. Smithsonian miscellaneous collections . y ranking in developmentbetween Apus and the trilobite. Anaspidacea.—The most striking instance of similarity of thethoracic limbs of a trilobite and those of a recent crustacean is that ofthe thoracic limbs of Neolenus which strongly suggest those of theMalacostracan genus Anaspides,1 a crustacean of the order Syn-carida, found in a fresh-water pool in Tasmania, New Zealand. Theresemblance is shown by the presence in both of a strong ambulatoryjointed leg (endopodite), a jointed setiferous exopodite, and two 1 Smithsonian Misc. Coll., Vol. 57, 1910, p
. Smithsonian miscellaneous collections . y ranking in developmentbetween Apus and the trilobite. Anaspidacea.—The most striking instance of similarity of thethoracic limbs of a trilobite and those of a recent crustacean is that ofthe thoracic limbs of Neolenus which strongly suggest those of theMalacostracan genus Anaspides,1 a crustacean of the order Syn-carida, found in a fresh-water pool in Tasmania, New Zealand. Theresemblance is shown by the presence in both of a strong ambulatoryjointed leg (endopodite), a jointed setiferous exopodite, and two 1 Smithsonian Misc. Coll., Vol. 57, 1910, p. 193, pis. 25, On the genus Anaspides, W. T. Caiman, Trans. Royal Soc. Edinburgh,Vol. 38, Pt. 4, 1896, P- 79i, pl- 2, fig. 12. no. 4 APPENDAGES OF TRILOBITES I7I jointed flabelliform epipodites attached to the proximal joints (coxop-odite and basopodite) of the limb. Whether or not the plate-likelobes shown beside the median lobe of the dorsal shield in figures 3and 4, plate 20, of Neolenus can be compared with the internal lobes. ANASPIDES TASMANIA G. M. Thomson Fig. 1 ().—Side view of male illustrated here to show thoracic legswith exopodites and epipodial lamellae. This species is without dorsal shield.(After Caiman, Trans. Royal Soc. Edinburgh, Vol. XXXVIII, pt. iv, 1896,pi. 1, fig. 1.)
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