58 W. Lilljeborg on the Genera Liriope and Peltogaster. 



the outer layer are larger, more transparent, and less strongly- 

 united than those of the inner, and at its outer margin there 

 are one or two rows of cylindrical cells of larger size than the 

 rest. The inner layer is of a yellowish or brownish colour ; its 

 cellular structure is less distinct, and is not perceptible at its 

 outer margin, which is somewhat fibrous and distinctly limited. 

 This margin has already some resemblance to the organ of ad- 

 hesion in Sacculina. The inner layer is also compact and co- 

 herent even under strong pressure ; so that everything seems to 

 prove that it is this layer which, in the fully-developed animal, 

 becomes converted into the horny disk attached to the skin of 

 the Pagurus. At the point where the inner tube is fixed, there 

 is a hole through the two chitinous lamellae of which the skin of 

 the Pagurus consists; and after the removal of the young Pelto- 

 gaster, a portion of the internal tissues of the Pagurus may be 

 seen hanging out of this aperture. Hence it is clear that it is by 

 the inner tube that the Peltogaster sucks its nourishment from 

 the abdomen of the Pagurus. 



The testes are very large, and placed at the upper part of the 

 tube just described. This great development of the testes in so 

 young an animal leads one to suppose that they may at this 

 time have some other function than that of testes. As they 

 contain brown pigment-granules and their contents are very 

 coherent, the author is inclined to think that they secrete the 

 cement, as do the ovaries, according to Darwin, in the ordinary 

 Cirripedes. The pallium in this Peltogaster bristled with short 

 spines. 



In a specimen nearly twice the length of that figured (fig. 4) 

 the body was rather more elongated, and the ovarian sac with 

 its contents was more evident. The tube of the organ of ad- 

 hesion was smaller, and had become narrower at its lov/er extre- 

 mity. The testes were also smaller. It exhibited no vermicular 

 contractions, but curved its body in various directions with viva- 

 city. There was an orifice at the anterior extremity of the body. 

 The author describes the mode of attachment of this Peltogaster 

 to the abdomen of the Pagurus. When viewed fi'om the lower 

 surface of the skin of the latter, there is an orifice surrounded 

 by the inner chitinous lamella of the skin, which is still very 

 delicate and transparent, having been very little impregnated 

 with cement, but immediately round the orifice presents some 

 concentric striae. Beyond and round this lamella there is a 

 circular border, thick and brownish, belonging to the outer 

 lamella of the skin of the Pagurus, This border marks the limit 

 of the aperture in the outer lamella; it is already strongly 

 impregnated with cement, and from it there run inwards some 

 radiatiuK lines formed of brown cement. 



