CONCHODERMA V1RGATA. 149 



of which one (h) is seated on the posterior margin of a 

 swelling, beneath the basal articulation of the first cirrus, 

 and this is the longest ; the second (y) is short and thick, 

 and is seated a little lower on the side of the prosoma, 

 (near to this, there are also two little pap-like eminences ;) 

 the third (*) is seated on the posterior margin of the pedicel 

 of the first cirrus, above the basal articulation ; the fourth, 

 fifth, and sixth (j, k, I) in similar positions on the pedicels 

 of the third, fourth, and fifth cirri. These three latter 

 filaments are shorter and smaller than the first three. 

 At the base of the second cirrus, which has no proper 

 filament, there is a swelling as if one had been united to it. 



Mouth. — Mandibles, with the basal edges of the five 

 teeth pectinated by minute, short, strong spines on 

 one side; inferior angle extremely short. In one 

 specimen, there was a minute pectinated tooth between 

 the first and second; in another, the second tooth was bifid 

 on its summit ; in another, the fourth was rudimentary. 



Maxillce, with five steps : sometimes each step com- 

 mences with a spine rather larger than the others ; at the 

 upper angle, there are two large unequal spines (neither 

 pectinated,) with a third longer and thinner, seated a 

 little below. Outer maxilla (PI. X, fig. 16), simple. 



Cirri, with twice as many segments in the sixth cirrus as 

 in first; spines on the first and second cirri doubly serrated. 



Colours (when alive). — Capitulum and peduncle grey, 

 with a tinge of blue, with six black bands, tinged with 

 purplish brown. The two bands near the carina become 

 confluent on the peduncle, and sometimes disappear ; 

 the carina is edged, and the interspace between the 

 two scuta, coloured with the same dark tint. The whole 

 body and the pedicels of the cirri are dark lead-colour, 

 with the segments of the cirri almost black : in some 

 specimens, the colour seems laterally abraded from the 

 cirri. Ova white, becoming in spirits pinkish, and then 

 yellow. The dark bands on the capitulum and peduncle 

 become in spirits purple ; but are sometimes discharged ; 

 the general grey tint disappears. Professor Macgillivray 



