438 EUNICE NORVEGICA. 



directed upward and slightly forward. The wings leave the neck a little above the point 

 of diminution and are often injured distally. They are of varying degrees of yellow or 

 brown in young specimens. There is little that is distinctive in these hooks in the group 

 to which this species belongs. 



The first foot has a long dorsal cirrus, and a considerable ventral cirrus — the two 

 arising close together, so that but a small space remains for the two spines and 

 the dorsal and ventral bristles. The dorsal cirri of the first five feet, indeed, are 

 conspicuously longer, thereafter they diminish. The ventral cirri of five or six of the 

 feet in the same region are likewise proportionally long. 



At the tenth foot (Plate LXXIV, fig. 1) the dorsal cirrus is still proportionally 

 long, and bears from its inner or dorsal base a single branchial process not half its 

 length. Occasionally there are two. The setigerous region is bluntly conical, and is 

 supported by two strong black spines (pale in young specimens). Superiorly are long 

 simple bristles (Plate LXXXIII, fig. 9) and a series of brush-like forms (Plate 

 LXXXI1I, fig. 9 a), while ventrally are the compound (Plate LXXXIII, fig. 9 b) or falcate 

 bristles. 



At the twentieth foot the chief distinctions are the diminution in the dorsal cirrus, 

 the branchia being bifid (or it may be trifid), and the increase in the depth of the dorsal 

 cirrus, which has a thick cushion-like aspect. 



In the examples brought from Norway by Canon Norman the tenth foot (Plate 

 LXXIV, fig. 11) has a branchia with four divisions. Twentieth foot (Plate LXXIV, 

 fig. 11a) has six divisions to the branchia. The falcate bristles of these are represented in 

 Plate LXXXIII, fig. 8, and a posterior hook in Plate LXXXIII, fig. 8 a. Teeth and 

 mandibles of this form are shown in Plate LXIII, figs. 4 and 4 a. 



In a series of small examples dredged by Canon Norman in shell-gravel in Norway 

 the branchiae commence on the third foot. On the eighth foot the process is still simple. 

 The twelfth foot has four divisions, whilst the twentieth (Plate LXXIV, fig. 11a) has six 

 or seven. At the thirtieth foot are five, and at the thirty-ninth (last) a simple process. 

 The maximum number of filaments of the branchiae is nine or ten. They form tubes 

 amongst the shell gravel. Considerable variation, indeed, is present. The dental 

 apparatus of this small variety appears to agree with the type. 



In a form of medium size in a very imperfect state of preservation, dredged in the 

 ' Porcupine ' Expedition of 1870 at a depth of 539 fathoms in grey mud, certain 

 features diverge from the type above mentioned. Amongst these are the occurrence of 

 black spines, the comparatively feeble development of the branchiae, and the slight 

 articulations of the dorsal cirri. On the tenth foot the bifid branchia is little more than 

 a third the length of the dorsal cirrus, and it is slightly shorter at the twentieth foot, 

 one of the divisions being rudimentary. A single short filament only occurs on the 

 thirtieth foot, and it disappears before the fortieth. This form does not appear to lean 

 either to the Eunice tovquata of De Quatrefages or other type, and may require 

 separation. The material in hand, however, does not warrant this step. 



On the third foot of an example a long process projected from the posterior aspect 

 of the setigerous region — evidently an abnormal papilla of the cutaneous tissues. 



Pood. — In the intestine of examples from Norway were vast numbers of spicules 



