14. 



The rostral crest is not so high as that of indicus var, merguiensis, but is 

 higher than that of typical indicus, and this intermediate form of rostrum also 

 characterizes females taken in company with males of penicillatus. 



This form grows to a length of six inches. 



There are 28 specimens in the collection, registered as follows: 



9277 



-g- Mergui. j 



3933-43 I " Investigator." 



g Orissa Coast. ' 



3044 

 7 Karachi. Karachi Museum. 



4366 4365 

 9 • ~Q~ Hooghly Delta. ^ 



4394 4671-81 \ Purchased. 



9 • 9 Bombay. -' 



The striking characters of merguiensis and penicillatus are shown in the ex- 

 ternal maxiUipeds of the male — appendages which in certain species of Aris- 

 taeus, Eemipeneus, and Benthesicj/vius also exhibit secondary sexual differences. 

 But the fact that, in the forms now under consideration, the differences in the 

 male external maxUlipeds are correlated with a decided difference in the shape 

 of the rostrum, which is also shared by the females taken in the same company, 

 precludes us, for the present, from regarding merguiensis and penicillatus as 

 allomorphic males of P. indicus, or as anything but incipient species. 



4. Peneus CANALiouLATDS, Oliv. Plate II., fig, 6a.-c. = <».fft«'« cv<s- &^&^ 



Penieus canaliculatus, Olivier, Enoyclopedie Mefchodiqne VIII. p. 660, 1811: Milne Edwards, Hist. Nat. 

 Crnst,, II. 1837, p. 414: ?? DeHaan, Faun. Japon. Crust., p. 190, 1849 : Stimpson, Proo. Acad. Philad, 1860, p. 

 44 : Heller, Novara Crust., 1865, p. 121 : Hilgendorf in v. d. Decken's Eeisen Ost-Afr. III. i. 1869, p. 102, and 

 MB. Ak. Berl. 1878, p. 843: Miers, P.Z.S. 1878, p. 298: Haswell, P.L.S., N.S. Wales, 1879, p. 38, and Cat. 

 Anatral. Crust. 1882, p. 198 : ? Spence Bate Ann. Mag, Nat. Hist. (5) VIII. 1881, p. 174, and Challenger Macrura, 

 1888, p. 243, pi. xxxii. fig. 1, 2 : Ozorio, Journ. Sci. Math. Phys. Nat. Lisb. XI. 1885-87, p. 230 : de Man, Notes 

 Leyden Mus. II. 1880, p. 185 and Archiv f. Ntiturges. LIII. i. p, 564, 1887-88, and in Weber's Zool. Ergebn, 

 Niederl. Ost-Ind. II. 1892, p. 510: Ortmann, Zool. Jalirb., Syet, V. 1890, p. 448, pi. xxxvi, fig. 2a, h: Henderson, 

 Trans. Linn. Soo. (2) V. 1893, p. 450 : Stead, Zoologist, 1898, p, 209 : Nobili, Ann. Mus. Genov. 1899, p. 232, and 

 1900, p. 474, and Boll. Mus. Torino, 1901, No. 397, p. 1 ; Borradaile in Stomap. and Macr. of Willey's Exp., 1899, 

 pp. 395, 398, 404: Kisliinouye, Journ. Fish. Bur. Tokyo, VIII. i. 1900, pp. 6, 11, pi. i, pi. vii. fig. 1,1a: Whitelegge, 

 Mem. Austral. Mus. IV. pt. 2, 1900, p. 197: Rathbun, P.U.S. Nat. Mus., 1900, p. 311 : ? Lanohester, P.Z.S. 1901, 

 II. 671, pi. xxxiv. fig. 5 : Doflein, Abh. bayer. Ak. Munchen, 1902, p. 630. 



Penssus canaliculatus var. japonicus, Spence Bate, Challenger Macrura, p. 245 pi. xxxi, xxxii. fig. 4, xxxvii. 

 fig. 2, 1888. 



Pemsus canaliculatus var, australiensis, Spence Bate, op. cit. p. 248, pi. xxxii. fig. 3 : de Man, Abh. Senokenb 

 Nat. Ges., 1902, p. 905. 



Penxus marginatus, Randall, Jonrn. Acad. Nat. Sci. Pliilad. 1839, p. 146. 



Penseus plehejus, noBS, Aich. {. Naturges. xxxi. i. 1865, pp. 168, 172, pi. vii. fig. 19: deMan, Zool. Jahrb., 

 Syst., II. 1887, p. 714. 



