58 Alf Wollebæk. [No. 12 
sketeh Pl. XI). The central part is considerably longer than the 
first part of the vas deferens. It forms a slight bow with å small 
bend in the middle, as will be seen in the drawing. 'The coils and 
bent shape of the central portion have been found constant in all 
the individuals examined, but the size of the coils (and of the 
testes) differs very much according to the season at which the 
specimens have been taken. The top and bottom left figures depieted 
on PI. XI are from specimens taken in the summer. 'Testes were 
then found long, the coil of vas deferens on the other hand 
comparatively small. In specimens taken in the middle of October 
the coil of vas deferens (see the central figures on Pl. XD is 
noticeably much larger and thicker: the testes are short, and the 
coil on the right and left side reaches forward beyond the anterior 
extremity of the testes. The shape of the coil is however in the 
main the same. OQwing to the coil reaching very far forward the 
little thin anterior part of vas deferens which connects the coil 
with the testes, has after issuing from the testes, an anterior 
direction; though otherwise when the coil is small it goes straight 
downwards, or else downwards in å posteriorly slanting direction. 
The lowest part (dj) Ductus ejaculatorwus is quite short and more 
or less expanded, being more expanded in prawns taken during the 
autumn and less so in specimens captured during the summer. 
Spermatophores. These I have not found in Pandalus 
borealis or in any of the other Pandalus species whose genitalia I 
have examined. 
Spermatozoa (sp) Å large aceumulation of these were 
found near the mouth of Ductus ejaculatorius, and they resembled 
those of several other Carids. They are furnished with å little 
slightly curved and very thin spike as well as with an irregularly 
shaped rather round or else oval part. Looked at from above the 
thin spike can be distinetly seen through it, and appears like å 
little rather dark mark. 
Females. Ovaries (ov): On Pl. XI are shown depicted the 
ovaries of a specimen nearly 12 em. long which was taken in the 
Skagerack (outside Risør) during the summer. 'These had å length 
of 12 mm.; whereas the ovaries in å specimen taken during the 
autumn, whose spawn was just ready to issue, were of quite double 
the length, and with å proportional inerease in breadth and thick- 
ness. Ås can be seen from the figure the two half portions lie 
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