44 NOTICES OF SERIALS. 



stout as the other thoracic feet, and somewhat flattened ; the fifth joint tapers 

 gradually to the end, so that it is nearly lanceolate ; the hind margin of the leg 

 thickly clothed with hairs — some simple, others plumose — which are longer than 

 the joints they spring from. The third and fourth pairs resemble each other; 

 having their third joint much enlarged from the slender base to the end; the 

 fourth joint diminishing towards the end, and there rounded, only half as long 

 as the preceding ; the fifth joint slender and curved like a claw, bearing a short, 

 obtuse, and nearly obsolete claw. The fifth pair has the first joint broad and 

 dilated into the form of an obliquely obovate shield, minutely scalloped along the 

 hind margin, with bristles springing from the indentations; the third joint 

 also enlarged into a shield, with either margin curvilinear, except towards the 

 external angle, where they converge to a rectilinear acute angle, the hinder edge 

 beset with a number of stiff and straight plumose bristles, which stand erect, and 

 reach outwardly to the end of the fifth joint ; the fourth and fifth joints oblong, 

 obliquely truncated at the end; the fifth beset with long stiff bristles around the 

 margin and without any trace of a claw. The sixth and seventh pairs are 

 nearly alike ; the sixth longest of all, with a nearly orbicular femoral joint, 

 thickly beset with bristles all round, as is also the hind margin of the 

 following joints, so that a claw can scarcely be distinguished among the 

 spiny bristles at the end of the fifth joint; the femur of the seventh pair is 

 Ktore elongated. The three pairs of Natatory feet are of ordinary shape, with 

 a short basal joint, and a pointed paddle composed of about 10 to 12 joints ; the 

 first two pairs equal, and one- third less than the seventh thoracic pair ; the third 

 pair less than those two, as respects the length both of the basal joint and the paddle. 

 The fourth pair of abdominal legs as long as the third, with the undermost of the 

 two terminal joints shorter, partly from its insertion being higher upon the basal 

 joints ; — the fifth pair one-half less than the third, the terminal joints short, 

 crowned at the tip with short spines : the sixth pair of peculiar form, occasioned by 

 the very unequal development of the two parallel terminal branches ; the basal joint 

 short ; the inner branch rudimentary, in the form of a minute pointed foliaceous 

 scale, implanted at the base of the outer branch, which is composed of two joints ; 

 the first longest, elongate-lanceolate, slightly scalloped inside towards the tip and 

 clothed with long plumose bristles ; the second joint about one-fourth the size of the 

 first, slender and subulate, with terminal bristles. Caudal appendaye composed of 

 two equal lobes ; rounded at the end and surrounded with bristles. Epimera small 

 and rectangular. Segments of the body smooth and the form generally rounded. 

 Length under 3 lines. 



[Extracted from the Proceedings of the Eoyal Swedish Academy for the year 

 1855. See Notices of Serials, page 9, in this volume.] 



A few specimens were found near Wisby, on a sandy bottom, at the 

 depth of 18 to 24 fathoms : a specimen also at Landskrona. 



The only other form with which this new genus has any points of near 

 agreement is Anonyx Kr. The relative proportion between the peduncle 

 and the flagellum of the upper antennae indicates rather an analogy than 

 an actual affinity. The form of the first pair of feet has a remarkable re- 

 semblance to that in Anonyx. In other respects, the genus is separated by 

 the want of claws to the second and fifth pairs of thoracic feet, the peculiar 

 structure of the maxillary feet, and the degree of development of the 

 seventh pair of abdominal members. 



Erratum. Page 1 1, lines 42 and 45, for Carynthian read Carniolan. 



