30 MARINE INVERTEBRATA OF GRAND MANAN. 



with lai-o-e teetli. It is frequent on the test of Ascklia calhsa, and sometimes on 

 Pcdens from deep Avater. 



Pkotula media, St., n. s. Tubes Large, C3lindrical, rather thick and strong, 

 marked with indistinct lines of growth, irregidarly and variably contorted, and 

 adhering throughout their length. Animal pale yellowish ; disk broad, mem- 

 branous, very thin and delicate, with a scalloped margin, and extending much 

 beyond the extremities of bristles of the seven segments it occupies. On the 

 succeeding 40 to 50 segments there are no long bristles, while those of the last 20 + 

 se"-ments are very long and hair-like. Branchial plumes moderately large, of a 

 very pale yellowish tint. The tentacula of each are about 36 in number, arranged 

 in a spiral of one turn and a quarter, with a thin raised membrane encircling their 

 bases witliin. These plumes usually drop oft' in specimens preserved in alcohol, 

 and disclose two black dots corresponding to the two plume-bases which look very 

 much like eyes. The tubes are often six inches or more in length, with a diame- 

 ter at the aperture of one-fifth of an inch. It is dredged on muddy and gravelly 

 bottoms in the coralline zone, attached almost invariably to dead valves of Bxten 

 Magellunkvs. It was very abundant at a spot directly under the 45th parallel of 

 latitude, half way between the equator and the pole, from which circumstance I 

 have derived its name, for want of a better. 



Sabella pavonina, Sav., Grube, Fam. der Ann., 88. Tubularia 2'>emcilhis, 0. 

 Fabr., F. G., p. 438 (in part). This species as found here is rather short and 

 broad, of a pale white color, with the tentacles (which are about 24 in number) 

 white below and brownisli towards their extremities. The tube is long, erect, 

 leathery, and evenl}^ coated with sand on the outside. It inhabits deep water. 



S. ZONALIS, St. Tubularia penidllu-^, 0. Fabr. (in part). Of a dark-brownish 

 color, with about 20 tentacula, which are colored with brown and white arranged 

 alternately in narrow zones. It is a more elongated species than the former. 

 Found in 4 f. among nullipores ; the specimens taken having their tubes thickly 

 coated with mud. 



Pectinaria Groenlandica,(?) Grube. P. Behjlca, curved var., Gould, Inv. Maes., 

 pi. i. f. i. Veiy common on sandy and muddy bottoms in deep water, and at low- 

 water mark on the sand-tiats of Fisher's Cove. 



lillMARA, St., n. g. 



This genus is nearest allied to Terehella, from which it differs in the following 

 characters. The body is elongated, and not suddenly thickened anteriorly, but 

 tapers regularly to the posterior blunt extremity. The setae, of both kinds, exist 

 on all the segments of the body (42 +) instead of the anterior ones only; the acicula3, 

 commencing at the second segment, being very long; and the uncinate setas, com- 

 mencing at the fourth segment, being bidentate in front, with a strong, sharp pro- 

 jection at the dorsal apex, and having no projections corresponding to the lateral 

 ones in TtrebeUa. (See Fig. 20.) The ventral shields are oblong, nearly touching 

 the lateral pinnae, and extend entire to about the 17th segment; where a median 



