302 NOTE ON A DECAPODOUS CRUSTACEAN FROM QUEENSLAND, 



Meyer {Oj). cit., figs. 27 and 28) ; P. aeqmcm, Meyer (Op. cit., fig. 29) ; 

 P. torosum, Meyer (0^?. cit., fig. 30) ; P. imradoxum, Meyer {Op. cit., 

 fig. 31) ; and P. tuberosum, Meyer [O]). cit., fig. 33). With the 

 exception of the last-named species, which is from Boucherans, 

 these are all from the White Jura of the Oerlinger Thai, in 

 WiirtemVjurg. 



I have also figured and described a species belonging to the 

 genus Prosopon (P. mammillatum, H. Woodw.), from the Great 

 Oolite of Stonesfield, near Oxford (see Geol. Mag., 1868, Vol. v. 

 pi. I. fig. 2, pp. 3-5). In noticing this species I have endeavoured to 

 analyse the series of twenty-nine species of Prosopon described by 

 H. von Meyer in the Palaeontographica, 1860, and have pointed out 

 that certain of these forms do not belong to the genus Prosopon, 

 but should be relegated to the Pinnotheridce under the genus 

 Plagioplithalmus of Bell* Into this genus should be removed all 

 those forms at present included under the genus Pi'osopon, which 

 have " an evenly egg-shaped carapace with the front slightly 

 produced and bent downwards, the surface nearly smooth, and 

 marked by two shallow transverse furrows, nearly parallel to 

 each , other, the orbits very small, elongate-oval, aud placed 

 obliquely within the margin, appearing as if pierced in the 

 substance of the carapace." (Bell, Oj). cit. p. 9.) 



Plagiojjhthalmus, Bell, would thus probably include within it 

 the following species of H. von Meyer's genus Prosopon, namely, 

 Prosopon hebes, P. simplex, P. rostratutn, P. spinosum, P. 

 elongatuvi, P. depressum, P. obtusum, P. stotzinyense, P. sublceve, 

 P. Iceve, P. punctatum.f The following are doubtful : P. insigne, 

 P. cequilatum, P. marginatum, P. grande, P. excisum, and P. 

 liyigulatum. They all occur merely as small detached carapaces 

 without appendages, and the underside of the fossil usually 



* See Pi-of. Bell's Monograph on the Fossil Malacostracous Crustacea 

 from the Gault and Greensand (Palaeontographica! Society's Vol. xiv. for 

 1860), Part ii. p. 9, pi. ii. 



1 1 now retain Prosopon tuherosum, fomierly excluded by me. 



