MONOGRAPH OF THE LEUCOSIADvE. 303 



Genus Ebalia, Leach. 

 Char. Ges. -Testa rhomboidalis vel subhexagona ; fronte producto, emar^inato. Orbita supra fissuris 

 duabus. Fossa antennarite tecte, obliqiu-c. Pedipalpi 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^ 

 a tertio ad sextum confluentibus. 

 Of this genus the tliree 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. TestS, granulate, eminentiS, 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 Britanniae. Muss. Brit., Bell. 



The largest species of the genus. 



Ebaiia Brtebi, Leach. Testa minute granulata; margine lateraH integro, subrevoluto, 

 posteriore bilobato ; regione cardiaca bituberculata, branchiali utrinque unitubercu- 

 lata ; bracliio baud bis longiore quam latiore. Abdomen maris segmentis a tertio ad 

 quintum,— foeminae a tertio ad quartum coalitis. 



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



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



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



Ebalia Cranchii, Leach. Testa granulata, 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 Britanniae rarissime. Muss. Brit., Bell. 



Ebalia gbaktjlosa, Edw. (Tab. XXXIII. fig. 5). Testa granulata, tubercuUs sex; 



margine latero-anteriore bUobo. 



Ebalia yranulosa, Edw. /. 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. G^v.— Testa rhomboidea, tuberculis tribus postice instructa. Orbita supra emarginata, fissuris 

 duabus. Fo*««a«<ennarwe cum orbitiscommuaicantes. ^«/ett«Mte elongatae. Pedipalpi externi caxiXe 



