510 Dr. A. Alcock— x4 Jievision 



absence of cxopodites^ the disposition of epipodites and 

 branchite^ the form of the endopodite of the maxillule, and 

 the armature of the telson ; and these particulars are often 

 not to be found in descriptions. 



Fortunately, however, I have not been entirely dependent 

 on descriptions and figures, for when I was in England in 

 1897 I was allowed, through the kindness of Professor 

 Jeffrey Eell, to examine at my leisure the collection of Penei 

 in the British Museum, which includes the 'Challenger' 

 material determined by Spence Bate, the various species 

 described and identified by Miers, and Henderson's Madras 

 specimens described in the ' Transactions of the Linnean 

 Society' for 1893: all these I went through and tabulated, 

 specimen by specimen, with an eye to a revision of the 

 genus. Moreover, in the Indian Museum I have had at my 

 disposal (1) a collection made about thirty years ago in the 

 Andamans by that discriminating carcinologist James Wood- 

 Mason; (2) miscellaneous donations and jmrchases from 

 India, China, and Japan ; and, chief of all, (3) the many 

 hundreds of specimens trawled and dredged by the ' Investi- 

 gator ' off all the coasts and islands of British India, from 

 the Indus Delta to Mergui, during twenty-four years. A 

 very considerable part of the Indian Museum material had 

 been sorted and named by Wood-Mason before his death in 

 1893, and I must add that I have incorporated Wood- 

 Mason's rough memoranda and used his MS. names (except 

 where they have been anticipated) in this paper. 



I must also add that the contents of this paper refer 

 exclusively to the maniple Peneus. 



Sulenocera, Parasolenocera, Peneopsis, Phi/onicus, HaUporuft, 

 and. Artemisia are excluded, as they all have two arthro- 

 branchise on the penultimate thoracic leg, and the first five 

 have the cervical groove deeply impressed on the tergura of 

 the carapace. 



Funchtdia is excluded for the present, as it has long, 

 sickle-shaped, cross-cutting mandibles, 



II. Definition of the Maniple Peneus. 



Peneus, I'abr. 



Pendens Fabricius, Eutomol. Syst. Suppl. 179S, p. 408 ; Latreille, Hist. 

 Nat. Crust, vi. 180.3, p. 24(3; Leach, Traus. Linn. Soc. xi. 1815, 

 pp. 33(3, 347, and Malacost. Podoplith. Brit., text of pi. xlii. ; Des- 

 marest, Consid. Gen. Crust. 1825, p. 224; Milue^ Edwards, Hist. Nat. 

 Crust, ii. 1837, p 411 ; ])e Haan, Faun. Japon., Crust. 1849, p. 188; 

 Dana, U.S. Expl. Exp., Crust, pt. i. 1852, p. 601 ; Bell, Brit. Stalk- 



