450 



Records of the Indian Museum. [Voi,. XXIV, 



small spines between them, extending from the anterior edge of 

 the statocyst almost to the apex. 



Outer uropod with the 

 proximal joint more than 

 twice as long as the distal, 

 its outer margin with three 

 or four spines at the distal 

 end only ; terminal joint one 

 and a quarter times as long 

 as broad. 



Remarks. — This species is 

 distinguished by (i) the ab- 

 sence of a rostral projection 

 (ii) the unjointed tarsus of 

 the thoracic limbs and (3) 

 the size and armature of 

 the telson and uropods. It 

 is most closely allied to 

 S. guadrispinosa and S. no- 

 dosa, but the combination 

 of the three characters 

 named will serve to distin- 

 guish it from both these 

 species. It ; lso shows many 

 points of resemblance to 5. brevicaudata described below, but dif- 

 fers in the relative size and the armature of the telson. Both 

 species agree in the absence, of a rostral projection and the un- 

 jointed tarsus of the thoracic legs. 



Text-fig. 2. — Siriella hanseni, sp. nov. 

 Telson and uropods : X 65. 



Siriella brevicaudata Paulson. 

 Text-figs, ^a-h, <\a-f. 



Siriella brevicaudata, Paulson, 1875 (1), p. 30, pi. i, figs. 15-16. 



,, ,, Paulson, 1875 (2), p. 123, pi. xx, figs. la-m. 



,, ,, Czerniavsky, 1882, p. 109. 



,, ,, Czerniavsky, 1883, p. 32. 



Localities. — Kilakarai and Pamban, Gulf of Manaar, from 

 weeds, 0-2 fathoms , February I2th-25th, 1913. Abundant, adult 

 males and females. 6 mm. long. 



Remarks. — The rediscovery of this species, not recorded since 

 Paulson originally described it in 1875 from specimens taken in the 

 Red Sea, is a matter of great interest. Paulson's original descrip- 

 tion is in Russian and I am obliged to rely on his figures, but these 

 specimens agree so closely with Paulson's figures that I am con- 

 fident of the correctness of my determination. 



In his ' Siboga ' report (1910) Hansen arranges the Asiatic 

 species of Siriella into four groups, but he does not include S. brevi- 

 caudata in his list. It belongs to his group I and is specially 

 distinguished in that group by the size and armature of the telson, 

 its chief character being reflected in its specific name. 



