PART I. CRUSTACEA MACRURA. 



INTRODUCTION. 



The Macrurous Decapod Crustacea included in this Catalogue were all of 

 them dredged by the Royal Indian Marine Survey Ship " Investigator," in deep 

 water, between the meridians of 65 and 99 E. and the parallels of 5 and 24' N., 

 during the years 1885-1900. 



They number 117 species, namely: 



Peneidea ... ... ... ... 27 species. 



Caridea ... ... ... ... 58 



Stenopidea ... ... ... ... 3 



Astacidea ... ... ... ... 20 ,, 



Thalassinidea ... ... ... ... 9 



Of these 117 species, 69 are believed, for the present, to be proper to the 

 seas of India, although it is highly probable that many of them will be found to 

 have a wider range ; while 48 are already known to occur in other seas. 



Of the 48 widely-ranging species, 25 are known to inhabit the North 

 Atlantic, and 29 the Pacific, 6 species being common to the Atlantic and 

 Pacific as is shown in the tables following. 



Most of the species were dredged in less usually considerably less than 

 1000 fathoms : the only species taken from great depths are the following : 



AristKus (Hemipeneus) carpenteri ... ... 1644 fathoms. 



Aristseus (Aristseopsis) armattts ... ... ... 1748 ,, 



Sergestes rubroguttatus ... ... ... 1748-1997 



Hoplophorus gracilirostris ... ... ... 1439 



Acanthephyra sanguined ... ... ... 1748 



Acanthephyra microphthalmus ... ... ... 174S 



Dorodotes reflexus ... ... ... ... 1300-1611. 



Pontophilus abyssi ... ... ... ... 1748-1997 



Glyphocrangon csecescens ... ... ... 1748 



Pentacheles carpenteri ... ... ... 1370-1540 



Wilkmoesia indica ... ... ... ... 1310-1803 



Of these, however, there can be no doubt whatever that Aruttaeu* <//'/< /Vn, 

 Sergestes rubroguttatus, Hoplophorus gracilirostris, and Acanthephyra santjuiitfa 

 were caught in the ascent of the trawl, for the very good reason that they are 

 usually found in much shallower water, and that in the case of Hoploptu 

 gracilirostris , that species is often brought on board alive. 

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