292 MR. BELL, HOR^ CARCINOLOGIC^ ; 



Ilia Nucleus, Auct. Testa minute conferte granulosa, granulis majoribus distantibus 

 instructa. 



Cancer Nucleus, Linn, Syst. Nat. 1042. 20. Herbst, i. p. 8?. t. 2. f. 14. 



Leucosia Nucleus, Fabr. Suppl. p. 351. Latr. Hist. Nat. Crust, vi. p. 116. 



Ilia Nucleus, Leach, Zool. Misc. iii. p. 24. Roux, Crust, de la Mediterr. t. 8. f. 1-8. Edw. Reg. Anim. 



de Cuv., Crust, t. 25. f. 2 ; Hist. Nat. Crust, ii. p. 124. 

 Hab. ad oras maris Mediterranei. 



Illa. bugulosa, Roux. Testa glabra, sparsim granulosa, antice Isevi. 



Ilia rugulosa, Roux, /. c. t. 8. f. 9-12. Edw. I. c. p. 125. 

 Hab. cum prEecedente. 



I refer to tbe admirable figures by Eoux, in his ' Histoire des Crustaces de la M^diter- 

 ranee,' for a clear exposition of the characters of these two species, the only ones of the 

 genus yet kno^Ti. I cannot believe that Ilia 'punctata of Edwards belongs to this genus 

 at all. The figm-e in Herbst of Cancer pimctatus, on which he has partly founded it, is 

 undoubtedly that of a species oillyra, as is showoi even by the form of the pedipalps, and 

 it may possibly be that of M. carinata of this memoii*. The species provisionally named 

 Ilia Mariannce by Herklotz, and figiu'ed by him from a specimen in the Louvain Museum, 

 is ob'viously not an Ilia. The foot-jaws and abdomen it appears were wanting in the spe- 

 cimen, so that it would be difficult to state what may be its generic relation ; but it has 

 the appearance of Myra, or still more of Myrodes ; or it may possibly offer a new generic 

 type, as suggested by the author above-named. 



Genus Peksephona, Leach. 



Char. Gen. — Testa ovalis vel orbicularis, depressa, dentibus tribus ad partem posteriorem annata, regio- 

 nibus pterygostomianis angulatis. Orhita trifissa. Fossce antennarice transversse. Pedipalpi exieriii 

 caule exteriore paulo dilatato, sensim angustiore, ad apieem interne truncato. Pedes antici robusti, 

 testa baud bis longiores ; reliqui articulis ultimo et penultimo compressis. Abdomen Maris seg- 

 mentis a tertio ad quintum, — F(Emin.e a quarto ad sextum coalitis. 



The characters of this genus and those of the species named by Leach were so im- 

 perfectly given by him, in the ' Zoological Miscellany,' that Milne-Edwards, not having 

 access to the specimens themselves from which they were derived, was fain to content 

 himself with simply translating them, being wholly unaware that they referred to a 

 previously well-known species, and in fact he gave to that species the generic name of 

 Guaia. I have, I beHeve, been able successfully to unravel this complication by an 

 examination of the numerous specunens in the British Museum, to which Leach's names 

 were attached. 



Persephona Guaia, Bell. Testa ovata, sparsim tuberculata, angulo pterygostomiano 



obtusissimo, spina media postica lateralibus paulo altiore. 

 Cancer punctatus, Browne, Hist. Jamaica, i. t. 42. f. 3. 

 Cancrejo tortuga, Parra, Descrip. &c. t. 51. f. 2. 

 Cancer Mediterraneus, Herbst, ii. t. 37. f. 2. 

 Persephona Latreillii, Leach, Zool. Misc. iii. p. 22. Desmar. Cons, sur les Crust, p. 168. 



