1922. j W. M. Tattrrsall : Indian Mysidacea. 447 



Afromysis macropsis. Neomysis hodgarli. 



Prionomysis slenolepis (gen. nov.). Idiomysis inermis (gen. nov.) 



Doxomysis anomala. Heteromysis proximo,. 



Doxomysis littoralis. Heteromysis zeylanica. 



Neomysis indica. Heteromysis gymnura. 



The total number of species of Indian Mysidacea is therefore 

 brought up to 53 species. 



Much remains to be done with the deep-water fauna of Indian 

 waters and many deep-sea species will doubtless be added to the 

 list. Extended knowledge of the distribution of the shallow-water 

 forms is desirable, and when it is remembered that the majority of 

 the species reported here were collected during two short expedi- 

 tions only, the results, if continuous observation and collection 

 were possible, are distinctly promising. 



The failure of earlier expeditions to tropical waters to obtain 

 shallow-water Mysidacea is not due, as one was almost beginning 

 to suspect, to the fact that these forms are absent from tropical 

 waters, but entirely to a lack of knowledge of how to collect them. 

 They are much smaller than the species from temperate and 

 Arctic regions and easily pass through dredges and trawls. They 

 require to be collected by means of special hand-nets made of 

 mosquito netting used vigorously among the weeds on the shores 

 below low-water mark. The results recorded below are a testimony 

 to the successful use of such means by Dr. Kemp. 



In examining this collection the most striking fact which 

 presented itself was its strong Mediterranean facies. Out of twenty 

 genera, no fewer than twelve are represented in the fauna of the 

 Mediterranean, and I have frequently had to refer to Sars' work 

 on the Mediterranean Mysidae for the nearest described form to 

 many of the new species noted here. Several of them, indeed, 

 are so closely allied to Mediterranean species that it was only ne- 

 cessary to refer to Sars' work and to tabulate the differences found 

 in the Indian species. These facts will be more clearly brought 

 out by a study of the following list in which are given the Indian 

 forms and their Mediterranean allies : — 



Indian species. Mediterranean species. 



Lophogaster intermedins. L. typicus. 



c - • a 1 • „ ( S. norvegica. 



Siriella vulgaris. ) \ c , ? . 



rr b . > < S. clausn. 



» a & ms - S Is.jaltensis. 



Anchialina typica. l . ... 



grossaj A.agtlis. 



Gastrosaccus dunckeri. ~\ 



,, muticus. (. G. sanctus. 



„ kempi. ) 



,, pacificus. > ,- 



i , ■ } G. nor mam. 



„ bengalensis. > 



Erythrops minuta. Erythrops set rata. 



,, nana. elegans. 



