of the ^^ Genus " Peiieiis. ol9 



22. Metapeneus mogieiisis, Ratlibun, /. c. (As stridulans and akayebi 



as regards exopodites.) — Japan. Two of Spence Bate's specimens 

 of " M. velutinus " presented to the Indian Museum are this 

 species. 



23. Metapeneus Dalei, Rathbun, t. c. p. 40. {M. akayebigron]).) — Japan. 



24. Metapeneus acclivis, Rathbun, t, c. p. 41. [M. akayebi group.) — 



Japan. 



25. Metapeneus consobrinus, Nobili, Bull. Mus. d'llist. Nat. Paris, 1904, 



p. 229. (M. ahayeM group.) — Djibouti. 



26. Metapeneus Vaillanti, Nobili, I. e. [M. akayebi group.)— Red Sea ; 



Suez. 



27. Metapeneus jyerlamm., Vaillant, Bull. Mus. d'Hist. Nat. Paris, 190-5, 



p. 158. {M. akayebi group.) — Persian Gulf. 



28. Metapeneus lamellatus, De liaan, Faun. Japon., Crust, p. 193, pi. xlvi. 



figs. 4, 5. (Probably M. akayebi groa-p.) — Japan. 



29. Metapeneus Batei, Miers,Zool. H.M.S. ' Alert,' p. 296, pi. xxii. fig. D. 



(Probably M. akayebi grovvp.) — Australia. 



The following species may possibly come into the M. akayebi alliance: — 



30. ? Metapeneus velutinus, D&n^, v. '^. Expl. Exp., Crust, pt. i. p. 604, 



pi. xl. fig. 4. — Sandwich Islands. 



31 . ? Metapeneus palmensis, Ilaswell, P. L. S. N. S. Wales, 1879, p. 43, 



and Cat. Austral. Crust, p. 204. — Australian Seas. 



32. ? Metapeneus pubescens, Stimpson, Ann. Lye. Nat. Hist. New York, 



X. 1874, p. 133.— St. Thomas, W.. Indies. 



33. ? Metapeneus Goodei, S. I. Smith, Proc. U.S. Nat. Mus. viii. 1885, 



p. 176. — Bermuda ; Bay of Panama. 



4. Parapeneus, S, I. Smith (sensu restricto). 

 Parapeneus, S. I. Smith, Proc. U.S. Nat. Mus. viii. 1885, p. 170. 



Type, P. membranaceus, Eisso ( = P. longirostris, Lucas) . 



Rostrum toothed dorsally only. Antero-inferior angles of 

 carapace usually with, sometimes without, a branchiostegal 

 spine. Postantennular sulcus defined only ventrally, by the 

 postantennular (antennal) spine. 



A longitudinal suture is generally present on either side, 

 extending from the orbital to the posterior border of the 

 carapace, and also a vertical suture extending across the 

 branchiostegite at the level of the second pair of chelipeds. 



Antennular flagella of moderate length. Endopodite of 

 maxillules (first raaxillse) abbreviated, unsegmented, the 

 small terminal segment which is present in Metapeneus not 

 being differentiated. No exopodites on amj of the thoracic 

 legs. 



Epipodites absent from the third maxillipeds, as well as 

 from the last two thoracic appendages. No pleurobranch on 

 the last thoracic somite. 



Andricum symmetrical. 



