60 



REPORT- 1887. 



Association the sum of 501., placed at their disposal for that purpose ; and 

 they hope that the Council will continue theii' support to this national 

 undertaking, and that the grant may be not only renewed but increased 

 for the ensuing year. 



Fifth Report of the Committee, consisting of IN'Ir. K. Etheridge, 

 Dr. H. Woodward, and Professor T. Rdpert Jones (Secretary), 

 on the Fossil Phyllopoda of the Palceozoic Rocks, 1887. 



§ I. Ceratiocaris tyrannus and C. 



patula. 

 § II. Scandinavian Phyllocarida. 



1. Ceratiocaris Angelini, sp, n. 



2. C. Bohemica, Barrande. 



3. 4, 5. G, Bohemica, varieties. 



6. Ceratiocaris, sp. nov. 



7. C. concinna, sp. nov. 



8. C. Scharyi, Barr., var. 



9. C. pectinata, sp. nov. 



10, 1\. Phasgarwcaris pitgio (Barr)., 

 var. serrata, nov. 



§ III. JDithyrocaris. 



I. Upper-Carboniferous Species. 



II. Lower-Carboniferous Species 



and Specimen formerly re- 

 ferred to Bithyrocaris. 



III. Devonian Species of Bithy- 



rocaris. 



IV. Silurian Specimens formerly 



referred to Bithyrocaris. 

 § IV. Leaia. 



List of known Species of Leaia. 

 § V. Palseozoic Species of Estheria. 



§ I. Ceratiocaris tteannus and C. patula. — Continuing our researches 

 on the Ceratincaricles, especially with a view to a monograph in preparation 

 for the PalEeontographical Society, we have found that the species which 

 we proposed to name Ceratiocaris attenuata (Fourth Report, Brit. Assoc. 

 Rep. for 1886, p. 230) is really the same as C. tyrannus, Salter MS., and 

 of course we adopt the latter name. 



The term lata having been already applied to a species of Ceratiocaris, 

 we use the designation patula for the little Lower-Ludlow form named 

 lata in our Fourth Report. 



§ II. Scandinavian PHYLLOCAEiDA.^Some Phyllocarida from the 

 Silurian strata of Scandinavia (Sweden and the island of Gothland) are 

 represented by specimens in the State Museum at Stockholm. Draw- 

 ings, casts, or the specimens themselves have been shown to us by our 

 friend Professor Gustav Lindstrom, F.C.G.S., and we have arrived at 

 the following conclusions as to their relationships [all except the first 

 (Ceratiocaris Angelini) are from Upper- Silurian strata] : — 



1. Ceratiocaris Angelifii, sp. nov. — A long, stout, trifid caudal append- 

 age, consisting of the style or telson (145 mm. long, and 17 mm. broad at 

 the top) and two stylets (each 75 mm. long) lying close together. One 

 of the latter has been broken across by a crush, and the former is not quite 

 perfect at the tip (possibly 15 mm. longer or more originally). The 

 lower (ventral) surface only is shown. The articulation of the stylets 

 with and beneath the shoulders of the style — that is, under the backward 

 extension or overhanging hinder edge of its head or proximal end — is 

 very distinct. The upper edge of this part of the style (the surface arti- 

 culating with the ultimate segment) has an undulated profile, with two 

 small, projecting, asymmetrical, curved, horn-like processes. 



The style on thisits lower aspect has a deep groove along the middle 



