158 CEYLOX PEARL OYSTER REPORT. 



So little is known of tropical Mysidse, that one had hoped that the collections made 

 by Professor Herdman in ( V-vloii would have added considerably to our knowledge, 

 especially as the material of the other groups of Crustacea, more notably the 

 Amphipoda, Isopoda, and CuMACEA, has been found to be so rich in the number 

 of species, both described and new. Still, as, so far as I am aware, no Schizopoda 

 have previously been recorded from Ceylon waters, the present collection, though 

 small, provides a first contribution to our knowledge in this respect. 



To judge from the contents of the stomach of a ray, Dicerobatis ergoodoo, which 

 contained several hundred specimens of Ewphausia latifrons, the Euphausians in the 

 tropics, equally with those of more temperate climes, are economically of primary 

 importance as fish-food, an importance which can scarcely he over-estimated. 



With the Stomatopoda, Professor Herdman was distinctly more successful, ten 

 species of adult and ten types of larvee being present in the collection. Remembering 

 the difficulty which always attends the capture of adult Stomatopoda of any kind, 

 the results obtained must be regarded as highly satisfactory considering the limited 

 time at Professor Herdman's disposal. Five species are added to the fauna of Ceylon, 

 two of which, Gonodactylus herdmani and G. acanthurus, are new to science, both 

 possessing features of great interest. 



Species of adult Stomatopoda have been recorded from Ceylon by Heller (1868), 

 Miers (1881), Muller (1887), and Henderson (1890 and 1893). The full list is as 

 follows, with the names of the recorders : 



Squilla nepa [Heller, Henderson, 1890]. G. graphwrus [Muller, Miers, Henderson, 1890]. 



,S'. oratoria [Heller], G. demani [Henderson, 1893]. 



S. scorpio [Henderson, 1890]. Odontodactylus scylh/rus [Muller]. 



Lysiosquilih maculata [Henderson, 1890]. Protosquilla trispinosa [Henderson, 1893]. 



L. saracinm-um [Muller]. /'. trispinosa,, var. ptikhrlla [Henderson, 1890, 



Pseudosquilla ciliata [Muller, Henderson, 1890]. Miers]. 



Gonodactylus chiragra [Muller, Henderson, 1893]. P. stoliwa [Muller]. 



G, glabrous [Henderson, 1893]. P. ectypa [Muller]. 



Of this list, Squilla oratoria, as recorded by Heller, is regarded by Miers as 

 synonymous with S. nepa. This leaves a total of thirteen species and one variety 

 of Stomatopods already known from Ceylon. To these must now be added the 

 following five species : 



Squilla raphidea, Fabricius. Gonodactylus herdmani, n. sp. 



Odontodactylus brevirostris (Miers). G. acanthwus, n. sp. 



Protosquilla spinosissima (Pfeffer). 



The larvae in this collection which could be referred to already described forms are 

 recorded below under the names given to them by their describers. Those which do 

 not appear to have hitherto been met with, or at least not named, are not given new 

 specific designations, as I am of the opinion that such a proceeding in connection with 



