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° B. and the parallels of 5° and 24° N 

 during the years 1885-1900. 



They number 117 species, namely: — 



Peneidea 



Garidea 



Stenopidea 



Astacidea 



Thalassinidea 



27 species. 

 58 „ 



3 „ 

 20 „ 



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 :— 



Aristmus (Eemipeneus) carpenteri ... ... 16 4 4 fathoms 



Aristseus (Aristseopsis) armatus ... ... 1743 



Sergestes rubroguttatus ... 1748-1997 



Hoplophorus gracilirostris ... 1400 



Acanthephyra sanguinea ... 174.9 



Acanthephyra microphthalmia ... 2743 



Dorodotes reflexus ... ... 1 300-1 fiJ.4. 



Pontophilus abyssi ... ... 1 748-1 <-)Q7 



Glyphocrangon csecescens ... 1748 



Pentacheles carpenteri ... 1 370-1 ";4.n 



Willemoesia indica, ... ... 1310-1S03 



Of these, however, there can be no doubt whatever that Aristseus carpenteri 

 Sergestes rubroguttatus, Hoplophorus gracilirostris, and Acanthephyra sanguinea, 

 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 Hoplophorus 

 gracilirostris, that species is often brought on board alive. 

 1 



