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 maxillae 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. 3 b) not quite as broad as the 

 head, somewhat broader than long; the more solid ehitine 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 small 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 setae, 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 

 eggs middle-sized, not numerous. 



LARVA and POST-LARVAL DEVELOPMENT. Unknown. 



HABITAT. In the marsupium of a specimen of AmpMlochoides pusillus G. 0. 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. 0. Sars, revealed that it belonged to a species of the recently established 

 genus AmpMlochoides G. 0. S. not hitherto observed in Denmark. 



23. Sphaeronella Dulichiae n. sp. 



(PL VII, fig. 4 a— 4 d). 



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 



