152 



tolerably small branches of equal length, each of which consists of a somewhat thicker, 

 very short joint, from the end of which proceeds a thick, but rather short, partly hairy seta. 

 The second pair of legs are situated at the posterior angles of the trunk and greatly resem- 

 ble the first pair, but the basal part is even more indistinct, the joint of the inner branch 

 much shorter than that of the outer branch, and the terminal setae — paiticularly that of 

 the outer branch — longer than in the first pair. Caudal stylets altogether wanting. 



OVISACS. They are pretty small or of medium size, circular or oval and mostly 

 somewhat flattened; the ovisac lepresented in fig. 3c is one of the larger ones and is 94 mm. 

 in length. Eggs numerous and comparatively small. 



LARVA. Pig. 3i — 3o are drawn from specimens which had just broken out of the 

 egg-membrane. The larva is '30 mm. long and so slender that its cephalothorax is a little 

 more than twice as long as broad. The front is richly decorated (fig. 31): its margin with 

 a series of rather short and very shoit pi-ocesses wliich begin at some distance from the 

 base of the antennula and stop a short distance from the median line; the eight or ten pro- 

 cesses nearest to this line are really situated somewhat within the maigin and are much 

 longer than the more lateral processes which proceed from the edge; somewhat inside the 

 more lateral part of the frontal margin appears ou each side a long, obli(iue row of tolerably 

 long, nariow processes, turning foiward and outward in an oblique line; somewhat behind 

 them we see a cui'ved transverse list, and at the inner angle of tliis list — consequently in 

 front of the mouth at a short distance from the median line — four or five rather long, and 

 especially comparatively thick, anteriorly somewhat diverging processes with rounded apex. 

 Antennul* 2-jointed, their olfactory seta somewhat more than half the length of the cephalo- 

 thorax. Antennae equal in length to the antennulae; first joint broad, sometimes ^\■itll a strong 

 indication of being formed of two coalescent joints (fig. 3 m), the first of which is short 

 (comp. the following species); second joint of the same length as oi' a little longer than the 

 first; third joint short, with two terminal setae, one of them short, the other nearly the 

 length of the two last joints combined. The maxillulae have all four branches well developed, 

 the outermost being the longest, curved outward and backward, hairy. The basal joint of the 

 maxillae has two rows of processes (fig. 3o), but one of them is often covered by the second 

 joint (fig. 3n), wliich has no seta^; the tliird joint has two good-sized processes on its inner 

 margin, but the distal one, which is the largest, is smaller than the long, curved, terminal 

 part of the joint. Abdomen pretty long ; a description of it is found above on p. 141). Setae 

 of the caudal stylets more than tlu-ee fifths the length of the body. 



POST-LARVAL DEVELOPMENT. Unknown. 



HABITAT- Found in the marsupium of six specimens of Diastylis Rathkei (Kr.) 

 from West-Greenland and in one specimen from the Kara Sea, but not in Denmark. It 

 may be pointed out that I have found parasites in nearly half of the adult females from the 

 two localities mentioned, which I have seen, whereas an investigation of several scores of 

 females fi'om various Danish waters gave a negative result. In one specimen occurred: one 



