42 Notices of Memoirs — 



Its lateral moieties are not free, separate valves, but united by an 

 antero-dorsal suture for a third of its length, and by an antero- 

 ventral suture for half of its length, the posterior region remaining 

 open at the edges. It also shows in front a round aperture, with 

 a sulcus formed b}'^ the somewhat inverted edges below it. The 

 test is nearly oval and compressed; thickest and subacute in front; 

 bearing a small, low, subcentral swelling. The surface has some 

 reticulate ornament along the margins for the most part, succeeded 

 by linear, radiating, and concentric sculpture towards the more 

 convex area, which is finely punctate. It is 6 mm. long, 4 mm. high, 

 and 1'5 mm. thick. 



In S. A. Miller's "North-American Geology and Palgeontology," 

 2nd edition, 1889, p. 549, fig. 1,009, an allied form is described and 

 figured as Fnheria anomnio, n. sp. et gen., from the Hudson-Kiver 

 group, Ohio (Lower Silurian). This has evidently some analogy to 

 the foregoing Upper Silurian form. It has a compressed, ovoidal, 

 smooth shell, consisting of two moieties, partially sutured above and 

 below, and is rather smaller than the German specimen. 



§ II. 1885-1894. Cambrian Phyllopoda (?).— Dr. G. F. Matthew, 

 of St. John, New Brunswick, has discovered several very small 

 organisms in the Cambrian rocks of North-Eastern America, some 

 of which he regards, with doubt, as having been carapace- valves of 

 Phyllopodous Crustaceans. He has described and figured them in 

 the Transactions of the lioyal Society of Canada. 



To this group of small subtriangular valve-like bodies, obliquely 

 semicircular or semi-elliptical, with straight hinge-line and more or 

 less definite umbo, belong (1) Lepiditta alota, M., 'J'rans. Roy. 

 Soc. Canada, vol. iii, 1885, sect. 4, p. 61, pi. vi, figs. 16, 16rt ; 

 (2) L. curta, M., p. 62, pi. vi, fig. 17 ; (3) Lepidilla^ nnomala, M., 

 p. 62, pi. vi, figs. 18, 18a, b, c; (4) Lepiditta sigillata, M., xi, 1894, 

 sect. 4, p. 99, pi. xvii, fig. 1 ; (5) L. auriculata, M., p. 99, pi. xvii, 

 figs. 2, 2a, b. Some of these were referred to by us in the Sixth 

 Report (for 1888), p. 174. 



§ III. 1889. Bhachira venosa, Scudder, 1878, Proc. Boston Soc. 

 Nat. Hist., vol, xix, p. 296, pi, ix, figs. 3, 3a (referred to in our 

 Report for 1883, p. 216). Dr. A. S. Packard, having received from 

 M. Gurley some imperfect specimens found in the Middle Coal- 

 measures, Danville, Illinois, describes them as being parts of 

 a carapace, probably a little over three inches long, and three 

 caudal spines, also rather obscure (Proc. Boston Soc. Nat. Hist., 

 vol. xxiv, 1889, pp. 212, 213). 



§ IV. 1893. Rhinocaris colmnbina. — Mr. J. M. Clarke has con- 

 tributed a paper " On the Structure of the Carapace in the Devonian 

 Crustacean Ehinocaris, and the relation of the Genus to Mesothyra 

 and the Phyllocarida," with illustrative cuts, published in the 

 American Naturalist, Sept. 1, 1893, pp. 793-801. The carapace- 

 valves of Rhinocaris columbina (J. M. C., " Palseont. New York," 



1 Dr. G. F. Matthew, in a letter of November 5, 1897, expresses a "wish to 

 withdraw LepidiUa, as not being a Crustacean : more perfect specimens seem 

 to show a fan-like structure of internal tubes." 



