267_ 



the peduncle, and composed of about 14 articulations. Inferior antennae 

 nearly of same length as the superior, the 2 outer joints of the peduncle 

 rather slender, and about equal-sized, flagellum half the length of the peduncle. 

 Anterior gnathopoda comparatively rather strong, meral joint but little 

 produced at the end inferiorly, propodos about the length of the carpus, 

 and scarcely narrower, oblong oval in form, with 2 small denticles on the 

 inferior edge. Posterior gnathopoda strongly developed, propodos about the 

 length of the 3 preceding joints combined, oblong quadrangular in form, though 

 slightly expanded distally, palm somewhat oblique, and about as long as 

 the hind margin, from which it is defined only by an obtuse angle armed 

 with 2 spinules, its edge smooth, with only a row of small bristles Pereiopoda 

 of rather robust structure, the first 2 pairs but little unequal, the 2 posterior 

 pairs with the basal joint unusually narrow, oblong in form, and scarcely 

 exceeding half the length of the remaining part of the leg, meral joint 

 somewhat expanding, and produced to about the middle of the carpal one. 

 Last pair of uropoda with the basal joint nearly as long as the other 2 

 combined, and armed with 4 very small denticles. Telson regularly linguiform, 

 scarcely twice as long as it is broad, and quite unarmed, tip obtusely rounded. 

 Colour, according to the the statement of Mr. Schneider, uniformly pale 

 carneous or yellowish. Length of adult female nearly (> mm. 



Eemarks. This species established by Mr. Schneider, is a very 

 distinct one, and may easily be distinguished from any of the other known 

 forms by several well-marked characteristics. Its nearest ally would seem 

 to be M. Alder i, from which it however is readily known by the equal-sized 

 antennse, and by the rather different structure of the posterior gnathopoda. 



Occurrence. - I have myself only met with a solitary specimen of 

 this form, which was collected in the Hardangerfjord, at Sunde. Mr. Schnei- 

 der has, however, found it rather abundantly in the Malangen Fjord near 

 Tromse, on hard stony bottom overgrown with algse. Out of Norway it 

 has not yet been recorded. 



23. Metopa invalida, n. sp. 



(PI. 94, fig. 2). 

 Syn : Metopa Alderi, Boeck (part). 



Body comparatively stout and compact, with rather firm integuments. 

 Cephalon about twice as long as the 1st segment of mesosome, lateral corners 

 but little projecting, and^blunt at the tip. Coxal plates rather large; 2nd 



