1917- ] S, Kemp : Notes on Crustacea Decapoda. 301 



The specimens from Yokohama described by von Martens be- 

 long, as is clearly shown by the figure, to the subspecies impro- 

 visa and this is also true of those from Tokio examined by Miers, 

 the rostrum bearing only from 7 to 14 dorsal teeth. 



From these facts it may be concluded that the subspecies is 

 found onl}' in the north-eastern parts of the main island of Japan 

 and, if this is true, the specimens recorded by Ortmann from Tokio, 

 by Doflein from Yokohama and by Balss from Koitcgawa in 

 Kadzuza province are probably to be referred to the subspecies. 

 This is no doubt also the case with the material used by Ishikawa 

 in his account of the development of the species,' 



The types are from Lake Haruna and bear the number 9679/10 

 in the register of the Zoological Survey of India. 



Paratya curvirostris (Heller). 



1862. Caridi)ia curvirostris, Heller, Ver/iaiidl. zooh-bot. Ges. IVien, XII. 



P: 525- 



1865. Caridina curvirostrzs, Heller, Voy. ' Novara,' Crust., p. 105. 

 1876. Caridina curvirostris, Miers, Cat. N. Zealand Crust., p. 78. 

 1870. Leander fluviatilis, Thomson, Trans. N.Z. Inst. XI, 1S78, p. 2j;i, 



pi. X, fig. A 2. 

 1903. Xipliocaris curvirostris, Thomson, Trans. Linn. Soc, Zool. (2), VIII, 



_p. 447, pi. xxix, figs. 2-13. 

 1906. Xipliocaris curvirostris, Chilton, Proc. Zool. .Soc. Lo>idon, p. 703. 

 1909. Xiplwcaridina fluviatilis, ^ovw'xer, Comptes lendus Acad. Sci. Paris, 



p. 1728. 

 1912. Xiplwcaridina curvirostris, Kemp, Rec. Ind. Mus., VII, p. 113. 



In this species* the rostrum reaches to or a little beyond the 

 apex of the antennal scale and is armed above with from 10 to 17 

 teeth. These teeth do not form an uninterrupted series, as in 

 all other species of Paratya^ but are separated, usually quite dis- 

 tinctly, into three groups. The hindmost group consists of 2 or 3 

 teeth, all of which are on the carapace behind the orbital notch; 

 the second group is composed of 4 to 8 teeth, situated in the basal 

 half of the rostral length; the third group is placed just behind 

 the apex and comprises 3 to 7 teeth. In most cases i or 2 solitar}^ 

 teeth are to be found between the second and third groups. On 

 the lower margin there are from 3 to 8 teeth, usually 4 to 6. The 

 teeth are larger than is customary and are rather widely separated, 

 extending on to the distal third of the rostral length. 



The lateral process of the antennular peduncle reaches to the 

 middle of the second segment. 



The carpus of the first peraeopods (text-fig. 4a) is from 1*7 to 

 2'4 times as long as broad; it is decidedly more slender in males 

 than in females. That of the second peraeopods (text-fig. 46) is 

 from 5*0 to 67 times as long as broad. The propodus of the third 

 peraeopods (text-figs. 4c, /) is from 2'5 to 3*9 times the length of 



1 Ishikawa, Quart. Journ. Microsc. Sci., XXV, p. 391 (1885). 



2 The information here given is mostly abstracted from my paper of 191 2, 

 supplemented bj- a number of fresh obser\ations. 



