164 W. Lilljeborg on the Genera Peltogaster and Liriope. 



and here it is attached to the inner surface of the skin (pallium). 

 Except at this point, the body is everywhere surrounded by the 

 external ovaries, resembling ramose caeca (fig. 7 d). The 

 structure of these resembles that of the external band-like ovaries 

 described by Leuckart (Annals, ser. 3. vol. iv. p. 428, pi. 7. fig. 6) : 

 according to Lilljeborg, they are contained in one, or perhaps 

 two sacs formed of a delicate transparent membrane, which 

 presents the appearance of an epithelium with irregular cells. 

 The figure of the young animal given by Cavolini (copied in 

 fig. 17) presents a closer resemblance to that of a newly-hatched 

 larva of a Cirripede than that of Peltogaster, as observed by the 

 author and Lindstrom. 



Sp. 1. Pachybdella Carcini, Rathke. (PI. IV. figs. 6 & 7.) 



Animal supra et infra leviter sinuatum ; partes laterales obtusse ; 

 acetabulum rhomboideum, marginibus simplicibus, non multum 

 expansis. Color rufescenti-flavidus. Latitudo circ. 17-20, et 

 crassitudo 9-12 millim. 



Peltogaster Carcini, H. Rathke, Beitrage zur Fauna Norwegens, Acta 



Leop. xx. p. 247, tab. 12. figs. 18, 19. 

 Pachybdella Rathkei, Diesing, Syst. Helm. i. p. 435. 



It is found under the abdomen of Carcinus Mcenas, attached 

 over the intestinal canal, usually singly, sometimes two together. 

 Also met with on Portunus marmoreus, and, according to Steen- 

 strup, on Portunus hirtellus in the Mediterranean. Loven has 

 met with it on the abdomen of a Hyas. 



The author adds that it is probable there may be several spe- 

 cies of the genus, and, judging from Cavolini's figures, that he 

 had more than one species under his eyes. 



[As Leuckart has indicated (/. c. p. 424), the generic name 

 Pachybdella must be changed to Sacculina, Thompson, and the 

 species above described will stand as Sacculina Carcini, Thomp- 

 son. We have also to add the species, Sacculina inflata, described 

 by Leuckart.] 



Genus Peltogaster, Rathke. 



Reisebemerkungen, Neueste Schrift. der Naturforsch. Gesellsch. 

 in Danzig, ii. p. 195 ; Beitr. z. Fauna Norw., Acta Leop. xx. 

 p. 244. 



From his observations on several new species of this genus, 

 the author gives the following character for it : — 



Animal e Crustaceorum classe et Cirripediorum subclasse, ecto- 

 parasiticum, in abdomine Paguri degens. 



Animal adultum. Corpus sacciforme, elongatum, teretiusculum, vel 

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

 obtectum, minime segmentatum, et partibus appendicularibus arti- 



