Quarterly journal of microscopical science . t. So far as the term vertebrate is concerned, we might,of course, legitimately disregard its signification. There isno reason why some Vertebrata should not be inaccurately de-scribed as vertebrate, just as some Arthropoda are notarthropodous, some Chsetopoda not chsetopodous, and someGastropoda not gastropodous. On the other hand, if we accept the term * vertebrate notas implying the possession of bony or cartilaginous vertebrae(as Balfour proposed), but as meaning jointed or meta-merised, then it appears that even amongst the Urochorda orTunicata
Quarterly journal of microscopical science . t. So far as the term vertebrate is concerned, we might,of course, legitimately disregard its signification. There isno reason why some Vertebrata should not be inaccurately de-scribed as vertebrate, just as some Arthropoda are notarthropodous, some Chsetopoda not chsetopodous, and someGastropoda not gastropodous. On the other hand, if we accept the term * vertebrate notas implying the possession of bony or cartilaginous vertebrae(as Balfour proposed), but as meaning jointed or meta-merised, then it appears that even amongst the Urochorda orTunicata, facts justifying its use in relation to them may bediscovered. Apart from the verbal question, it is a matter of some im-portance that indications of metamerised structure should occurin the Urochorda. VOL. XXII. NEW SER. C C 388 PllOifESSOR E. RAY LANKESTER. Some years ago (1871—72) I made some observations atNaples on the structure of Fritillaria furcata, which satisfiedme that the rmisculattire of the tail of that animal is broken up. Fig, 1.—Appendicularia {Fritillaria) furcata. Surface views. Magnifiedabout seventy diameters, a. Lateral superficial view of Fritillariafurcata. B. A similar view from the veutral surface, c. A similarview from the dorsal surface. lu this figure the alimentary tract andthe nervous axis are seen through the transparent integuments. _ into a series of myomeres, seven in number, one corresponding toeach pair of nerves given off by the axial nerve-cord. The drawings VERTEBilATION OF THE TAIL OK APPENDICULAR!^. 389I
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