38 Crust. 
CRUSTACEA. 
J. Dewitz has observed that the shell of the Trilobites is perforated 
by fine pores, by which the surface is rendered punctate; B. E. Z. 
XXV. pp. 87 & 88. 
The supposed Crustacean Prosopistoma (Dumcril) = “ hinocle d queue 
eniilumeV' (Geoff roy) is at last proved to be an insect of the family 
EpTiemeridce, nymph and sub-imago being described by A. VAYSSitiiiE, 
Ann. Sci. Nat. (6) xi. art. 1, 16 pp. 1 ph, translated in Ann. N. H. (5) 
viii. pp. 73-85, pi. x. {^Cf. also Zool. Rec. xvii. Ins. p. 213.] 
