[7.] Terminal part (magnified seven times), of the peduncle of an elongated specimen of [Scalpellum vulgare], slit open, with the corium removed, showing the two cement-ducts (aa), and a row of circular patches (bb) of cement, by which the peduncle, along its rostral edge, is attached to the thin horny branches of the coralline. The larval antennæ are seen at the terminal point, and the two cement-ducts can be traced into them.
![[7.]](#475865927904411783_p09f7.png.id-8405726469359836225.wrap-0.html.html){kind=link}
![[TAB. X.]](#475865927904411783_p10.png.id-7219071785438943482.wrap-0.html.html){kind=link}
Figures all greatly magnified.
Fig.
[1.] Mandibles of [Pollicipes mitella]: exhibiting the upper (a) and lower (b) articulations, and the three principal muscles; the short upper cut off muscle runs to its attachment at the base of the palpus.
![[1.]](#475865927904411783_p10f1.png.id-5024509340249726973.wrap-0.html.html){kind=link}
[2.] Mandibles of [Lithotrya dorsalis], exhibiting four (aa) roughened, thin, ligamentous apodemes for the attachment of the muscles.
![[2.]](#475865927904411783_p10f2.png.id-6177625874303791450.wrap-0.html.html){kind=link}
[3.] Mandibles of [Scalpellum Peronii].
![[3.]](#475865927904411783_p10f3.png.id-5805079502291327908.wrap-0.html.html){kind=link}
[4.] Mandibles of [Ibla Cumingii].
![[4.]](#475865927904411783_p10f4.png.id-144193146859576727.wrap-0.html.html){kind=link}
[5.] Mandibles of [Lepas anatifera].
![[5.]](#475865927904411783_p10f5.png.id-5154090972135719402.wrap-0.html.html){kind=link}
[6.] Palpus of [Lepas anatifera].
![[6.]](#475865927904411783_p10f6.png.id-3684268483344317819.wrap-0.html.html){kind=link}