W. Lilljeborg on the Genera Liiiope and Peltogaster. 49 



also in the middle. Beneath this chitinous lamella is a thick 

 layer of an intercellular substance and indistinct cells, among 

 which are more or less evident muscular fibres, feebly joined to- 

 gether, and destitute of transverse strise. This membrane is 

 easily detached from the others ; it is described by Leuckart 

 (/. c. p. 427) as " a sort of fatty body, or a cutaneous muscular 

 sac permeated by fat." Within this muscular membrane there 

 is another, delicate and transparent, containing small irregular 

 cells. At the upper part of the tube leading to the opening of 

 the mouth the two inner membranes unite with each other and 

 with the membranes enveloping the internal body, forming the 

 tube which clothes the inner face of the neck of the adhesive 

 organ. At the orifice opposite the mouth and on one side of 

 the body, these two membranes are also joined to those of the 

 fleshy body. The tube descending to the organ of adhesion is 

 not spiral (fig. 2 a). 



The internal body {corpus carnosum) differs little in the living 

 animal from that already figured by the author. It is more 

 inflated and rounded. A longitudinal section through the organ 

 of adhesion and the opposite opening is elliptical. The body is 

 surrounded by a delicate and transparent chitinous membrane, 

 on which there are small raised and irregular cells, probably the 

 nuclei of cells remaining after the membrane became chitinous. 

 This membrane exactly resembles the third or innermost mem- 

 brane of the pallium. It is united to that membrane at the 

 lower part of the body, at the orifice of the pallium and on the 

 right side of the body, and may be regarded as a continuation 

 of it. Between these two membranes are the oviferous tubes, 

 slightly attached to both of them, and not surrounded by any 

 other membranous sac, so that the young, when hatched, may 

 escape directly through the orifice of the pallium. In a specimen 

 with empty oviferous tubes, the residue of their membranes was 

 at the right side of the orifice of the pallium, and some of their 

 branches extended into that orifice. In the same specimen, near 

 this spot, and in the vicinity of the ramose gland, there were in 

 the bq^y some brownish corneous tubercles, of irregular and 

 variable form : these were probably products of the ramose gland. 

 Close to the right side of the orifice of the pallium (fig. 2 c) is 

 the orifice through which the internal ovaries communicate with 

 the oviferous tubes. The lower part of the body, in the vicinity 

 of the tube descending to the organ of adhesion, is whitish, and 

 the internal ovaries do not penetrate to it. The muscular mem- 

 brane forming its wall is more compact than elsewhere, except 

 the part surrounding the pallial orifice. In two small fragments 

 of this membrane, the author observed some filaments swelled 



Ann. S^ Mag. N. Hist. Ser.3. Vol.\'u. 4 



