292 MR. BELL, HORZ CARCINOLOGICÆ ; 
Iura NvcLEUs, Auct. Testà minutè confertà granulosä, granulis majoribus distantibus 
instructä. 
Cancer Nucleus, Linn. Syst. Nat. 1042. 20. Herbst, i. p. 87. 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. Rég. Anim. 
de Cuv., Crust. t. 25. f. 2; Hist. Nat. Crust. ii. p. 124. 
Hab. ad oras maris Mediterranei. 
Tita RUGULOSA, Roux. Testä glabrá, sparsim granulosa, antice levi. | x 
Tlia rugulosa, Roux, 1. c. t. 8. f. 9-12. Edw. l. c. p. 125. 
Hab. cum praecedente. 
I refer to the admirable figures by Roux, in his * Histoire des Crustacés de lg Méditer- 
ranée,’ for a clear exposition of the characters of these two species, the only ones of the 
genus yet known. I cannot believe that Tlia punctata of Edwards belongs to this genus: 
at all. The figure in Herbst of Cancer punctatus, on which he has partly founded it, is | 
undoubtedly that of a species of Myra, as is shown even by the form of the pedipalps, and 
it may possibly be that of M. carinata of this memoir. The species provisionally named 
Ilia Marianne by Herklotz, and figured by him from a specimen in the Louvain Museum, 
is obviously 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 PERSEPHONA, Leach. 
Cuar. GEN.— Testa ovalis vel orbicularis, depressa, dentibus tribus ad partem posteriorem armata, regio- 
nibus pterygostomianis angulatis. Orbita trifissa. Fosse antennarie transverse. Pedipalpi externi 
caule exteriore paulo dilatato, sensim angustiore, ad apicem interné truncato. Pedes antici robüsti, 
testa haud bis longiores; reliqui articulis ultimo et penultimo compressis. Abdomen Manis seg- 
mentis a tertio ad quintum,—F«wrx. 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 believe, been able successfully to unravel this complication by an 
examination of the numerous specimens in the British Museum, to which Leach’s names 
were attached. 
PERSEPHONA GUAIA, Bell. "Testà ovata, sparsim tubereulatä, angulo pterygostomiano 
obtusissimo, spinà mediá posticà lateralibus paulo altiore. 
. Cancer punctatus, Browne, Hist. Jamaica, i. t. 42, f. 3. 
Canerejo tortuga, Parra, Descrip. &c. t. 51. f. 2. 
Cancer Mediterraneus, Herbst, ii. t. 37. f. 9. 
Persephona Latreillii, Leach, Zool. Misc. iii, p. 22. Desmar. Cons. sur les Crust. p. 168. 
