534 Dr. H. Woodward — Contributions to Fossil Crustacea. 



and only one pair of abdominal appendages are styliform and five 

 are branchial." 



Sucb characters as the above, however applicable to recent forms, 

 "cannot," as Messrs. Meek and Worthen well observe, "be often 

 made available for the investigation of crushed fossil species where 

 so many accidents might have occurred," to disarrange the natural 

 oi'der of the appendages. 



Having been favoured by Mr. Eobert F. Burnett, F.G.S., of 

 Manchester, with the loan of a specimen, obtained by him in 

 May, 1879, from the Middle Coal-Measures, Eiver Section, Irwell 

 Valley, which evidently belongs to the genus Palceocaris, I think 

 it sufficiently interesting to bring it under the notice of the readers 

 of the Geological Magazine, being its first occurrence in England. 



The specimen from Manchester exhibits the dorsal aspect of an 

 individual about 30 millimetres in length, and 3 mm. in breadth; 

 composed of a head, rounded in front, about 3 mm. in length ; 

 the somites, of which there are fourteen, each measuring about 

 2 mm. in length ; the telson or tail-spine which is linear-lanceolate 

 in form, is 5 mm. long, and the swimmerets are of equal length and 

 striated longitudinally. Each somite has from 8 to 10 parallel 

 strifle crossing it from side to side. The last 7 (abdominal) somites 

 have a tendency to diminish slightly in succession from before back- 

 wards, and have the angles of the posterior border of each segment 

 slightly produced. 



Two small rounded scales (which may he eyes, but certainly have 

 not the structure of eyes preserved), one being much more distinctly 

 evident than the other, are attached on either side, near the front of 

 the head. 



8ave these cephalic appendages (which do not seem to correspond 

 with any appendage on the head of Messrs. Meek and Worthen's 

 figures of Palcsocaris typiis, see woodcut), there are no other organs 

 attached to the body except the telson, and the lateral lobes of the 

 tail-fin. 



The well-marked transverse strije of the body-segments, their 

 nearly uniform breadth anteriorly, and the more marked tendency 

 of the abdominal rings to have their posterior border produced, with 

 their pleurae slightly prominent, together with the more narrow form 

 of the head, with its rounded scales, or eyes ? (reminding one casually 

 of the head of I'rosoponiscus problematicus from the Permian of 

 Durham), sufficiently entitle this form to be treated as specifically 

 distinct, and we therefore have much pleasure in dedicating it to 

 the discoverer, in whose collection the specimen is preserved. 



EXPLANATION OP PLATE XIV. 



Fig. L Hryon Neocomiensis, s^.noY. Lowest Cretaceous (Neocomian), Niederlishna, 



Silesia. Eoyal Bavarian Museum, Munich. 

 ,, 2. Eryon Stoddard, sp. nor. Stonesfield Slate (Great Oolite), Stonesfield, 



Oxfordshire. Coll. of the late Mr. W. W. Stoddart, Clifton, Bristol. 

 ,, 3. Palmocaris Burnetti, sp. nov. Middle Coal-measures, Eiver Section, IrweU 



Valley. Collection of E. F. Burnett, Esq., F.G.S., Manchester. 

 „ 4. Acanthotehon Stimpsoni, Meek and Worthen, Coal-measures, Morris, 



Grundv Co., Illinois. 



