igiy.] S. Kemp : Notes on Crustacea Decapoda. 231 



independently from some such form as P. mirahilis ; on the con- 

 trary, it seems to grade evenly into the more normal species of 

 Leander through such forms as L. concinnus. 



Following the classification at present in vogue, I have des- 

 cribed the species as a member of the genus Palaemon ^ though, as 

 already pointed out, it then becomes extremely difficult to explain 

 how the different forms have evolved. The facts of the case, in 

 my opinion, almost compel one to regard P. mirahilis as a true 

 Leander and lead to the conclusion that, whereas the hepatic tooth 

 in Palaemon hildehrandti has sometimes become suppressed, it has 

 actually reappeared in a specialized member of the related genus. 

 My only excuse for not at once referring the species to the genus 

 Leander is that I believe it unwise to alter accepted classification 

 on theory alone, unless such theory be extremely well founded. 

 At present, unfortunately, our knowledge of the classification and 

 affinities of the genera of Palaemonidae is very incomplete; it may 

 well be that further investigation will throw light on the position 

 of the species here described. 



The specimens in the Indian Museum are from the following 

 localities : — , 



^~,^— Pazudaung and Dala Creeks, Ran- 

 goon ... ... ... N. Annandale. Sixty-five. 



"10^ Moiilmein R., Burma ... 'Investigator,' Nineteen. 



^" Off Covvcolly Lighthouse, HughliR. J. Munro. Six. 



9.6A5 Trebeni, HughU dist. ... B. L. Chaudhuri. Many 



young. 



^Y^-" Sandheads, Gangetic delta ... J. Wood- Mason. One. 



iZAi R. Hughli, Sibpur, Calcutta ... S. Kemp. Many. 



'±ll± Matlah R., Port Canning, Gangetic 



delta ... ... ... S. Kemp. Several. 



■»«;?" Hughli Nullah, Bosondherabad, 



Gangetic delta ... ... J.T.Jenkins. One. 



^^±1 Mouth of Damodar R., Gangetic 



delta ... ... ... r. Southwell. Three. 



Syl^ Near Shela, Khulna dist., Gan- 

 getic delta ... ... J. 'r. Jenkins. Four. 



~^ Creek nr. Barisal, Backergunge 



dist. ... ... ... T. Southwell. One. 



In all these localities the water is brackish, either permanently 

 or at certain states of the tide. The type specimens are from 

 Rangoon and bear the number 9633/10 in the register of the Zoo- 

 logical Survey. 



