PART I 



Family PENAEIDAE Spence Bate 



The Penaeidac ^) coUected by the Siboga Expedition ought to be considered as a most 

 valuable contribution to our knowledge of these interesting animals and to the Fauna of the 

 East Indian Archipelago. No less than 54 species and 2 varieties have been collected and of 

 the species 19 or 20 proved to be nevv to science. Of the 34 or 35 already known species 

 only 13 or 14 have been observed formerly in this Archipelago. 



The deep-sea investigations especially have been of great importance. A rather large 

 number of species, viz. about 24, have been captured in the great depths and abysses of the 

 sea, but of these species only 3 were already known to occur in the Archipelago, viz. Aristeus 

 semidentatus (Sp. Bate), Haliporus nephmus Sp. Bate and Haliportis Lucasii (Sp. Bate), species 

 collected formerly by the "Challenger". The genus Benthesicymus Sp. Bate is only represented 

 by one species, but of the remarkable genus Gennadas Sp. Bate two species were obtained, 

 both new to science; no species of Gennadas were hitherto known from the Archipelago, 

 except Genn. Botivieri Kemp, described only in 1909, a form observed West of Manila at 

 2100 fathoms and North of New Guinea at iioo fathoms. Of the new Hemipe7iaeus Sibogae a 

 fine full-grown female was collected at a depth of 1000 meter. Very remarkable is the discovery 

 of the new Haliporus Sibogae^. a species living at depths between 400 and 521 meters, and 

 of which at four .Stations more than 50 well preserved specimens, mostly adult, were captured: 

 this interesting species belongs to the largest representatives of this genus, the male attaining 

 a length of 165 mm., while the female becomes 175 mm. long. Halip. Sibogae appertains to 

 a Section, that hitherto was still unknown in the Indopacific. 



i) The elaboration of the extensive CoUections of Decapoda obtained by the "Siboga" «ill .still take up a long tirae before its 

 completion. With Professor Max Weber's permission, the author has therefore determined on publishing already now the present manuscript, 

 in which the Families of the Penaeidae and Alphcidac have been worked out. Soon afterwards some Families of Rcptantia will follow. 

 [The figures illustrating the described species will be published later on. The species of which figures will be given are marked with tl- 

 Diagnoses of the new Species of both Families have already been published in the "Notes from the Leyden Museum, Vol. XXIX, 

 1907, p. 130—147 and Vol. XXX, 1908, p. 98—112, as also in the: Tijdschrift Nederl. Dierk. Vereeniging, (2) Dl. XI, p. 99—125, 1909 

 and p. 287 — 319. 1910. 



I 

 SIBOGA EXPEDITIE XXXIX a. I 



548Ü1 





