W. Lilljeborg on the Genera Peltogaster and Liriope. 165 



culatis destitutum. Os in organo adfigendi subinfundibuliformi 

 vel acetabuliformi plus vel minus corneo, absque appendicibus 

 buccalibus, in latere inferiore corporis situm. Ad extremitatem 

 unam (anteriorem) corporis apertura, interdum magna, interdum 

 parva, cavitatem generalem corporis internam aperiens adest*. 

 Nullum corpus internum carnosum adest nullusque ventriculus a 

 cavitate corporis distinctus, quare hsec cavitas, quae intus, sub 

 cute firma et transverse fibrosa, membrana tenui pellucida sat vero 

 firma est vestita, et ad alimentum digerendum vel saltern adser- 

 vandum, et ad ovaria complectanda servit. Genitalia bisexualia ? 

 Partes duae subclavatse vel sacculiformes (? testes vel vesiculae 

 seminales), pedunculo vel canali ad membranam internam cavitatis 

 corporis sub ovariis adfixaef. Ovaria duo, in principio in fundo 

 cavitatis corporis supra et inter partes illas duas sacculiformes 

 adfixa, juxta sese posita, extus sacciformia, intus acinosa, mem- 

 brana cellulosa circumdata, et demum totam cavitatem corporis 

 explentia, et inter se ita coalescentja, ut vix disjungi possint. 

 Pulli iisdem antecedentis similes, entomostraciformes, cum Cirri- 

 pediorum pullis processibus lateralibus a parte anteriore et infe- 

 riore corporis exeuntibus congruentes, sed tamen etiam formam 

 pullorum Lernseidarum referentes. 



From their more simple internal structure, the deficiency of a 

 fleshy internal body, and the sacciform ovaries which occupy 

 the whole cavity, the author considers that these animals form 

 not only a distinct genus, but even a distinct family. This pre- 

 sents some analogies with Darwin's order Apoda. The structure 

 of the larva and of the mature animal, which is probably herma- 

 phrodite, appears to prove that both Peltogaster and Pachybdella 

 belong to the Cirripedia. 



The form of the body in Peltogaster is cylindrical, sometimes 

 a little flattened, and the aperture leading into the cavity of the 

 body is placed at one of its extremities. These characters 

 distinguish Peltogaster from Pachybdella. In other respects the 

 two genera are similar. The body in Peltogaster is sacciform, 

 enveloped in a soft and smooth, more or less compact and trans- 

 parent skin, which has externally a very fine, transparent, struc- 

 tureless, chitinous epidermis, and under this a thicker and less 

 transparent dermis, of fibrous structure, and furnished with 

 transverse fibres. The thickness and opacity of this skin vary 

 in different species, and even apparently in individuals of the 

 same species, according as the internal parts are more or less 

 developed. Within the dermis is a delicate transparent mem- 

 brane without epithelium, slightly attached to the dermis by an 



* Rathke regarded this orifice as a mouth. 



f Rathke, perhaps correctly, regards these as male sexual organs, and 

 therefore believes the animals to be hermaphrodites, which is also the case 

 in the Cirripede which approaches them most closely, although it is still 

 very different — namely, Darwin's Proteolepas. 



