Stat. 209. September 23. Anchorage oft" the south point of Kabaena-island. 22 m. Coarse 



sand. I male and 2 females. 

 Stat. 240. November 22 till December i. Banda-anchorage. From 9 — 36 m. Black sand. Coral. 



Lithothamnion-bank in 18 — 36 m. 7 males and 9 females. 



A new species of the Akayedz-group, without stridulating organs. Body tomentose. One 

 of the largest specimens, the male from Stat. 109, is 45 mm. long. In its general appearance 

 this species much resembles Alcock's Pen. viogiensis (Catal. Indian Decap. Crust. Part III. 

 Macrura, 1906, PI. V, Fig. 15). The rostrum, that is directed obliquely upward, is short, 

 reaching only to the far end of i^' antennular article, hardly beyond the eyes. It is almost in all 

 the specimens armed with five rather large teeth, in addition to the somewhat smaller 

 epigastric tooth ; the five teeth are equidistant, the distance between the foremost tooth and the 

 tip is a little shorter than this tooth is itself long. Lower margin straight, ascending, while a 

 line uniting the tips of the teeth and of the rostrum usually appears slightly arcuate. Epigastric 

 tooth situated at the anterior fourth of the carapace. Supra-orbital, branchiostegal and antennal 

 spines small. The carapace of the male from Stat. 109 is 8Y3 mm. long, measured near the 

 dorsal median line and without the rostrum; 6* abdominal somite 6Y3 mm. long, three-fourths 

 the length of the carapace, and 3,75 mm. broad. The arcuate subhepatic groove is as well 

 marked as in Alcock's Pen. inogicnsis. The telson, a trifle longer than the 6* somite, is a 

 little shorter than the caudal swimmerets, that are of equal length. Sometimes, as in the female 

 from Stat. 99, which is 37 mm. long, the rostrum is straight above, not arcuate; rarely, as 

 in a female from Stat. 184, there are 6 teeth on the rostrum instead of the typical 5. 



Lower (inner) antennular flagellum as long as the two last joints of the peduncle taken 

 together, almost half as long as the peduncle. 



The external maxillipeds reach, in the male, to the apex of the antennal scales; the 

 bispinose legs of the i^' pair extend with the fingers beyond the antennal peduncles, those of 

 the 3''<^ reach with their chelae beyond the antennal scales, those of the 4"^ project to the end 

 of the antennal peduncles, while the legs of the 5'*^ pair reach with their dactyli beyond the 

 eyes. The 2°'^ legs are unispinose, those of the -^^^ pair are unarmed. AH the thoracic legs 

 bear an exopod. 



The left branch of the petasma extends beyond the right, its rounded tip is curved 

 towards the latter ; right branch less enlarged than in Pen. inogiensis. Ventral spines between 

 the bases of the feet of the 2°*^ pair well developed. 



The thelycum consists of the following parts. There is a transverse plate posteriorly, as 

 in the other species of this group, and cut into three lobes, the broader median lobe hardly 

 reaches beyond the outer ones ; one observes, between the legs of the 4''^ pair, a sunken plate 

 nearly as broad as long, that bears a small tooth in the middle of its anterior border and a 

 small rounded tubercle or prominence at each postero-external angle ; the two teeth, however, 

 that occur in Peri, mogiensis (Rathb.), in Pert, perlariiiii (Nob.) and in the two species described 

 p. 69 and 70, are wanting completely; finally between the posterior trilobate lamina and 

 the sunken plate at either side a transverse lobe occurs, that is directed obliquely outward, 

 nearly as in the Penaeopsis sp. described p. 70. The largest females are 40 mm. long. 



72 



