MONOGRAPH OF THE AMPHINOMACEA, '227 



Hah. Eeefs ofF the north-east coast of Australia, Bayner (Mus. 

 Brit). 



Body somewhat elongately fusiform, narrower at each extre- 

 mity, about 2| inches long, and composed of 32 or 33 segments. 

 Beneath or on the ventral surface it is of a light brown colour, 

 but the back is violet and marked with a number of white lines 

 crossing each other in various directions. The caruncle is large, 

 extending to the sixth segment of the body. It is apparently 

 composed of three portions, which are almost separate from each 

 other. The centre portion, or crest, is detached from the lateral 

 portions throughout its whole length, except at the two extremities. 

 All three portions are strongly wrinkled. The setiferous tu- 

 bercles are prominent, the dorsal being encircled at the base 

 with a black ring. The branchiae arise from the fifth segment, 

 are placed upon the base of the dorsal setiferous tubercles, and 

 are composed of a tuft of short cirriform branchlets or filaments, 

 about from 20 to 55 in number. The anus is placed on the back, 

 on tlie twenty-second segment, and in the centre of a rounded 

 fleshy caruncle. The setae or bristles of both dorsal and ventral 

 tufts (fig. 5, a, b) are long, capillary, and sharply bidentate a 

 little way below the apex, which is simple, the tooth being sharp 

 and erect. The ventral setse (fig. 5, h) are rather shorter than those 

 of the dorsal tuft. The dorsal cirri are double, — one, the most 

 dorsal, is short and subulate, about the length of the branchial fila- 

 ments ; the other, the most ventral in position, is much longer, 

 and composed of two joints, the basal much the stouter of the 

 two. The ventral cirri are single, and about the same lengtli as 

 the most dorsal of the dorsal cirri. 



Only one specimen was brought to the Museum. It was 

 taken by P. Rayner,' Esq., Surgeon of H.M.S. 'Herald,' to 

 whom I have dedicated this fine species. 



Genus VI. Linophebus. 



Linopherus, Quatrefages. 



Amphinome, sp. Peters, Grube. 



Body linear. Head as in Amphinome. Caruncle very small. 

 Feet in two rows, apart. Branchiae cirriform, the cirri of which 

 they are composed being either simple or bifurcate. 



Sp. 1. LiNOPHEilTJS INCARUNCULATTJS. 



Amphinome incarunculata, Peter&; Grube, Beschr. neuer od. wenig be- 

 kannt. Amiplid. in Troschel, Archiv der Naturg. 18(50, )>. 77. 



