57 



Superior antennae, with tlie 1st and 2nd joints of the peduncle produced 

 anteriorly to blunt tooth-like projections; flagellmn in female only little, in 

 male nearly 4 times longer than the peduncle, 1st joint in female as long 

 as the remainder 10 joints combined; accessory appendage scarcely longer 

 than the latter, 3-articulate. Inferior antennae in female more than twice the 

 length of the superior, in male about as long as the body, last joint of the 

 peduncle nearly twice the length of the penultimate one. Anterior gnatlio- 

 poda with the basal joint as long as the meral and carpal joints combined, 

 propodos half the length of the former, palmar edge finely denticulated. 

 Dactylus of the pereropoda scarcely more than half the length of the propodos. 

 Last pair of uropoda with the rami about twice the length of the basal part, 

 terminal joint of the outer ramus very small. Telson nearly twice as long 

 as broad, cleft beyond the middle, the incision very narrow in its anterior 

 part; terminal lobes obtusely acuminate, each with a small apical denticle 

 and another dorsal near their base. Body whitish, pellucid, with a few 

 orange-coloured pigmentary bands dorsally across the segments of the nieta- 

 some. Length of female reaching 14 mm., of male 11 mm. 



Remarks. This form has been erroneously identified by Boeck and 

 most subsequent authors with Kroyer's Anonyx HolboUi, which latter according 

 to the recent statements of Dr. Hansen is a very distinct species not occur- 

 ring out of the arctic seas. The present species is easily distinguished both 

 from the said arctic form and from the succeeding new species by the strong 

 dentiform projections formed by the 2 first peduncular joints of the superior 

 antennae and especially by the peculiar form of the posterior projection of 

 the last epimeral plates of the metasome. 



Occurrence. I have met with this form only on the south and west 

 coasts of Norway. It occurs in comparatively shallow water, from 6 to 20 

 fathoms, especially on sandy bottom, and buries itself with great dexterity 

 within the loose bottom-deposit. Occasionally it also descends to considerable 

 depths, 60100 fathoms. 



Distribution. - - Bohuslan, Denmark, British Isles, France, Mediterranean 



(taken by the author at Naples). 



1(3. Hippomedon propinqvus, U. <>. Sars, n. sp. 



(PL 21, fig. 1). 



Very like the preceding species, but of somewhat smaller size. Lateral 

 corners of cephalon narrowly rounded at the tip. First pair of coxa! plates 

 not nearly so strongly dilated as in N. denticulatus, and scarcely broader 



