124 



Records of the Indian Museum. 



[Vol. XXIV, 



terior tooth is placed in front of the middle of the carapace, the 

 second is behind the orbit, while the foremost is small and is not far 

 removed from the apex. On the lower border there are from i to 3 

 teeth, 1 usually 2, which are large and placed in the anterior half of 

 the rostral length. 



In the position usually occupied in other genera by the supra- 

 orbital spine a small angular prominence or tubercle may be 

 detected and extending downwards from this tubercle to the base 

 of the antennal spine there is a well-defined curved ridge parallel 

 with the orbit. From this ridge the carapace slopes obliquely 

 inwards to the orbital margin, the orbit thus having a broadly 

 bevelled edge. The antennal spine is strong ; the hepatic spine is 

 placed behind it, but on a lower level. 



The eyes are stout with short, thick stalks. The cornea is a 

 little wider than the stalk and frequently, as in some species of 

 Periclimenes , shows two concentric bands of dark pigment. The 

 ocular spot touches the cornea. 



The basal segment of the antennular peduncle (text-fig. 2a) 

 is broad ; the lateral process does not reach the middle of the seg- 

 ment ; the terminal spine is rather short and the margin between 

 this spine and the articulation of the second segment is nearly 

 straight. The two distal segments are stout. The free portion of 



the shorter ramus of the outer flagellum is 

 half or rather less than half the length of 

 the fused basal part, the latter consisting 

 of 8 to 10 segments. The total length of 

 the shorter ramus is equal to or rather less 

 than that of the peduncle. The antennal 

 scale (text-fig. 1) is from 3*3 to 4 times as 

 long as wide, proportionately longest in 

 males, and is strongly narrowed apically. 

 The outer margin is straight or very slightly 

 concave and terminates in a spine which 

 reaches far beyond the end of the lamella. 



There is a minute arthrobranch at the 

 base of the third maxilliped. The exopod 

 almost reaches the end of the antepenul- 

 timate segment and the ultimate segment, 

 excluding the terminal spine, is about 

 three quarters the length of the antepenul- 

 timate. 

 The first peraeopods reach beyond the apex of the antennal 

 scale by considerably more than the length of the chela. The 

 carpus is about equal in length with the merus.and is from ro to 

 1 25 times as long as the chela. The fingers are longer than the 

 palm and are unarmed. 



The second peraeopods in adults of both sexes reach beyond 

 the antennal scale by the whole of the chela and carpus. The 



Text-fig. i. — Palaemo- 

 nella vestigialis, sp. 

 nov . 



Antennal scale of female. 



Of thirteen specimens two have 1 ventral tooth, ten have 2 teeth and one 



