626 Memoirs of the Indian Museum. [Voi,. V, 



flatter blades, and the wings are very narrow or quite absent. In a fragment, evi- 

 dently from near the posterior end of a specimen, the feet are more translucent and 

 more elongate. They have i or 2 spines, and 1 dorsal and 2 ventral setae. The 

 blades of the setae are short, broad, and flat, with very narrow wings, and they taper 

 rapidly to a long fine tip. The setigerous lobe is more conical at the tip, and the 

 posterior lobe more elongate. 



The feet of this species are remarkable for the richness of their blood supply, and 

 they evidently function as branchiae. In many of the feet there is in the dorsal 

 region of the base a large heart-shaped structure full of blood (fig. i6j), into which a 

 number of vessels open. It is not present in all the feet, and is apparently formed 

 by the swollen junction of the blood-vessels. When present, it forms a conspicuous 

 spot on the dorsal side of the foot. From this ' heart ' a large vessel runs into the 

 foot, giving off numerous branches which lie under the cuticle on the front side of 

 the foot. A large branch runs round the margin of the setigerous lobe, and another 

 passes into the posterior lobe. All these vessels branch repeatedly, and the capillaries 

 finally unite to form large vessels lying on the posterior side of the foot. In the 

 fragment from the posterior end of the body, mentioned above, the blood-vessels are 

 greatly reduced in size and number. 



The mandibles (fig. i6p) are translucent, broad, and fused throughout almost 

 the whole length. The anterior or biting end is composed of numerous semi-rings. 

 There is very little pigment, which is confined to the lines of growth. 



The maxillae (fig. 16c) are stout and boldly curved. Their posterior portions 

 (the r supports,' or ' carriers ' ) are laterally deeply indented. This part varies greatly in 

 length, as is seen by comparing figs. 16c and i6d, but is always shorter than the 

 forcipate processes The posterior oblique margin is thin and frayed. Ikying on the 

 outer margin of the forcipate processes is a long thin horny plate. The great dental 

 plates have each 4 large teeth. At the anterior end each has a flat cap (fig. i6e). 

 The dental plate itself is rather narrow, but it has a broad dorsal flange lying behind 

 the forcipate process. The 3rd pair of jaws are bidentate. The 4th pair have each 

 a stout tooth, which may be slightly bifid at the tip, possible through abrasion. 

 L/ying ventrally to the 3rd and 4th pairs of jaws is a thin rectangular coarsely dotted 

 plate on each side. 



So far as one can judge from the brief description and inadequate figures, this 

 species resembles L. atlantica, Kinberg (1910, p. 47), from the mouth of the Rio de la 

 Plata, especially in having only slender capillary setae. It appears to differ in the 

 shape of the head, and in having two teeth on the 3rd pair of jaws. 



Habitat. — Fragments of six specimens were taken at two stations, both of them 

 on the shore of the south-western extremity of the lake, at Rambha, in mud. Of 

 one station, no further information is available. The other station was in March, 

 and the specific gravity of the water was l'on. 



