CRUSTACEA COPEPODA. I. 69 
87. Spheronella Bonnieri H. J. H. 
1897. Spheronella Bonnieri H. J. Hansen, Choniostomatide p.136, Pl. VI, figs.4a—4d; Pl. VII, figs. 
I a—t b. 
Occurrence. — It lives on females and generally in the marsupium of Protomedeia fasciata Kr. 
at West Greenland. Some few hosts determined by Kroyer were without special localities; others were gathered 
in the harbour of Godthaab (Lat. 64°11’ N.) in 2—3 fathoms by Th. Holm, and one among them was a female 
without marsupium bearing a small female and a male (Further particulars l.c. p. 137—38). 
88. Sphzronella 4 gine n. sp. 
(Pl. V, figs. 3 a—3 g). 
Female. — The largest specimen is 2.1 mm. long and 1.95 mm. broad (fig. 3 a), The head is some- 
what small and well defined from the trunk. The frontal margin is naked. — Antennulze of middle length 
(fig. 3d), rather robust, 3-jointed; first joint conspicuously shorter and thicker than the second, while the 
third is slightly shorter than the two others combined, and its distal setee are moderately long. — Antennz 
rather small, 3-jointed; second joint much longer than the first and slightly longer than the third, which 
is about as long as the terminal seta. — The mouth somewhat large; its border of medium breadth. — On 
the maxillulz an additional branch could not be discovered. — The maxille normal; the basal joint smooth. 
— The maxillipeds scarcely of medium length; the first joint somewhat robust, naked; second and third 
joints completely fused and rather short, with a thick spine below the base of the claw, and the claw has 
3 fine spines on the distal part of its concave margin. 
The submedian skeleton does not show any peculiarity; at the base of each maxilliped several hairs 
directed inwards. The protruding lateral borders of the head naked. — The genital area (fig. 3 e) much 
narrower than the head (figs. 3 d and 3 e drawn with the same enlargement), forming a kind of transverse 
rectangle much broader than long, with the angles broadly rounded, the posterior margin rather concave and 
nearly incised at the middle, while the anterior has the median part concave and the lateral parts irregularly 
defined; pubescence completely wanting. The figure exhibits also a spermatophore on a long stalk, and the 
stalk of another. The caudal rami rather close together very near the posterior margin of the chitinized 
genital plate as two rounded knots; setee absent and probably lost. 
Male. — The specimen exhibited in figs. 1 f and 1 g is 0.42 mm. long and scarcely 0.32 mm. broad; 
seen from the side it is moderately thick. The head is conspicuously shorter than the trunk, and the animal 
is broadest just behind the head. The frontal border somewhat produced, rounded and naked. — The anten- 
nulze only of moderate length and distinctly more slender than in female; first joint conspicuously longer 
and thicker than the second and scarcely as long as the third; sete as in the female. — Antennz small, 
3-jointed. — Mouth somewhat small. — Maxillule with a distinct additional branch. — Maxille rather 
small; basal joint without tooth or sete. — Maxillipeds somewhat small; first joint rather slender, with 
a few sete on the anterior margin; second joint very slender; the third somewhat widened towards the end; 
the claw with about 3 fine spines on the concave margin towards the end. — The submedian skeleton with 
the second pair of processes somewhat long, cylindrical and diverging; the two other pairs wanting. — From 
