446 Records of the Indian Museum. [Vol. XXIV, 



In 1906 I recorded Siriella pauhoni Kossmann from Ceylon 

 and between 1908 and 1914 I have described six other species of 

 M3'sidae from the brackish waters of the coast of India : — 



Rhopalophthalmus egregius Han- Potamomysis assimilis Tatter- 

 sen, sail. 



Gastrosaccus muticus Tattersall. Indomysis annandalei Tatter- 



Gastrosaccus simulans Tatter- sail. 



sail. , Mesopodopsis orientalis (Tatter- 



sall). 



In the course of his report on the Siboga Mysidacea Hansen 

 {1910) records the following species from the Bay of Bengal : — 



Siriella gracilis Dana. Gastrosaccus bengalensis Han- 



Siriella aequiremis Hansen. sen. 



Hemisirietla parva Hansen. Pseudanchialina pusilla G. O. 



Anchialina grossa Hansen. Sars. 



Pseudanchialina inermis Illig. 



Zimmer (1915 (3)) described the Mysidae collected by Dr. 

 Duncker during a voyage from Ce\lon to New Guinea. No exact 

 localities are given for the following species, which may or may not 

 have been taken in Indian waters : — 



Anchialina frontalis Zimmer. Leptomysis apiops G. O. Sars ? 



Anchialina penicillata Zimmer . Dioptromysis perspicillata Zim- 

 Gastrosaccus bengalensis Han- mer. 



sen. Uromysis armata Hansen. 



Gastrosaccus dunckeri Zimmer. Lycomysis pusilla Zimmer. 



Of these forms, Anchialina frontalis is, in my opinion, a syno- 

 nym of A. grossa Hansen, Leptomysis apiops of L. xenops, sp. nov., 

 described below, and Lycomysis pusilla of L. spinicauda Hansen. 



Finally Colosi (1920) has recorded Doxomysis zimmeri Colosi, 

 from Ceylon. 



The total number of species of Mysidacea known from Indian 

 waters is therefore 27. 



In the present report I record 38 species of which twelve have 

 been recorded previously from India, sixteen are described as new 

 to science and ten are new to the Indian fauna. These last 

 species are : — 



Lophogaster intermedius Han- Siriella dubia Hansen. 



sen. Anchialina typica (Kroyer). 



Siriella brevicaudata Paulson. Gastrosaccus pacificus Hansen. 



Siriella quadrispinosa Hansen. Erythrops minuta Hansen. 



Siriella vulgaris Hansen. Hypererythrops spinifera (Han- 

 Siriella affinis Hansen. sen.) 



The new species described below are : — 

 Siriella hanseni. Mysidopsis indica. 



Gastrosaccus kempi. Mysidopsis kempi. 



Erythrops nana Leptomysis xenops. 



