326 POLLICIPES SPINOSUS. 



the largest. On the other hand, the lower part of the 

 peduncle, from the first formed scales having been worn 

 away, is often quite naked. From this cause, and from 

 the continued and irregular growth of some of the lower 

 scales, the rows in this part of the peduncle, generally 

 become irregular. The surface of attachment is broad. 



In a half-grown specimen, with a capitulum only ^ths 

 of an inch long, all the lower valves were considerably 

 larger in proportion to the scuta, terga, and carina, than 

 in full-grown individuals. 



Size and Colours. — Length of capitulum in the largest 

 specimen, ^ths of an inch; breadth, slightly exceeding 

 the length. Colours after having been long in spirits — 

 upper part of sack, thorax, pedicels of cirri, and penis, 

 clouded with fine purple ; cirri banded with the same ; 

 exterior convex surface of the outer and inner maxillae 

 and palpi dark purple ; prosoma yellow. The membrane 

 of the peduncle and of the capitulum is dirty yellow, with 

 bands of purple between some of the valves. 



Filamentary Appendages, none. Ovigerous fraena placed 

 near the middle of the basal margin of the scuta ; small, 

 semi-oval, with an elliptical ring of bead-like glands ; 

 glands seated on long footstalks. 



Mouth. — Labrum far produced towards the adductor 

 muscle ; upper part highly bullate, nearly equalling the 

 longitudinal diameter of the rest of the mouth, and very 

 slightly overhanging the lower part ; crest with very 

 minute bead-like teeth. 



Palpi, with their inner margins considerably excised, 

 most thickly clothed with spines. 



Mandibles, with three strong teeth, two unequal-sized 

 small teeth being placed between the first and second, 

 thus making five altogether; inferior angle broad, pec- 

 tinated. 



Maxillce, with its edge broad, straight, bearing about 

 twenty pairs of spines, shorter than the large upper spines. 



Outer Maxilla, with the bristles in front, continuous, 

 and without any notch ; exterior surface with a promi- 



