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the posterior margin. About as in Pen. mogiensis one observes a pair of obtuse sternal teeth 

 between the legs of the i"^^ pair. 



The carina on the 3''^ abdominal tergum is narrow and deeply grooved, while 

 that of the 2"'^ is short, flattened, not grooved and reaching neither to the posterior nor to 

 the anterior margin. 



The external maxillipeds reach to the end of the antennal scalcs. The thoracic legs 

 seem to agree with Alcock's fig. 14 (1. c.) and are all provided with an exopod. 



The larger female from Stat. 2 has nearly the same size, viz. 84 mm., and fully agrees 

 with the female from Stat. 320, except in the following. The rostrum bears 8 teeth besides 

 the epigastric tooth. The sinuous groove between the hepatic spine and the posterior edge of 

 the carapace is q u i t e i n d i s t i n c t. Whereas the anterior plate of the thelycum has the same 

 form as in the preceding female, the lateral walls of the transverse bar, though still long, are 

 slightly di verging, and are no more exactly parallel; the transverse bar that unites them 

 posteriorly, is not divided and emarginate as in the female from Stat. 320, the posterior 

 transverse lamina, finally, is rather indistinctly divided into three lobes. In the male from Stat. 2, 

 which is also adult and 92 mm. long, the rostrum shows the same toothing as the larger 

 female and the sinuous groove between the hepatic spine and the posterior margin of the 

 branchiostegite is wanting at all. The stridulating organ of the male consists of 1 1 ridges, 

 that of the larger female of 12. In both the male and the larger female the legs of the 5"^ 

 pair reach just beyond the eyes. 



The somewhat younger female from Stat. 19 agrees with the larger female from Stat. 2, 

 but the posterior transverse lamina of the thelycum is distinctly divided 'into three lobes ; both 

 in the female and in the male the rostrum is i + 7-toothed, and the groove between the 

 hepatic spine and the posterior border of the branchiostegite is indistinct or wanting. 



The specimens from Stat. 33 are of medium size or young and agree with those from 

 Stat. 19, there is no tracé of the sinuous groove between the hepatic spine and the hinder 

 edge of the carapace. 



In the largest female from Stat. 64, that is 70 mm. long, the lateral walls of the 

 transverse bar in the middle of the thelycum are parallel as in the female from Stat. 320, but 

 the transverse piece that unites them posteriorly, is entire as in the larger female from Stat. 2 ; 

 the anterior margin of the anterior plate, between the legs of the 4"^ pair, is not concave, 

 but slightly prominent in the middle. The rostrum of a younger male from the same locality 

 is I + 9-toothed. The other younger females of this Station agree with the largest one, as 

 regards the form of the thelycum, and in all these specimens there is no tracé of the sinuous 

 groove between the hepatic spine and the posterior margin of the carapace. 



The female from the west coast of Salawatti differs from all the preceding and bears a 

 close resemblance to Pen. óaróaius {de. Wdidiu) ^= akayeói {Ka.t\\h.), as regards the shape of rostrum, 

 carapace, stridulating organ and abdomen, except the ó'"^ somite. The thelycum of this specimen 

 which is 65 mm. long, indeed fully agrees with Alcock's fig. i^d, its form is quite 

 different from that of the females that were captured in the preceding 

 Stations. The sternal teeth between the pereiopods of the 3''^ pair are separated by a much 



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