134 



short and rounded, the second pair short, somewhat produced and strongly converging. 

 The lateral margin of the head in its whole length supplied with hairs of medium length; 

 somewhat in front of the posterior extremity of this margin begins the line which runs 

 upward and backward in a somewhat oblique direction across the side and the back; in the 

 latter place the hairs become long, but in this species this line only forms the anterior 

 boundary of a broad belt of hairs of medium length, behind which we find the usual naked 

 transverse area, which is rather long and also broad; the remainder of the trunk: its sides, 

 posterior extremity and ventral surface, are closely covered with hairs, part of which are 

 proportionally rather long. The head has empty spaces beneath its skin. The first pair of 

 trunk-legs are rather small, with a single, pretty short branch, and a tolerably short and 

 thick process on the outer side at its base; the branch ends in two setae, one of which is 

 short, the other long, but scarcely the length of the basal joint of the maxillipeds. The 

 second pair of legs are of less than medium size, with a shorter outer branch and a some- 

 what longer inner branch; the terminal seta of the outer branch scarcely half the length of 

 the whole leg, whereas the inner branch has a short seta on its outer side, and the terminal seta 

 is nearly the length of that of the first pair of legs. The caudal stylets rather short, each 

 with a pair of terminal seta?, which are somewhat thicker and longer than the hairs of 

 the trunk. 



OVISACS. Only two are found; they are tolerably large and of about equal size; 

 the one represented (fig. 2 c) somewhat flattened and rather triangular in outline, its longest 

 diameter being 59 mm. The eggs pretty numerous, about middle-sized. 



LARVA and POST-LARVAL DEVELOPMENT. Unknown. 



HABITAT. The marsupium of Gitanopsis arctica G. O. Sars from Varangerfjord 

 (the most northern part of Norway) at Vadso. Prof. Sars discovered the parasite in a single 

 specimen, which he subsequently lent me, and in which were found: one female, one male 

 and two ovisacs. 



19. Sphaeronella Giardii n. sp. 



(PL VI, fig. 3 a— 31.) 



FEMALE. One specimen (fig. 3 c) which has laid six ovisacs and no doubt has 

 finished laying eggs, and which is oblong and somewhat shrunk, measures 63 mm. in length 

 and "45 mm . in breadth, whereas another female (fig. 3 a), which had not yet begun laying 

 eggs, is T24 mm. long and 1-31 mm. broad — consequently broader than long — and about 

 double the length and nearly three times the breadth of the first mentioned specimen. The 

 head is proportionally small and well defined from the trunk. The frontal margin is naked 

 (fig. 3 e). Antennulae of medium length, pretty robust, with short apical setae. Antennae 

 3 jointed, the second joint longer than the first or the third; the terminal seta of medium 

 length. The mouth-border of medium breadth. The maxillulae with a good-sized additional 



