136 Dr. R. Bergh on Phidiana lynceus. 
possess urticating cells. Besides it is easy to show that in 
several Alolididee (for instance, species of Glaucus, which live 
almost exclusively on one kind of food, Vellella and Porpita) 
the urticating threads found in the digestive tube and derived 
from the food are quite different from those found in the urti- 
cating cells and secreted by the animals themselves. Nor does 
that theory agree with the fact that the urticating cells are toa 
great extent not free in the sacs, but enclosed in cysts, and 
become free only by the bursting of the latter. Dr. Bergh refers 
finally to the great analogy in anatomical respects between 
Holididee and Pleurophyllidide, and concludes that the urti- 
cating cells in the sacs are the product of the AZolididee them- 
selves, and not derived from their food. 
On the back of one of the specimens of Phidiana lynceus, 
immediately behind the second group of papille, a deep de- 
pression was observed, as if some body had been located there 
but had fallen off; in the middle of this depression an irregular 
round opening of 0°25 millim. diameter was seen. The sexual 
gland was very much atrophied, only the foremost and hind- 
most lobes being well developed. In the second specimen a 
round opening, 0°75 millim. broad, was observed in exactly 
the same place as in the first specimen, and a pointed promi- 
nence was seen in the opening ; another, much smaller opening 
was seen in front of the one described. On the sides of the 
animal several yellowish slanting bodies seemed to shine 
through the integuments from inside. When the inner cavity 
was examined the greater part of the space usually filled by 
the sexual gland was occupied by a parasite, the gland being 
atrophied as in the first individual. The parasite was a Co- 
pepodous crustacean, with the back downwards, the head 
forwards, and the posterior extremity reaching out into the 
larger opening before described. This crustacean reminded 
one of the Splanchnotrophus brevipes of Hancock and Norman, 
but differs from this in several important points, viz. the 
well-developed large cephalothorax, the articulated abdomen, 
the absence of true limbs, the peculiar arm-like lateral 
prolongations of the body, the dorsal prolongation, and the 
remarkable prolongation of the abdomen (which forms a kind 
of tail). 
The only specimen was a female: no males could be dis- 
covered ; and Dr. Bergh recalls with good reason Professor 
Kroyer’s remark, in his last contribution to the history of pa- 
rasitic Entomostraca (Naturhistorisk Tidsskrift, ser. 3. ii. 
1863, p. 396), that ‘ whenever the incompleteness of our know- 
ledge compels us to found genera on females only, or to group 
species of which only the female is known together with others 
