62 W. Lilljeborg on the Genera Liriope and Peltogaster. 



Animal adultum : Corpus sacciforme, elongatum, teretiusculum, 

 vel depressiusculum, cute (pallio) plus vel minus pellucida sed firma 

 vestitum, minime segmentatum, et partibus appendicularibus articu- 

 latis destitutum. Os vel apertura suctoria in organo adfigendi sub- 

 infundibuliformi, vel acetabuliformi, vel etiam tubiformi, plus vel 

 minus corneo, in latere inferiore corporis situm, appendicibus bucca- 

 libus nullis. Ad extremitatem unam (anteriorem) corporis plerum- 

 que apertura, interdum magna, interdum parva, cavitatem intra- 

 pallialem aperiens adest. Nullum corpus internum crassum et car- 

 nosum, ut apud Sacculinam, nullusque ventriculus adest, saccum vero 

 internum musculosum, ovaria amplectens, invenimus. Genitalia bi- 

 sexualia. Testes duo simplices tubiformes vel sacculiformes, infra 

 saccum ovariorum positi, uterque canaliculo ad saccum oviferum ad- 

 fixus. Ovaria duo sacciformia, plus vel minus ramosa vel lobata, et 

 sacco communi inclusa. Ova, quum ex ovariis exierunt, in sacco 

 magno, ovariorum saccum communem supra et ad latera obtegente, 

 adservantur. 



Pulli pullis antecedentis similes, entomostraciformes, cum Cirri- 

 pediorum pullis processibus lateralibus a parte anteriore et inferiore 

 corporis exeuntibus congruentes. 



EXPLANATION OF PLATES IL & Illf. 



Plate IL 



Figs. 1 to 4, Sacculina Carcini. 



Fig. 1. The animal, of the natural size : a, the organ of adhesion; b, the 

 orifice of the pallium*. 



Fig. 2. The internal or ovarian body, of the natural size : a, the orifice of 

 the mouth or sucker ; b, the thick muscular membrane around 

 the orifice of the pallium ; c, the aperture through which the 

 internal ovaries issue and communicate with the oviferous tubes ; 



d, a portion of the second and third membranes of the pallium ; 



e, a portion of the outer chitinous membrane of the pallium*. 

 Fig. 3. A testis (?) : a, the apical portion, which is compact and whitish ; 



b, the basal portion, which is more lax and cellular*. 

 Fig. 4. A portion of the cement-gland (?), magnified 200 diameters*. 



Figs. 5 to 7, Clistosaccus Paguri. 



Fig. 5. A large specimen attached to the abdomen of Pagurus Bernhardus : 

 a, the Clistosaccus ; b, the abdomen of the Pagurus. 



Fig. 6. The animal, opened : a, the portion situated beneath the skin of 

 the Pagurus ; b b, the ramose appendages ; c, the ovarian body ; 

 d d, lobes of the pallium ; e e, the skin of the Pagurus *. 



Fig. 7. One of the ramose appendages, more highly magnified. 



Figs. 8 & 9, Peltogaster Paguri. 



Fig. 8. An oviferous individual, of which the pallium has been detached : 

 a, the anterior extremity of the sac or ovarian body ; b, the pos- 

 terior extremity of the same ; c c, the testes ; d d, the oviferous 

 sac (magnified 25 diameters). 



Fig. 9. A testis : a, the testis; b, the efferent canal*. 



Fig. 10. Peltogaster sulcatus; the testis of a very young individual (the 

 same as represented in PI. III. fig. 4) : a, the testis ; b, a vesicle 



t The figures to which an * is affixed have been drawn from living specimens. 



