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qualified to form a character of species. Trunk naked; trunk-legs present. Genital area 
(fig. 4d) essentially as in the preceding species, for in S. Giardii the chitinised semi-circle 
can be almost as broad as in S. Bonnieri; the only deviation found is the situation of the 
caudal stylets which in the latter are placed a little more towards the front on the ring 
itself, but whether this is a valid character, | am not prepared to decide. 
MALE. Considerably larger than in S. Giardii, two specimens being respectively 
28 mm. and 29mm. in length, but they differ chiefly from that species in the swollen 
appearance of the trunk, — its volume several times exceeding that of the head — and in 
a very different hair-covering (fig. 1a and fig. 1b). Its frontal margin, antennule, antennee, 
mouth, maxillulze, maxille and maxillipeds do not exhibit really good characters. The first 
pair of processes of the sub-median skeleton seem to be longer, whereas the second pair are 
a little shorter than and differ in shape from S. Giardii. The hair-covering of the lateral 
border of the head as in this species, but the border itself is shorter and vanishes outside or 
a little behind the base of the maxilla, and from this point the boundary line between the 
naked head and the hair-covered trunk runs upward and backward in a slightly oblique 
direction across the side and the back. The whole dorsal surface, the sides and the ventral 
surface, except its foremost pretty considerable part, are closely covered all over with simple, 
moderately long hairs which grow separately (not as in S. Giardii two or three from the 
same little eminence); the back without naked transverse area. On account of the swelling 
of the trunk, the legs and the caudal stylets are much further removed from the lateral 
and the posterior outline than in nearly all other species, and the caudal stylets are situated almost 
in the middle of the ventral surface. Both pairs of trunk-legs are proportionally smaller, 
and their long terminal setz a little shorter than in S. Giardii; from the peduncle of the 
first pair of legs outside the outer branch proceeds a distinct process ending in a seta, but 
the other differences in the length of the seta etc. between this and the preceding species 
are of slight or no value. 
(Three, but not the fourth, of the males found are more or less closely wrapped up 
in long, fine threads, or rather, it looks as if a thread were wound round the body in 
numerous curves and with projecting nooses, but I have tried in vain to find out the origin 
and nature of these remarkable threads. Fig. 4b exhibits one of the closely wrapped 
specimens.) 
OVISACS. These are oval or shortly oval (fig. 4c), a little larger than and with 
somewhat larger eggs than in S. Giardii, otherwise as in this species. The ovisac repre- 
sented (fig.4c¢) is 53mm. long and 43 mm. broad. 
LARVA and POST-LARVAL DEVELOPMENT. Unknown. 
HABITAT. Protomedeia fasciata Kr. from West-Greenland. I have found it in 
old specimens which were determined by Kroyer, but unfortunately I neglected at the time 
to put down statistics about the number of hosts ete. of the parasites found, viz.: one adult 
female, one half-grown female, one very small female, one male without surrounding threads 
18 
