60 W. Lilljeborg on the Genera Liriope and Peltogaster. 



is a large rounded aperture in the pallium ; the margin of the 

 chitinous membrane of the pallium round this orifice is a little 

 elevated, and by this the animal is fixed to the skin of the Pa- 

 gurus. At the posterior extremity of the body there is a small 

 tubercle or tube {h), the outer membrane of the pallium forming 

 there a projecting border ai'ound an aperture which is closed by 

 the internal membranes. A short and corneous tube from the 

 ovarian sac also leads to this point. At the anterior extremity {a) 

 there is a large gaping orifice, of which the lower margin forms 

 an obtuse point. If the posterior tube is ever opened, we have 

 thus an anterior and a posterior orifice, which seem to offer some 

 analogy with a mouth and an anus, even if they have not the same 

 functions. The pallium consists of the ordinary membranes. 

 In the muscular membrane, especially on the lower surface, 

 there is a system of lacunar vessels (figs. 7 & 8), presenting 

 trunks of considerable size, from which numerous branches 

 ramify throughout the pallium. 



The ovarian sac (fig. 9) o-esembles that of Peltogaster Paguri. 

 The outer membrane has longitudinal bands, and beneath it 

 there is a muscular membrane with fine fibres slightly bound 

 together. At the anterior extremity this membrane forms a 

 thick layer of lax cellular tissue (fig. \0b). The two sacciform 

 ovaries (c c) are surrounded by a very delicate structureless 

 membrane. They had apparently been recently emptied, and 

 contained very few ova, which resembled those in the ovisac. 

 At the posterior extremity {b) there is a short tube, before which 

 the two ovaries are united. Between the ovaries (which are 

 spread out in the figure) there is a single testis [a), of large size, 

 oval, opake and yellowish, attached by connective tissue near to 

 the anterior extremity. Its walls are formed of a delicate struc- 

 tureless membrane, clothed internally with a thick layer of forma- 

 tive matter. From the anterior extremity issue two efierent 

 canals. The walls of these canals, close to the testis, are of a 

 lax tissue, containing a great quantity of fine fibres mixed with 

 cellular matters. The testis was filled with spermogenous cells, 

 all nearly equally developed, more or less rounded, and contain- 

 ing several fatty globules or drops of various sizes. Hence it is 

 probable that the ova, which were in the ovisac, were not yet 

 fecundated. 



Of this new form the author only obtained a single specimen, 

 which was found on a small individual of Pagurus Bernhardus, 

 on the coast of Bohuslaen. All the figures are from the animal 

 preserved in spirit. 



The author gives the following tabular view of the genera 



