66 Alf Wollebæk. [No. 12 
altogether wanting, or present either in å defective condition with 
broken setae, or else as å quite small shrunken appendix, as shown 
in fig. 5,3. 'To make sure that these latter also were really males 
I dissected several specimens. In every instance I found, on dis- 
secting them, distinet if small testes and vas deferens. 
On sorting å considerable number of specimens 
caught in the first autumn months, according to 
the nature of their organs of copulation, the bulk 
of the males found with straight strong copulatory 
organs and well developed appendices masculinae 
(see fig. 5, I, 1), consisted of individuals about 
larger. The males with shrunken organs of copu- 
lation (as depicted in fig. 5, IIT, 3) were all rather 
large specimens, — about 50—60 mm. 
In very small male specimens (about 25 mm.) 
the inner branch of the 1st pleopod (fig. 6, ri. I 
Pl. pd.) was found resembling the corresponding 
member of the females, but it was furnished at the 
tip with an organ of ceopulation [in the same man- 
ner as mentioned for Pandalus borealis]. Appendix 
maseulina (fig. 6, a.m.) on the inner branch of the 
2nd pair of pleopods was quite short and but little 
developed without any stiff setose covering. Not 
only in the shape of the inner branch of the lst 
pair of pleopods and in the feeble appearance of 
the organ of copulation but also in the diminutive 
size of appendix masculind, there is considerable 
Fig(6. 
still immature and several of the larger males with 
corresponding organs of the shape depicted in fig. 5, IIL, 8. How- 
ever in the case of these last the said appendices were always of 
åa more shrunken appearance. 
In bis work, *On the British Pandalidae” (The Annals and 
Magazine of Natural History. Vol III, 7 series. London 1899) 
Dr. W. T. Canman states that in 3 specimens he has found on 
the endopodite of the 1st Pleopod, *the inner process club-shaped, 
narrow at the base and swollen at the tip, and it projects some- 
1) Measured from the margin of the telson to the tip of the rostrum. 
35—-40 mm. iong,) and some that were rather 
resemblance between the young individual smanifestly 
