272 SERTULARIID^. 



common along the Yorkshire, Durham, and Northumber- 

 land coasts ; of large size (2 feet long) at Peterhead and 

 Wick ; Norfolk (C. W. P.) : in the Bristol Channel (A. 

 M. N.) : various points on the Irish coast. 



[Ostend, very abundant, not far from the shore (Van 

 Ben.): mouth of the Elbe, 2 feet in length (Kirchenpauer) : 

 La Charente inferieure, pretty common (Beltremieux): 

 Henley Harbour, Labrador, in 7 fath. (A. S. Packard, 

 jun.): Massachusetts Bay (Agassiz).] 



8. S. FUSCA, Johnston. 



SERTULARIA NIGRA, Jameson, Wern. Mem. i. 565; Johnst. B. Z. (1st eel.) 128. 



DYNAMENA NIGRA, Flem. Br. An. 545. 



SERTULARIA FUSCA, Joknsf. B. Z. (2nd ed.) 70; woodcuts, 57. fig. 6, 69. fig. 



10 c, 70. fig. 11. 



NIGELLASTRUM FuscuM, Gray, Cat. Br. Mus. Radiate, 75. 

 DIPHASIA FUSCA, Affass. N. H. U. S. iv. 355. 



Plate L. fig. 2. 



SHOOTS rigid, pinnate, lanceolate, very sparingly branched, 

 of a blackish-brown colour, highly varnished; STEM 

 rather stout, lined longitudinally, jointed at distant 

 intervals, with a row of alternate calycles on each side ; 

 pinnae alternate, several springing from each internode 

 of the stem, simple, attenuated at the base ; HYDROTHEC^E 

 closely set, and bent alternately to opposite sides, so as to 

 give a quadrangular appearance to the pinna, very small, 

 adnate, with a ivide oblong mouth; GONOTHEC^E pear- 

 shaped, subpedicellate, smooth, borne on the upperside 

 of the pinnae. 



Height of well-grown specimens about 3 inches. 



THE calycles in this species are truly biserial, but they 

 bend alternately in opposite directions, forming a zigzag 

 line, and have much the appearance of being arranged in 

 four rows. They are crowded and completely adnate. 



