species, but I wish to remark that in Pcuaeopsis akayebi (Rathb.), which, however, is identical 

 with Pen. barbatiis (de Haan), all the thoracic legs bear an exopod (de Man, in : Trans. Linn. 

 Soc. London, 1907, p. 453) and that in all the species oi Penaeopsis collected by the "Siboga", 

 fourteen in nuniber, all or all but the last pair of thoracic legs are provided with exopods, 

 excepting only Pen. Challengeri^ the new name for Spence Bate's Pen. serratus. 



f32. Parapcnacus Jissnrns (Sp. Bate). 



Penaeiis fissurus C. Spence Bate, in: Ann. Mag. Nat. Hist. (5) VIII, 1881, p. 180 and in: 



Report Challenger Macrura, 1888, p. 263, PI. XXXVI, Fig. i. 

 Penaeiis fissiirjis L. A. Borradaile, On the Stomatopoda and Macrura brought by Dr. WiLLEY 



from the South Seas, 1899, p. 395, 404. 

 Parapeneus fissurus A. Alcock, Ann. Mag. Nat. Hist. (7) XVI, 1905, p. 520 and Catal. Indian 



Decap. Crust. Part III. Macrura. Fase. i. Calcutta 1906, p. 31, Pi. V, Fig. 16, \6a, b. 



Stat. 289. January 20. 9°o'.3S., 126° 24'. 5 E. Timor Sea. 112 m. Mud, sand and shells. i young 



male and i young female. 

 Stat. 302. February 2. 10° 27'. 9 S., 123° 28.7 E. Near Rotti-island. 216 m. Sand and coral sand. 



22 males and 6 females. 

 Stat. 306. February 8. S°27'S., 122° 54'. 5 E. Lobetobi-strait. 247 m. Sandy mud. 3 males and 



10 females. 

 Stat. 312. February 14. 8° 19' S., ii7°4i'E. Saleh-bay, North coast of Sumbawa. 274 m. Fine, 



sandy mud. 4 males and 6 females. 



Both by Spence Bate (l.c. 18SS, PI. XXXVI, Fig. i) and by Alcock (1. c. 190Ó, PI. V, 

 Fig. 1 6) the rostrum of this species is figured as projecting straight forward and hardly reaching 

 beyond the i^' joint of the antennular peduncle; the specimen that was figured by Spence Bate 

 was a female, that figured by Alcock a male. It is therefore very remarkable that almost 

 in all the more than 50 specimens collected by the "Siboga", which are of different size 

 and age, the tip of the rostrum is more o r 1 e s s d i s t i n c 1 1 y t u r n e d u p w a r d nearly 

 as in Parapeneopsis seulptilis (A. xAlcock, l.c. 1906, PI. VII, Fig. 22), so that the rostrum 

 presents a distin et doublé curve. Only in the two young specimens from Stat. 2S9 the 

 male of which measures 55 mm., the female 72 mm., the rostrum appears just as long as in 

 the quoted figures. In the male specimens the rostrum usually reaches to the far end or to 

 near the far end of the 2°^^ antennular article; rarely it reaches to the middle of this article or 

 extends even but a little beyond the i^', as in an almost adult male from Stat. 312, in which 

 the rostrum bears 5 teeth besides the epigastric one. In a young male from Stat. 302, long 

 100 mm., the slender rostrum reaches to the middle of the 3"^ article, but this is a rare 

 exception; it bears 6 teeth besides the epigastric tooth, the tip is slightly turned upward and 

 twice as far distant from the foremost tooth as this tooth from the penultimate. In the female 

 the rostrum is generally longer than in the male, reaching to the middle of the 3''! article, 

 to the end of the peduncle or sometimes even slightly beyond it. According to Spence Bate 

 and Alcock the rostrum should carry 6 teeth in addition to the epigastric tooth. Precisely in 

 half the number of the 28 males in which the rostrum is not broken ofiF, there are six teeth 

 on it besides the epigastric tooth ; in 6 males five teeth were observed ; in 3 males seven and 

 in 4 males six teeth of which the foremost, however, was rudimentary. In an adult male, long 



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