow umbilicus in which the previous whorls are visible ; in other 

 specimens, attached to convex univalve shells {Turritella erosa, etc.), 

 the whorls rest upon the upper side of each of the preceding ones, 

 forming an elevated and often somewhat irregular spiral, increasing 

 in size upward, with a small umbilicus, and usually with the last part 

 of the upper whorl slightly free from the preceding one and ascending 



* Tube of Grymoea spiralis, natural size. 



