28 Prof. T. R. Jones and Mr. J. W. Kirkby on 



Fig. 4. Chorilibinia gracilipes, male individual: X 1J diara. 4«. Lateral 

 view of carapace of the same, showing the disposition of the 

 dorsal spines: X 1^ diam. 



Fig. 5. Paramithrax ( Paramithrax) spinosus, male individual : nat. size. 



Fig. 6. Pisa carinimana, male individual, X 1| diam. 6 a. Outer view 

 of hand of the same : X 3 diam. 



Fig. 7. Hyastenus gracilirostris, male individual : X 1 \ diam. 



Fig. 8. Lateral view of front of carapace and rostrum of Pseudomicippe 

 varians, male individual : X 3 diam. 8 a. Lateral view of the 

 same parts hi a female individual, showing variation in the 

 form and direction of the rostral spines : X 3 diam. 



Fig. 9. Micippe parvirostris, female individual : nat. size. 



Plate V. 



Fig. 1. Carapace of Othonia quadridentata : nat. size. 



Fig. 2. Parathoe rotundata, male individual : X 2 diam. 2 a. Inferior 

 view of frontal and antennal region of the same : X 4 diam. 



Fig. 3. Lambrus Holdstvorthi, female individual : nat. size. 



Fig. 4. Lambrus Icevicarpus, male individual : nat. size. 



Fig. 5. Lambrus dejiexifrons, male individual : nat. size. 5 a, Lateral 

 view of front of the cephalothorax of the same, showing the 

 deflexed rostrum : X 2 diam. 



Fig. G. Front of carapace and rostrum of Lambrus hoplonotus, var. longi- 

 oculis : X 3 diam. 



Fig. 7. Front of carapace and rostrum of L. hoplonotus, var. planifrons : 

 X 2 diam. 



Fig. 8. Lambrus (Parthenopoides) erosus, male individual : x 1| diam. 



Fig. i). Lambrus (Parthenopoides) expansus, male individual: X 1| diam. 



Fig. 10. Cryptopodia spatulifrons, male individual : nat. size. 



Fig. 11. Ceratocarcimis spinosus, female individual : X 2 diam. 11 a. In- 

 ferior view of antennal and orbital region of the same : further 

 magnified. 11 b. Outer view of hand : further magnified. 



II. — Notes on the Palceozoic Bivalved Entomostraca. No. 

 XII. Some Carboniferous Species belonging to the Genus 

 Carbonia, Jones. By Professor T. Rupert Jones, F.R.S., 

 and James W. Kirkby 3 Esq. 



[Plates II. & III.] 



In previous papers on Carboniferous Entomostraca we have 

 attempted to show, and critically examine, what has been 

 already done in investigating this interesting though some- 

 what difficult group of fossils. 



In a paper published in May 1865 *, we gave the result 

 of an examination of a series of specimens from Bavaria, 



* Ann. & Mag. Nat. Hist. ser. 3, vol. xv. p. 404. 



