BIOIOGICAL SiATiOi ; _ ^ ,.^„,^^ 

 ST. PETERSBURG BcACH 6. FLORIDA 



PART I 

 Family PENAEIDAE Spence Bate 



The Penaeidae^) collected 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 new 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 abys.ses of the 

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

 semidentatus (Sp. Bate), Haliporus neptunus Sp. Bate and Haliporus Lucasii (Sp. Bate), species 

 collected formerly by the "Challenger". The genus Benthesicymns 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. Bcmvieri Kemp, described only in 1909, a form observed West of Manila at 

 2100 fathoms and North of New Guinea at 11 00 fathoms. Of the new Hemipe?tams Sibogae a 

 i^ne 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 lencTth of i6s 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 Collections of Decapoda obtained by the "Siboga" will still take up a long time before .ts 

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

 in which the Families of the Penaeidac and Alphcidac have been worked out. Soon afterwards some Famil.es of Rcptantm will follow. 

 [The figures illustrating the described species will be published later o.. The species of which figures will be g.ven are marked w,tht]. 



Diagnoses of the new Species of both Families have already been published in the "Notes from the I.eyden Museum, Vol. \\I\, 

 1907, p. .30-147 and Vol. XXX, 1908, p. 98-112, "^ =^1^° i° ""== Tijdschrift Nederl. Dierk. Vereeniging, (2) Dl. XI, p. 99-:25...909 

 and p. 287—319. igio- 



SIBOGA EXPEDITIE XXXlXa. 



