312 Proceedings of the Royal Society of Edinburgh. [Sess. 
that the right and left ovaries are equally developed, that a testis is not 
present, and that the specimen was not parasitised. 
Examination of the external and internal features shows that this 
specimen is a female, which departs from the normal only in the possession 
of a left antennule similar (except in the length of its flagellum) to that of 
a male. 
II. The second specimen was, unfortunately, dead when it came into my 
Fig. 5. — Outline of the right valve of the cara- 
pace of specimen II. Note the anterior 
projection bearing hairs. The contour 
of the dorsal region of the carapace, in- 
dicated by the dotted line, was not well 
preserved, x 60. 
hands, but, although its soft parts were not in good condition, its appen- 
dages were perfect. This example is less than the preceding, its length 
being only T6 mm., and the maximum depth of its carapace about *9 mm. 
The carapace presents the general contour of that of a female ; it is arched 
dorsally, though not so markedly as in the previous example, and a brood- 
pouch is present, but it is not large and does not contain any young. The 
ventral margin of the carapace forms a fairly even convex curve (fig. 5), 
as in females. (The male carapace (fig. 6) has a more rhomboidal form.) 
Fig. 6. — Outline of the right valve of the 
carapace of a male, for comparison 
with fig. 5. x 60. 
