English: Alder, Joshua, Embleton, Dennis, Hancock, Albany, Hopkinson, John,Norman, Alfred Merle ,1905-12 The British Tunicata; an unfinished monograph, by the late Joshua Alder and the late Albany Hancock. Edited by John Hopkinson, with a history of the work by the Rev. A. M. Norman.London,Printed for the Ray Society. Volume 1 Plate 18

PLATE XVIII.

THE BRANCHIAL SAC.

FIG. 1. Acidia aculeata Alder, (p. 115) accepted name Ascidiella aspersa (Müller, 1776) 2. A. amoena sp. nov. (p. 117)accepted name Ascidia conchilega Muller, 1776 3. A. plebeia Alder (p. 118)accepted name Ascidia conchilega Muller, 1776 4. A. sordida A. & H. (p. 121)accepted name Ascidiella aspersa (Müller, 1776) 5. A. canina Müll. (p. 123) accepted name Ciona intestinalis (Linnaeus, 1767) 6. A. obliqua Alder (p. 125) accepted as Ascidia obliqua Alder, 1863 7. A. scabra Müll. (p. 130) accepted name Ascidiella aspersa (Müller, 1776) 8. A. Normani A. & H. (p. 133) accepted name Ascidiella aspersa (Müller, 1776) 9. A. affinis A. & H. (p. 137) accepted name Ascidiella aspersa (Müller, 1776) 10. A. pustulosa Alder (p. 139) accepted name Ascidiella aspersa (Müller, 1776) 11. A. elliptica A. & H. (p. 141) accepted name Ascidiella aspersa (Müller, 1776) 12. A. pellucida A. & H. (p. 143) accepted name Ascidiella aspersa (Müller, 1776)

All the figures much enlarged, but reduced in various proportions from Mr. Hancock's drawings.