55 
entirely agrees with that in the adult animals, proves in a. satisfactory way that my 
suggestion with regard to the sexes is correct. One of the illustrated male pupe (fig. 3 k) 
is fastened by a frontal thread, which is about one third the length of the body and conside- 
rably dilated towards the end, but its extreme expanded part is of a different quality and 
forms a disk-like plate. In the other male pupa (fig. 31) the thread is shorter and some- 
what thicker, but its distal end is broken off. The fixation of the female pupa is effected 
by a thread, which is so short that the front part of the animal is pressed against the gill, 
or the plate of the marsupium, to which it is attached. — It is stated above that the pupz 
have a well-developed mouth, and it would seem probable that at least the female pupe 
take food and grow a little. Undoubtedly the males and females come out directly of their 
respective pup, like the females of the species belonging to the group of Spher. Leuckarti, 
in which [I have observed the fact myself. Only one point seems to present some difficulty, 
namely, that my male pupe are only °125 mm. in length, whereas the male animals are 
between “17 and 21 mm. lone and of a similar shape. With regard to this point I refer 
to my observation of the growth of the male of Spher. paradoxa mentioned below on p. 57—d8. 
Homoeoscelis minuta. A single pupa (pl. I, fig. 3b) was found hinged by a frontal 
thread to the gill-bearing epipod. The pupa is ‘18 mm. long, of an elongate oval shape and 
naked all over. We see the pouch-shaped processes in which the antennulz (a), the antennz (c), 
the maxille (f), the maxillipeds (g), the first pair of trunk-legs (m), the second pair (n) and 
the caudal stylets (p) are developed; but besides all these, we notice between the second 
pair of trunk-legs and the caudal stylets a pair of very small, most peculiar processes (x), 
which are possibly a rudimentary third pair of legs that do not develop any further, and 
which disappear again. The mouth with the mandibles is like the pupa of Spher. Argisse 
(s. below); the frontal thread is scarcely a fourth of the length of the animal, it is simple, 
with a discoid expansion at the end. This pupa was hinged in the branchial cavity between 
two adult males attached in the same way, but there was no female, and these two circum- 
stances make it more than probable that the pupa was a female, especially, as in a large 
materia! of this species I have seldom found more than one male, and never more than two 
males and one female in the same branchial cavity. Later on I found in two specimens 
respectively two and three pups, one among the latter of which — being no doubt younger 
than the others — was somewhat smaller and had less developed rudiments of limbs, though 
otherwise it was similar to the other four, all of which agreed with the above-described 
specimen. (The frontal thread in one of the specimens was half as long as the body). 
Considering that (as stated above) I have never found more than one female and two males 
in the same branchial cavity, the four large pupae must either all be males, or — which is 
probable — be male and female pup. So, judging from the sex of the minutely described pupa, 
there is no difference between the development of the two sexes, and this agrees very well with the 
fact that recently hatched females can sometimes be distinguished from the males only by 
possessing genital apertures, as in several males the spermatothecse are not distinctly seen. 
