io6 



f47. Pcnacus canaliculatus Oliv. 



Pcnaeus canaliculatus A. G. Olivier, Encyclop. Méthod. iSii, p. 660. 



Penaeus canaliculatus H. Milne-Edwards, Hist. Nat. Crust. II, 1837, p. 414. 



Pcnaeus canaliculatus C. Spence Bate, in: Ann. Mag. Nat. Hist. (5) Vol. 8, i88r, p. 174 and 



Report Chailenger Macrura, 1888, p. 243, PI. XXXII, Fig. i and 2. 

 Penaeus canaliculatus G. Nobili, in: Ann. Scienc. Nat. Zoölogie. 9e Sér. T. IV, 1906, p. 9. 

 Nee: Penaeus canaliculatus W. de Haan, Fauna Japon. Crust. 1849, p. 190. 

 Nec: Penaeus canaliculatus E. J. Miers, in: Proc. Zool. Soc. 1878, p. 298 and Report Voyage 



of H.M. S. "Alert", 1884, p. 563. 

 Nee: Penaeus canaliculatus K. Kishinouye, in: Journal Fisheries Bureau, Vol. VIII, N" i,Tokyo, 



1900, p. II, PI. I and PI. VII, Fig. i. 

 Nec: Penaeus canaliculatus A. Alcock, Catal. Indian Decap. Crust. Part III. Macrura. Fase. i, 



Calcutta, 1906, p. 14, PI. II, Fig. 6, 6a — c. 



Stat. 131. July 24/25. Anchorage oft" Beo, Karakelang-islands. 13 m. Mud and sand. i female. 

 Stat. 133. July 25/27. Anchorage oft" Lirung, Salibabu-island. Depth up to 36 m. Mud and 



hard sand. i male and 2 females. 

 Stat. 179. September 2/3. Kawa-bay, west coast of Ceram. Reef. i male and 4 females. 



All these specimens belong to the typical species, characterized by the telson hearing" 

 no spinules on its lateral margins. The female from Stat. 131 is 92 mm. long. The rostrum 

 that reaches to the end of the antennular peduncle is -/-dentale; four teeth are on the carapace, 

 the i^' is one and a half as far distant from the 2°"^ as the 2°'' from the 3''^; the ventral tooth 

 is situated just below the interspace between the two foremost teeth of the upper border. 

 Dorsal median groove of the carapace much narrower than the lateral ones. External maxillipeds 

 reaching to the end of the antepenultimate joint, the 3''^' legs to that of the terminal joint of 

 the antennular peduncle. The fingers of the 3"^ legs are not longer than the palm. 



The male from Stat. 133 is 88 mm. long. The rostrum that reaches to the tip of the 

 antennular peduncle, is ^-dentate and agrees with that of the preceding female. The legs of 

 the 3'"'^ pair reach to the end of the penultimate joint of the antennular peduncle. The larger 

 female of this Station is 137 mm. long, whereas the specimens of H. Milne Edwards from the 

 Mauritius measured 125 mm. Unfortunately the tip of the rostrum is broken, but it resembles^ 

 no doubt, the preceding specimens; four teeth are on the carapace and the i*' is one and a 

 half as far distant from the 2°*^ as the 2°^^ from the 3''*^. The distance (20 mm.) between the 

 tip of the posterior spine and the posterior margin of the carapace is twice as long as the 

 distance (9,5 mm.) in front of it, measured to the orbital margin. The groove of the post-rostral 

 carina is much narrower than the lateral furrows. The sixth abdominal somite is 14,5 mm. long^ 

 measured along its upper border and 12 mm. wide; the telson is 16 mm. long. 



As regards the length of the external maxillipeds and of the third legs this female agrees 

 with that from Stat. 1 3 1 ; the fingers of these legs are slightly shorter than the palm. 



The other female is 60 mm. long; rostrum 7-dentate. The thelycum shows another form 

 than in the adult ; the lateral plates or lobes are not in contact with one another, but 

 separated by an interspace as broad as the plates. The external maxillipeds and 

 the third legs are slightly shorter than in the preceding specimens. 



The male from Kawa-bay is very young, its rostrum is broken, the four females are 



io6 . 



