Tol. 54.] THE DECAPOD CRUSTACEA OF ENGLAND. 21 



the urogastric and cardiac lobes is usually sharply marked. The 

 granulation of the surface of the carapace is remarkable ; the 

 summit of each granule is excavated and holds a minute central 

 papilla. The pterygostome is regularly and minutely granulated. 

 The epistome is slender, minutely granular, and has a median con- 

 dyloid tubercle on the anterior border which meets the apex of the 

 depressed rostrum. 



Bemarhs. — The carapace is the only portion known to me. I 

 have examined twelve or fourteen specimens, of which two are in the 

 British Museum, and six in my own collection. A single carapace 

 from the Chloritic Marl of Chard is in the Woodwardian Museum. 



A Tertiary species, described by Bittner, as Dromia Hilarionis,^ 

 bears considerable resemblance to Cyphonotus incertus ; both forms 

 appear to be distinctly referable to the same genus. 



Genus Plagiophthalmus, Bell. 

 Plagiophthalmtjs 0VIFOEMIS5 Bell. 



1863. Bell, Monogi'. pt. ii, p. 9 & pi. ii, figs. 1-3. 



1875. Frosojoon oviformis, Tribolet, Bull. Soc. geol, France, ser. 3, vol. iii, p. 457. 



Supplementary. — The details, both generic and specific, which 

 Bell has given as to the characters and conformation of the orbits 

 are probably inaccurate. I apprehend that this pretty little crus- 

 tacean was far more comely of feature than Prof. Bell recognized. 

 Careful examination of the specimens in the British Museum 

 (Cunnington Collection), which the distinguished author figured and 

 described, leads me to regard the small irregular depressions ' in the 

 substance of the carapace,' observable in one only of the specimens, 

 as really not the orbits but as accidental fractures. Large oval 

 depressions occupying the outer thirds of the orbito-frontal border, 

 as the artist has faintly but accurately represented in Bell's fig. 2 

 (pi. ii), are traceable in most of the specimens, and probably indicate 

 the true orbits. If this determination should be confirmed by the dis- 

 covery of better-preserved examples, the generic name, as indicating 

 squint, or oblique vision, would be literally inapplicable. 



Bell's figures (pi. ii) are enlarged to 1| natural size. 



Tribolet refers this species to the genus Frosopon, but probably a 

 reference to the subgenus Pithonoton would be more accurate. 



Distribution. — Upper Greensand, Warminster. 



Genus Homolopsis, Bell. 

 HoMOLOPsis Edwaedsii, Bell. (PL I, fig. 4.) 



1863. Bell, Monogr. pt. ii, p. 23 & pi. v, figs. 1 & 2. 



Supplementary. — Carapace slightly convex dorsall}^ ; quadrate in 

 general outline and also in transverse section. The height of the 

 carapace is equal to half its width. The granules upon the surface 

 are irregular both in size and disposition. Rostrum broadly promi- 

 nent. Orbito-frontal region half as wide as the carapace. Epi- 



1 Denkschr. k. Akad. Wissensch. Wien, vol. xhi (1883) p. 306 & pi. i, fig. 5. 



