140 
hindmost, broadest and thinnest of the two transverse lists which are found on the ventral 
side between the head and the trunk, is provided with short hairs throughout its whole 
length. The lateral margin of the head supplied with hairs of medium length, which anteriorly 
are arranged only in a single line, but somewhat in front of the base of the maxillz begins 
a broader area, which runs obliquely backward and outward. The trunk naked; trunk- 
legs not found, but no doubt present. The genital area (fig. 3b) not quite as broad as the 
head, somewhat broader than long; the more solid chitine forms about two thirds of a ring, 
which opens broadly in front; laterally the ring is narrow, but posteriorly it is broad, its 
median part forming an area which consists of an expansion of the hindmost part of the 
ring and of a triangular process advancing anteriorly between the genital apertures and 
dilating into a smal] plate in front of the anterior extremity of the apertures; the whole 
median part of this area again is occupied by an oblong, anteriorly pointed area of thin 
skin. The genital apertures come pretty close together in front and are situated quite near 
the advancing process just described; they are rather oblique and a little curved. The 
caudal stylets are situated on the hindmost -part of the just mentioned membranous little 
central area; each of them ends in two or three setee. one of which is quite exceptionally 
long. The margin and the foremost part of the chitinous plate situated between the genital 
apertures, are provided with fine hairs, some of which are rather long; some hairs are also 
scattered outside the genital apertures on the thin membrane covering their muscles. 
MALE. Unknown. 
OVISACS. The two ovisacs found are irregularly shaped, probably owing to 
pressure; they are somewhat oblong and flattened; the largest is -42 mm. in length. The 
eges middle-sized, not numerous. 
LARVA and POST-LARVAL DEVELOPMENT. Unknown. 
HABITAT. In the marsupium of a specimen of Amphilochoides pusillus G. O. Sars 
from Denmark were found: one female and two ovisacs adhering to each other. 
REMARKS. The female of this small species is no doubt well characterised by 
the hairs on its head, the structure of the genital area and the particularly long seta of 
the caudal stylets. The name of S. Amphilochi is perhaps not quite suitable, but is was 
given, and the plate engraved, before a renewed examination of the host by means of the 
new work by G.O. Sars, revealed that it belonged to a species of the recently established 
genus Amphilochoides G.O.S. not hitherto observed in Denmark. 
23. Spheronella Dulichie n. sp. 
(Pl. VII, fig. 4a—4qd). 
FEMALE. The only specimen found (fig. 4a) is -72 mm. in length, ‘59 mm. in 
breadth and a little thinner than broad, The head of very good size in proportion to the 
