MONOGRAPH OF THE LEUCOSIAD^. 303 



Genus Ebalia, Leach. 



Char. Gen. — Testa rhomboidalis vel subhexagona; fronte producto, emarginato. Orbita supra, fissuris 

 duabus. Fossa antennarice tectae, obliquae. Pcdipalpi externi ad marginem epistomatis extendentes, 

 caule exteriore margine externo recto, interiore acuminato. Pedes antici breves, crassi ; posteriores 

 sensim breviores, ungue forti, styliformi terminati. Abdomen Maris segmentis plurimis, — Fcemin^e 

 a tertio ad sextum confluentibus. 



Of this genus the three species most commonly known are natives of the coast of 

 Great Britain. The only other form to which it closely approximates is Lithadia. It 

 was established by Leach, and is a perfectly natural and distinct genus. Dr. Milne- 

 Edwards's opinion that our three forms are merely varieties cannot be admitted. The 

 distinctions are tangible and constant. 



Ebalia Pennantii, Leach. Testa granulate, eminentia longitudinali et transversali 

 cruciformi; margine latero-anteriore bilobato; abdomine maris segmentis a tertio 

 ad sextum confluentibus. 



Cancer tuberosus, Penn. Brit. Zool. iv. t. 9 a. f. 19. 



Ebalia Pennantii, Leach, Malac. Brit. t. 25. f. 1-6. Edw. Hist. Nat. des Crust, ii. p. 129. Bell, Brit. 



Crust, p. 141. 

 Hab. ad oras Britannise. Muss. Brit., Bell. 



The largest species of the genus. 



Ebalia Bryeri, Leach. Testa minute granulate ; margine laterali integro, subrevoluto, 

 posteriore bilobato ; regione cardiac^ bituberculat&, branchiali utrinque unitubercu- 

 lata ; brachio haud bis longiore quam latiore. Abdomen maris segmentis a tertio ad 

 quintum, — fceminse a tertio ad quartum coalitis. 



Cancer tumefactus, Mont. Trans. Linn. Soc. ix. p. 86. t. 2. f. 3. 



Ebalia Bryerii, Leach, Malac. Brit. t. 25. figg. 12, 13. Edw. I. c. p. 129. Bell, Brit. Crust, p. 145. 



Hab. ad oras Britanniae australes. Muss. Brit., Bell. 



Ebalia Cranchii, Leach. Test& granulate, carinata, tuberculis quinque ; margine latero- 

 anteriore fere integro ; brachio ter longiore quam latiore. 



Ebalia Cranchii, Leach, Malac. Brit. t. 25. f. 7-11. Edw. I. c. p. 129. Bell, Brit. Crust, p. 148. 

 Hab. ad oras Britannise rarissime. Muss. Brit., Bell. 



Ebalia granulosa, Edw. (Tab. XXXIII. fig. 5). Test& granulata, tuberculis sex; 

 margine latero-anteriore bilobo. 



Ebalia granulosa, Edw. 1. c. p. 130. 

 Hab. ad insulam Corcyram. Mus. Brit. 



Two specimens of this rare and very distinct species are in the British Museum ; they 

 were brought from the Island of Corfu. 



Genus Phlyxia, Bell. 

 Char. Gen. — Testa rhomboidea, tuberculis tribus postice instructa. Orbita supra emarginata, fissuris 

 duabus. Fossa antennariee cum orbitis communicantes. Antennulce elongata?. Pedipalpi externi caule 



