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probably is not identical with the true niogiensis Rathb. (Alcock, Catal. Indian Decap. Crust., 

 Macrura, 1906, p. 29, PI. V^, Fig. 15). Sixth abdominal somite measuring three-fifths the 

 length of the carapace, without the rostrum, measured near the dorsal median line; it closely 

 resembles that of Pen. mogiensis (Rathb.) (Proc. U. S. Nat. Mus. 1902, p. 40). The 6* abdominal 

 somite is a trifle shorter than the telson, and the telson is a little shorter than the uropods. 



The external maxillipeds reach to the end of the antennal scales, and the thoracic legs 

 that are all furnished with an exopod, resemble those of Alcock's JMct. mogiensis. Ventral 

 spines between the bases of the feet of the 2'^^ pair well developed, like also the two small 

 teeth between those of the 3'''^. 



The thelycum consists of the following parts: between the legs of the s''^ pair two 

 parallel transverse plates, the anterior of which is a little less broad but somewhat longer than 

 the posterior; its anterior margin is emarginate, the outer angles are dentiform, the lateral 

 margins arcuate. The posterior is cut into three lobes, the outer of which are bluntly dentiform 

 and more prominent than that in the middle, the tip of which is mucronate. One observes 

 between the 4"' pair of legs a sunken plate a little less broad than long ; the anterior border 

 has dentiform angles and in the middle a mucronate tip. Midway between this anterior border 

 and that of the anterior of the two plates lying between the legs of the 5''^ pair one observes 

 a pair of small teeth that are smaller and of a different form than in Alcock's mogiensis^ and 

 between these teeth and the anterior of the two plates are situated a pair of acute denti- 

 form tubercles that are a little farther distant from one another than the two anterior teeth 

 which at their base are contiguous. These tubercles are wanting in the unnamed Pcnacopsis 

 that follows, and in most other species of the Akayebi-^rowf^. 



The female from Stat. 37 is much younger, its rostrum that reaches to the middle of 

 2"*^ antennular article is 8 + i-toothed. 



All the thoracic legs bear an exopod. 



f27. Penaeopsis sp. 



} Metapenaeus mogiensis A. Alcock, Catal. Indian Decap. Crust., Part III, Macrura, Fase. i, 

 Calcutta, 1906, p. 29, PI. V, Fig. 15, 15^, b. 

 Nee: Parapenaeus mogiensis M. J. Rathbun, in: Proc. U.S. Nat. Mus. Vol. XXVI, 1902, p. 39. 



Stat. 104. July 2/3. Sulu-harbour, Sulu-island. 14 m. Sand. i very young female. 



Stat. 152. August 12/13. Wunoh-bay, N.W. coast of Waigeu-island. 32 m. Lithothamnion- 



bottom. I young male. 

 Stat. 179. September 2/3. Kawa-bay, West coast of Ceram. 2 young males captured on the 



reef and another taken in the sea at a depth of 36 m. 

 Stat. 240. November 22 — December i. Banda-anchorage. From 9 — ^6 m. Black sand. Coral. 



Lithothamnion-bank in 18 — 36 m. 2 males and 7 females. 

 Stat. 258. December 12/16. Tual-anchorage, Kei-islands. 22 m. Lithothamnion, sand and coral. 



I male. 



Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 



13 m. Sand and shells. 2 young males. 

 Stat. 282. January 15/17. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.- 



point of Timor. Sand, coral and Lithothamnion. 27 — 54 m. i young male. 

 Stat. 313. February 14/16. Anchorage East of Dangar Besar, Saleh-bay. Depth up to 36 m. 



Sand, coral and mud. 4 males and 5 females. 



70 



