34 MARINE INVERTEBRATA OF GRAND MANAN. 



Pinnas small ; ventrals with the setas longest and most numerous ; dorsal and 

 ventral cirri on the whole length of the animal. Head with short tapering ten- 

 tacula; eyes small but conspicuous, posterior ones nearest each other. Proboscis 

 with a ring of minute denticles almost encircling its base, but interrupted above 

 by a smooth space, on which there are two prominent denticulated papilla); also 

 with four radiating ridges of denticles and an inferior denticulated patch, at its 

 extremity. Maxillae slender, much curved. Length, 6 inches; breadth, 0.25 inch. 

 Found at low-water mark. Described from a Massachusetts Bay specimen, those 

 from Grand Manan being lost. In Fig. 23, a represents a pinna of the twentieth 

 ring ; 6, one of the posterior pinnae. 



-N. GRANDIS, St., n. s., Fig. 24. Large, broad, thick anteriorly, and somewhat 

 flattened posteriorly. Body dark brown, cupreous above, with the pinnae lighter 

 colored. Rings about 180 in number. Head small; eyes four, inconspicuous; 

 tentacula very small, equalling in length only that of the very thick palpi ; tenta- 

 cular cirri tapering to slender threads, the longest equalling in length the first 

 three segments of the body. Maxillae broad and strong, dentated. Dorsal pinnae 

 with large subcordate lamellae, which have short cirri above in the first forty seg- 

 ments. Length, 17 inches; breadth, 0.5 inch. At low water, under large stones. 

 It is, perhaps, N. grandifolia of Leuckart (1. c. 207), but cannot be that of Rathke, 

 who states his species to be Heteronereis arctica of Oersted, Gronl. A. D., pi. iv. 

 f. 51, which is very different from our species. 



In Fig. 24, a represents one of the anterior pinnaa ; b, one behind the middle of 

 the body. 



ENONELLA, St., n. g. 



Body elongated, much compressed, tapering posteriorly. Head small, subovate, 

 terminating anteriorly in two short tentacles placed transversely, one on each side. 

 Neck somewhat contracted. Pinna with a strong, short, simple dorsal cirrus, 

 above which is a hard, arcuated knob or mamilla, concave towards the cirrus. 

 These mamillaa in their succession form something like two keels to the body. 

 Strong muscular fibres proceed from them, and they are probably of use to the 

 animal in working through the sand, which it does with great celerity. Setae 

 falcigerous, long and numerous, in one bundle to each pinna. This genus wants 

 the folded cirrus (branchia) of CEnone, and differs also in possessing tentacles and 

 superior lateral cirri. See the figures. 



ENONELLA BICARINATA, St., n. s., Fig. 25. Body very much elongated, subulate. 

 Eyes small, scarcely perceptible from the thickness of the skin over them. Color 

 uniform pale-greenish yellow when alive, but in preserved specimens dark-brown. 

 Length, 1.5 inch; breadth, 0.09 inch. Found in fine sand at low-water mark, at 

 High Duck Island. 



Figure 25. a, head above; J, the same below, showing the mouth; c, pinnae, 

 etc., from above; d, side view of a pinna. 



EUNICE OERSTEDII, St., n. s. Depressed, but narrow; head small, with the three 



