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Pen. Joyneri (Miers) of the first Section of this g-enus and Pen. acclivis (Rathb.), 

 barbahis (de Haan) = akayebl (Rathb.), Dalci (Rathb.), ensis (de Haan), intermeditcs (Kish.) 

 and lamellatiis (de Haan), which belong to the second, are species inhabiting the seas of Japan 

 and not yet recorded from elsewhere except Pen. acclivis and Pen. Dalei^ which, according 

 to Pearson, should also occur in the Gulf of Manar and at Trincomalee. Pen. Batei (Miers) 

 is still only known from Albany Island near Cape York, it must probably be added to 

 the Fauna of the East Indian Archipelago. Pen. Mastersii (Hasw.), Macleayi (Hasw.) and 

 Pabnensis (Hasw.) are inhabitants of the east coast of Australia and Peii. villosus (Guerin) 

 is also from New Holland. With certainty Pen. velutinus (Dana) is still only known from the 

 Hawaiian Islands and Pen. connuensalis (Borr.) from the island of Rotuma; Pen. Kishinouyei 

 (Rathb.), finally, inhabits the sea off the Galapagos Islands and ought perhaps to be included 

 in the american Fauna. 



The great majority of the species of this genus are sublittoral and inhabitants of rather 

 shallow water, a few, however, are recorded from greater depths. So e. g. Pen. Sidogae, captured 

 by the "Siboga" at a depth of 247 m. and 274 m., Pen. philippinensis from depths of 82, 

 100, 140 and 150 fathoms and Pen. Challengeri, collected by the "Challenger" at depths of 

 315 and 1400 fathoms and a specimen of which was taken by the "Siboga" in water of 304 m. 

 Penaeopsis serrahis A. M.-Edw., finally, was found in water of 148 and 288 fathoms in the 

 Caribbean Sea and the Gulf of Mexico, and between 120 and 640 m. by the "Talisman". 



Section I. No marginal subterminal articulating spines on the telson. Last pair of thoracic legs 

 without exopod ; their merus, in the adult male, with a notch and spine or tooth at its 

 proximal end. 



f 18. Penaeopsis 7)ionoceros (Fabr.). 



Metapeueus monoccros (Fabricius), A. Alcock, Catal. Indian Decapod Crustacea, Pt. Ill, Fasc. I. 



The Prawns of the Peneus group, Calcutta, 1906, p. 18, PL III, Fig. 7, 7«— c (ubi synon.). 

 Penaeus incisipes K. Kishinouye, Journ. Fish. Bureau, Tokyo, Vol. VIII, N" i, 1900, p. i8, 



PI. IV, Fig. 2 and PI. VII, Fig. 6. 



Stat. 2. March 8. 7°25S., 113° 16' E. Madura-strait. 56 m. Grey mud with some radiolariae. 



I adult female. 

 Stat. 47. April 8/12. Bay of Bima; near south fort. 55 m. Mud with patches of fine coral 



sand. I female of medium size and 6 still younger males, in 3 of which, however, 



the petasma is already developed. 

 Stat. 71. May 10— June 7. Makassar and surroundings. Depth up to 32 m. Mud. Sand with 



mud. Coral, i male and 4 females of medium size and 3 very young specimens. 

 Stat. 311. February 12/13. Sapeh-bay, East coast of Sumbawa. Depth up to 36 m. Mud and 



sand. I female of medium size. 

 Stat. 318. February 22. 6° 36'.5 S., ii4°55'.5E. Java Sea. 88 m. Fine, yellowish grey mud. 



I young male. 



These specimens certainly belong to that species which has been described by Kishinouye 

 as Pen. incisipes and very probably also to the species described by Alcock as Me tap. 

 monoceros, though I must observe that the petasma in the three specimens, in which it is 



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