50 W. Lilljeborg on the Genera Liriope and Peltogaster. 



here and there, and without transverse striae. At the place where 

 they were torn they presented a fibrous structure. The author 

 has found similar filaments in Peltogaster, and seems to think 

 that they may be nervous. Otherwise he has found no trace of 

 a nervous system. 



In the inferior part of the body there are two organs in the 

 form of elongated sacs placed close together (PI. II. fig. 9). At 

 the closed end (a) the walls are thick, compact, and whitish ; at 

 the other end (b) they are thin and cellular. The contents of 

 these are small globules of variable size, without nuclei. One of 

 these organs was observed by Thompson, who says that it is 

 transparent, and supposed that it might be a stomach. They 

 appear to correspond exactly with those described by the author 

 in his former memoir, and which he regarded as primitive ova- 

 ries in P. Paguri and as male organs in P. sulcatus. From ob- 

 servations on the contents of the corresponding organs in a form 

 allied to Peltogaster, he is led to believe that they are testes. In 

 P. sulcatus he has always found them largest in the smaller 

 specimens, which had the ovaries and ova least developed. 

 Amongst the cells with a distinct nucleus he has also seen glo- 

 bules of larger or smaller size, some of which were of a brownish 

 colour. 



No digestive organs were detected by the author ; but he 

 thinks that if the animal has a stomach, it will be situated in the 

 lower part of the body. 



The remaining and greater part of the internal body is of a 

 complicated structure, and consists principally of muscular tissue 

 and of the ovaries, together with a pretty large gland, regarded 

 by Leuckart as a cement-gland. The muscular membrane form- 

 ing the walls of the body resembles the second membrane of the 

 pallium ; but the muscular fibres are transversely striated. It is 

 covered externally by a very delicate membrane, probably of 

 chitinous nature, presenting bands similar to those of the second 

 membrane of the pallium. The internal muscular tissue is most 

 dense about the orifice of the pallium, round which it forms a 

 sort of sphincter (fig. 2 b). The interior of the body is divided 

 into several compartments containing the ramified ovaries. 



The muscular membrane of the body close to the orifice of the 

 pallium resembles that covering the lower part of the body. It 

 rises a little above the muscular membrane of the vicinity, and 

 extends to the orifice of the pallium. Beneath this membrane 

 there is a large gland formed of ramified tubes (fig. 4). Its 

 efferent canal was not observed, but its component tubes are 

 directed towards the upper part, and therefore probably towards 

 the orifice by which the internal ovaries communicate with the 

 oviferous tubes. The component tubes are 0-04 millim. in dia- 



