1922.] 



W. M. Tattersali, : Indian Mysidacea. 



4 6 3 



Remarks. — These speci- 

 mens agree with Hansen's 

 description but since the 

 author has not published any 

 figures illustrating this spe- 

 cies, I give herewith a figure 

 of the antennal scale and of 

 the telson and uropods to 

 illustrate the salient charac- 

 ters of the species. The dis- 

 tal part of the lateral mar- 

 gins of the telson is minute- 

 ly serrulate. 



Distribution. — Gulf of 

 Siam (Hansen). 



Text-fig. 9. — Erythrops tninuta, Hansen. 



a, antennal scale and peduncle; b, telson 



and uropods. Both X 65. 



Erythrops nana, sp. nov. 

 Text-figs. 10 a-c. 



Three females, 



Locality. — Port Blair, Andaman Islands, St. 3. 

 one male, 3 mm. (Types.) 



Description. — Frontal plate produced into a short, pointed 

 rostral process. Eyes small, depressed, scarcely broader than the 

 eyestalks. Antennal scale scarcely as long as the antennular 

 peduncle, four times as long as broad, outer margin smooth, ter- 

 minating in a strong spine distally, beyond which the terminal 

 lobe of the scale projects considerably ; terminal lobe longer than 

 broad with a distal articulation. Telson broader than long, pos- 

 terior margin nearly half as long as the greatest breadth, with 

 three pairs of spines and a median pair of plumose setae ; the 

 inner pair of spines longer than the next pair while the outer pair 

 are quite small; the lateral margins of the telson unarmed. 



Uropods more than twice as 

 long as the telson, inner and 

 outer branches equal in 

 length, no spines on the 

 lower inner margin of the 

 inner uropod and its inner 

 margin not serrulate. 



The specimens are very 

 mutilated but the remain- 

 ing appendages do not call 

 for special comment. They 

 agree in the main with 

 those of Erythrops elegans, 

 the species to which E. nana 

 is most nearly allied. It differs from this species in the shorter 

 antennal scale, in the armature of the apex of the telson which 

 has an extra pair of spines, and in the equal outer and inn^r 



Text-fig. 10. — Erythrops nana, n. sp. 

 a, telson and uropods ; b, antennular ped- 



uncle ; c, antennal peduncle and scale 

 x 65. 



All 



