I9 X 5-] Fauna of the Chilka Lake : Crustacea Decapoda. 323 



further material from Indian waters has, however, convinced me that the characters 

 on which I relied for the separation of the two forms are inconstant. 1 L. typus, auct. 

 is therefore, as Ortmann pointed out in 1893 \ synonymous with Dana's L. reynaudi 

 and, in view of the uncertainty that exists regarding the correct application of the 

 former name, the species should, in my opinion, be known as L. reynaudi (Milne- 

 Edwards) Dana. 3 



Three species of Lucifer are to be found in the Bay of Bengal. Specimens in the 

 Indian Museum, collected for the most part by the R.I. M.S. ' Investigator,' are from 

 the following localities : — 



Lucifer acestra, Dana ( = L. reynaudi, Bate 4 and Ortmann 6 ). 



Lat. io°i5' N.. long. 90°i5' E. ; about 1800 fms. Mid-water net, 375 fms. to surface. 



Lat. 9°8' N., long. 87°25' E. ; töbö fms - Mid- water net, 475 fms. to surface. 

 Lucifer reynaudi (Milne-Edwards) Dana { = L. typus, Bate 6 and Ortmann 6 ). 



Lat. io°48' N., long. 75°, 1' E. ; 500 fms. Surface net. 



Lat. I2°40' N., long. g8°26' 30" E- ; 10 fms. Surface net. 



Lat n°57'3o" N., long. 98 ia/ E. ; 7 fms. Surface net. 



Mergui Archipelago. 



Off Ceylon coast. 

 Lucifer hanseni, Nobili. 



Lat. io°48' N., long. 75 1' E. ; 500 fms. Surface net. 



Lat. I2°55'i5" N., long. 98°27' E.; 12 fms. Surface net. 



Lat. i2°4o' N., long. 98°26'3o" E. ; 10 fms. Surface net. 



Lat. n°57'3o" N., long. 98°ig' E. ; 7 fms. Surface net. 



Lat. n°58'20' N., long. 98°i8'i5" E.; 8 fms. Surface net. 



Mergui Archipelago. 



E. of Diamond I., mouth of Bassein R., Burma. 



L. reynaudi and L. hanseni were frequently found in the same haul. 



The only species of Lucifer obtained in the Chilka L,ake is L. hanseni, which 



1 As regards the differential characters mentioned in my previous paper (loc. cit., 1913, p. 60), I 

 6nd on further examination that the pair of fine spinules that occur in the male behind the posterior 

 tooth on the ventral margin of the last abdominal somite are sometimes present, sometimes rudimentary 

 and sometimes entirely absent. The difference observed in the proportions of the outer uropod is ap- 

 parently due to age, the segment being proportionately narrower in young individuals. 



2 Ortmann, Decap. Schizop. Plankton-Exped. , p. 40 (1893). 



3 Since this paper went to press I have received a copy of Mr. Borradaile's recent note on the 

 species of Lucifer [Ann. Mag. Nat. Hist. (8), XVI, p. 226 (1915)]. Mr. Borradaile, relying on the accu- 

 racy of figures published by a number of authors (a procedure that, in the case of the ' Challenger ' 

 Report at least, seems decidedly perilous), has introduced no less than six new species, of several of 

 which he has apparently not seen specimens. Nobili's Lucifer hanseni, doubtless owing to an oversight, 

 is omitted. I regret that in the account here given I have not dealt more fully with the individual 

 variation of L. hanseni and with the differences which exist between young and old specimens. Such 

 variation is probably considerable throughout the genus (see footnote above) and, until it has been 

 studied in detail, the multiplication of specific names by such methods as Mr. Borradaile has adopted 

 is to be deprecated. 



* Bate, Rep. 'Challenger' Macrura, p. 466, pi. lxxxiv (1888). 



5 Ortmann, loc. cit., p. 40. 6 Bate, loc. cit., p. 464, pi. lxxxiii (1888). 



