W. Lilljeborg on the Genera Peltogaster and Liriope. 163 
sion to refer to it. Professor Lilljeborg considers that Rathke’s 
Peltogastri belong to the group of Cirripedes, and admits the 
generic divisions established in them by Diesing. 
Genus Pacuyspe.ia, Diesing, Syst. Helm. i. p. 435. 
Of this genus, which, as Leuckart has shown, is identical 
with Sacculina of Thompson, the author gives the following 
character :— : 
Animal e Crustaceorum classe et Cirripediorum subclasse, ectopara- 
situm sub abdomine Crustaceorum Decapodorum Brachyurorum 
degens. 
hel adultum crassum, sacciforme, transverse ellipticum, cute 
(pallio) levi, molli, sed firma, corpus crassum, carnosum, intus 
glanduliforme et sine cavitate digestionis distincta, instar pallii 
circumdante, vestitum. Os in organo adfigendi, vel acetabulo, 
subinfundibuliformi, corneo perforatum, et in cesophagum trans- 
iens. Anus nullus? Ovaria externa numerosa, ramosa, czci- 
formia, circa corpus adfixa et membrana tenui involuta. Ovaria 
interna in corpore carnoso sita. Cavitas inter ovaria externa et 
pallium per foramen sat magnum, ori oppositum et plicis cutis 
circumdatum, aperta. Organa masculina ignota. 
Pullus entomostraciformis, pullo Cirripediorum processibus ad latera 
partis anterioris corporis similis. 
The form of the young proves that these animals belong to 
the Cirripedes. The mature animal is a sac without segments, 
eyes, or limbs (Pl. IV. fig. 6). This sac presents two prominent 
parts, of which the first, situated on the side by which the 
creature is attached to the animal on which it lives as a parasite, 
is a funnel-shaped organ of attachment (fig. 6 a), supported by 
a short neck and perforated in the middle by the mouth. At 
the opposite side there is a short tube, formed by folds of the © 
skin, and surrounding an aperture of considerable size; the 
latter leads into the cavity containing the external ovaries, and 
appears to be intended to give exit to the young. 
The cesophagus is small and short ; in the individual examined 
by the author it was curved in a spiral form, and fixed to the 
lower side of a large fleshy part. The latter had a glandular 
appearance internally, and had no distinct digestive cavity ; the 
author regards it as the transformed body probably occupied 
for the most part by the generative organs. The voluminous 
racemose interior ovaries were seen distinctly, but no male 
organs were observed. This body was continued to the superior 
aperture, where, however, it presented no anal opening, but its 
thick outer coat forms the large folds which surround that ori- 
fice. Atone side the membrane enveloping the body appears 
to be more compact, and furnished with several distinct folds, 
