344 REPORT— 1897. 



circular or semi-elliptical, with straight, hinge-line and more or less definite 

 umbo, belong (1) Lepiditta alata, M., 'Tr. R. S., Can.,' vol. iii. 1885, 

 sect. 4, p. 61, pi. vi., figs. 16, 16a ; (2) L. curta, M., p. 62, pi. vi., 

 fig. 17 ; (3) Lepidilla anomala, M., p. 62, pi. vi., figs. 18, 16 a, b, c ; (4) 

 Lepiditta sigillata, M., vol. xi. 1894, sect. 4, p. 99, pi. xvii., fig. 1 ; (5) 

 L. auriculata, M., p. 99, pi. xvii., figs. 2, 2 a, b. Some of these were re- 

 ferred to by us in the Sixth Report (for 1888), p. 174. 



§ III. 1889. Rhachura venosa, Scudder, 1878, 'Proceed. Boston 

 Soc. Nat. Hist.,' vol. xix. p. 296, pi. ix., figs. 3, 3a (refen-ed 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 

 (' Proceed. Boston Soc. Nat. Hist.,' vol. xxiv. 1889, pp. 212, 213). 



§ IV. 1893. Rhinocaris columbina. — Mr. J. M. Clarke has contri- 

 buted a paper ' On the Structure of the Carapace in the Devonian Crusta- 

 cean Rhinocaris, and the relation of the Genus to Mesothyra and the 

 Phyllocarida,' with illustrative cuts, published in the ' American Natural- 

 ist,' September 1, 1893, pp. 793-801. The carapace-valves of Rhinocaris 

 columbina (J. M. C, ' Palieont. New York,' vol. vii. 1888, pp. Iviii. and 

 195-197) are described from better specimens, which show it to be a 

 bivalved (not univalved) form, and as having a narrow, median plate, of 

 which there is evidence in Mesothyra, making a double dorsal suture. 

 There is also a long, narrow, leaf-like rostrum inserted between the valves 

 in front. The relationship of this form with Mesothyra and Tropidocaris 

 is dwelt upon. The author thinks that Dithyrocaris and Emmelezoe have 

 some aflfinity with it. Rhinocaris and Mesothyra are regarded as typical 

 members of the family Rhinocaridce. We may mention that Dr. Matthew 

 regards his Ceratiocaris pusilla from the Silurian of New Brunswick (see 

 'Trans. Roy. Soc, Canada,' vol. vi. 1888, sect. 4, p. 56, pi. iv., fig. 2 ; and 

 our Seventh Report (for 1889), p. 64, as Rhinocaris. 



§ V. 1895. Emmelezoe Lindstroemi. — Since our Twelfth Report, 

 presented to the British Association at Ipswich in 1895, the Swedish 

 Phyllocarids mentioned in that Report as having been found by Dr. 

 Gustav Lindstrom in the Upper Silurian beds at Lau, Gothland, have 

 been duly described and figured in the ' Geological Magazine,' decade 4, 

 vol. ii.. No. 378 ; December, 1895, pp. 540, 541, pi. xv., figs. 2a-2d, as 

 Emmelezoe Lindstroemi, J. &, W. The fish remains (Cyathasjns) and other 

 fossils associated with it are mentioned in detail by G. Lindstrom in the 

 'Bihang till K. Svensk. Vet.-Akad. Handl.' vol. xxi. part 4, No. 3, 1895, 

 pp. 11, 12. 



Mr. J. M. Clarke has suggested at p. 801 of his memoir mentioned in 

 § IV. that the oculate genus Emmelezoe may have some relationship to 

 the group to which Rhinocaris belongs. 



§ VI. 1895. Pinnocaris LajJivorthi. — This genus, represented by its 

 only known species, P. Lajnoorthi, has been carefully examined by 

 Woodward and Jones, and several specimens described, selected from a 

 large number in Mrs. Robert Gray's collection at Edinburgh. This 

 memoir appeared in the ' Geological Magazine,' decade 4, vol. ii. 1895, 

 pp. 542-545, pi. XV., figs. 5-10. Excepting one specimen from the 

 Upper Silurian of Kendal, Westmorland, all the known specimens are 



