ME. E. J. MIEES OK THE OXTSTOMATOUS CEUSTACEA. 107 



rian. In all these figures, c, cerebrum ; o, optic lobe ; C7ti, cerebel- 

 lum; s, squamosal region. 



Fig. 6, Vertical diagram of the carpus of Ornithocheirus, for comparison with 

 fig. 7. 



Fig. 7. Vertical diagram of the carpus' of an Ostrich {Struthio camelus). In 

 these figuers, p, lateral carpal ; q, proximal carpal ; r, distal carpal. 



Fig. 8. Tibia and fibula of Dimor'p'hodon from the Lias, from a photograph of 

 a specimen in the British Museum : t, tibia ; /, fibula ; a, anchylosed 

 tarsal element, f nat. size. 



Fig. 9. Diagram outhne of proximal surface of distal carpal of Ornithocheirus, 

 showing separation into : — m, magnum ; td, trapezoid ; u, unciform. 



Fig. 10. Diagram of distal surface of same distal carpal, showing ^?j, deep pneu- 

 matic foramen at the confluence of the three bones, and outlines of 

 the positions of articular surfaces for three metacarpal bones. The 

 eridence for these diagrams is in the Woodwardian Museum. 



Fig. 11. Longitudinal section of a tooth of Ornithocheirus, curved from end to 

 end, showing close-set radiating calcigerous tubes. Enlarged f . 



Fig. 12. Transverse section from the base of the crown of a large tooth of Orni- 

 thocheirus from the Cambridge Upper Greensand. Enlarged f . 



Notes upon tlie Oxystomatous Crustacea. 

 By Edwaed J. MiEES, Esq., F.L.S. 



[Eead June 15, 1876.] 

 (Abstract.) 

 In this paper (which will be published shortly in the Society's 

 Transactions with illustrations) the author first enters into the 

 literature of the subject, and then gives descriptions of species of 

 the family Leucosiidse. 



Of the genus Leucosia there are in the British Museum eight 

 species hitherto unrecorded ; and these are now named and may be 

 enumerated as follows : — 



L. fusco-maculata. L. reticulata. 



L. pulcherrima. L. wJiitmeei. 



L.qffinis. L. perryi. 



L. hrunnea. L. puhescens. 



A variety of Myra mamillaris, Bell, is noted, possibly an imma- 

 ture example ; and he suggests that the M. carinata and M. ele- 

 gans of Bell may turn out not to be adult animals. 



Nursia sinuata is referred to as a new Australian form ; and 

 comparisons between what have been termed iV. plicata, N. abhre- 

 viata, and N. hardwickii are instituted. Arcania granulosa and 

 Cryptocnemius JioldswortJii, respectively from Australia and Ceylon, 

 are considered among the new species. 



