of the carapace. There is also a rather deep post-antennular groove, that runs into the cervical 

 groove near the hepatic spine and a short post-ocular groove, that begins just below the i^' 

 tooth of the rostrum, curving backward. 



Abdomen twice as long as the carapace, rostrum included. First, second and third 

 tergum smooth and rounded; one observes, however, on the i*^' tergum of the male from 

 the Kei-islands a transverse, shallow, setae-grown groove, just behind the middle, parallel with 

 the posterior, margin, narrowing laterally but not continued on to the pleura; in the other 

 specimens it is less conspicuous. The 4"^ tergum is obtusely carinated, the carina defined on 

 either side b)- a setae-grown shallow groove and bifurcate at the posterior end; in the specimens 

 from the Kei-islands and in the larger female from Ternate the anterior third part of the 

 tergum is still rounded, but in the younger female from Ternate the subdorsal grooves hardly 

 reach beyond the middle, so that the two anterior fifths are rounded, and in the younger 

 individuals the crest is still more reduced, appearing only posteriorly. Fifth and si.xlh terga 

 sharply carinated, the former bifurcate at the posterior extremity, the latter terminating in a 

 small acute tooth; measured along the upper edge the 6^^ somite appears a little more than 

 one and a half as long as the $^^ and nearly one-third longer than the greatest width. In the 

 male from the Kei-islands (Fig. 3/^) and in the larger female from Ternate, indeed, the 5"' somite is 

 6 mm. long, the 6"^ 10,5 mm. long and 7,75 mm. broad. Telson in the female a Jittle longer 

 than the 6"> somite, in the male hardly so; it is grooved in the middle line, the groove being 

 narrow and extending to the 2°^^ lateral, spinule, and on each side two other grooves are found. 

 In the typical Penaeopsis intermedia the three lateral spinules of the telson are long and nearly 

 of the same size, while the posterior almost reaches to the tip ; in the Indian specimens (Fig. 3^) 

 the posterior spine extends only to the middle of the distance between the place of insertion 

 and the tip, the 2'"^ is slightly shorter, but the anterior or i^' spine i.s the smallest of all, 

 measuring onl}- half the length of the posterior. 



Antennular peduncle a trifle shorter than the antennal scale, reaching as far forward 

 as the antero-lateral spinule of the latter; flagella subequal, the longer upper one almost half 

 as long as the peduncle, measured from the orbital margin. External maxillipeds reaching to 

 the far end of the antennal peduncle and as long as the peraeopods of the i^' pair; spine of 

 the ischium a litde shorter than that of the preceding joint. The peraeopods of the 2°'* pair 

 reach in the male from the Kei-islands to the middle of the 2°'^ antennular article, while those 

 of the 3"' reach with the fingers beyond the antennal scale ; in the larger female from Ternate 

 they are a trifle shorter; spine at the base of 3'^'^ pair half as long as that at the base of 2^^. 

 The legs of the 4"^ pair reach in the male almost to the far end of the antennal peduncle, 

 those of the 5''^ to the middle of 2"' antennular article, the 5"' without exopodite. 



The petasma (Fig. 3^) is symmetrical and ends at either side in an acuminate 

 spout, while one observes two rounded lobes between the spouts. Figure },d 

 represents the thelj-cum. 



The specimens, taken near Port Blair in the Andamans, that were referred by Prof. Alcock 

 with doubt to Penaeopsis ensis (de Haan), probably did belong to this new variety of Penaeopsis 

 intermedia. 



