W. Lilljeborg on the Genera Liriope and Peltogaster. 55 



those in which this is wanting they have cellular and viscid 

 contents. No sperniatozoids were detected in them. The canal 

 issuing from them is compact and strong, but narrow and tor- 

 tuous ; at the part attached to the testis it has a flask-shaped 

 dilatation of a less solid consistence. In the specimen figured 

 (fig. 8), one of the canals had in the middle a short csecal branch, 

 and also an apophysis at the extremity attached to the oviferous 

 sac ; these were w anting in the other canal. At the point where 

 the canal terminated, the membrane surrounding the oviferous 

 sac was thicker, uneven, rugose and brownish, apparently indi- 

 cating that a deposition of cement had taken place. The canal 

 being attached to the oviferous sac seems to prove that the ova 

 are not fecundated until after leaving the ovary. 



The oviferous sac (fig. 8 d) is voluminous, surrounds the 

 ovarian sac above and along the sides, and forms the greater 

 part of the contents of the Peltogaster. It is everywhere enve- 

 loped in a delicate pellucid membrane, having small and more 

 or less distinct irregular cells ; it is slightly attached by connec- 

 tive tissue both to the muscular membrane of the pallium and 

 to the ovarian sac. The membrane surrounding the oviferous 

 sac appears to be exactly analogous to those which in Sacculina 

 are placed closest to the oviferous tubes. Within are the ova, 

 held together by cement, just as in the ovisacs of Cyclops. The 

 oviferous sac corresponds with the oviferous tubes of Sacculina. 

 Its colour was yellowish red, but varies according to the deve- 

 lopment of the ova. 



From these observations, the author's previous statements re- 

 garding the ovaries (Annals, vol. vi. pp. 166, 167) must be sup- 

 pressed. The portions described and figured by him as "pri- 

 mitive ovaries " are the testes, enveloped by their sacs. The 

 supposition that the animals perish after having once produced 

 their ova (p. 167) is also erroneous. The author has found in 

 the same individual of P. sulcatus, hatched young in the ovife- 

 rous sacs, and large eggs, filled with yellowish vesicles, in the 

 ovaries. After the escape of the young, the oviferous sac is 

 probably destroyed, as is the case in Cyclops and Sacculina; 

 the new ova are then probably enclosed in a new oviferous 

 sac. 



The author on one occasion met with a small specimen of this 

 species in which he could discover no trace of the anterior orifice 

 of the pallium. He at first took it for a distinct species, but the 

 form of its organ of adhesion and of its testes showed it to be- 

 long to P. Paguri. It was three millim. in length, and the 

 colour of its oviferous sac was a deep brownish red. It was 

 attached to P. elm-acanthus, Lillj. This closed structure of the 



