On some Indian Phyllopoda. 17 



Leptestheria Hendersoni, G. O. Sars, n. sp. 

 (PI. III.) 



Specific Characters. — Female. Shell large and 

 compact, and less compressed than usual; seen laterally, of 

 a somewhat irregular oblong oval form, with the height slightly 

 exceeding half the length, dorsal margin straight only in the 

 middle, being deflexed both in front and behind, and joining 

 the free edges without any intervening angle, ventral margin 

 slightly insinuated in the middle, both extremities rounded 

 and almost equal ; umbones slightly prominent, and occurring 

 far in front. Valves rather thick and opaque, with nume- 

 rous rather faintly marked lines of growth, especially densely 

 crowded together in the peripheric part. Surface between 

 the lines smooth and shining; edges of the valves smooth. 

 Colour dark brown. Animal of the structure characteristic 

 of the genus. Head with the occipital projection abruptly 

 recurved, terminating in a sharp point, ocular region strongly 

 protuberant, rostral part narrowly rounded at the end, apical 

 spine procurved. 25 pairs of legs present, all, except the 

 hindmost ones, with the distal part of the exopodite divided 

 outside into 5 or 6 very sharply defined setiferous lobules, 

 appendicular plate large and securiform, epipodite greatly 

 produced in the middle pairs, dorsal lappet of the exopodite 

 in the 10th and 11th pairs transformed in the usual manner. 

 Caudal piece comparatively narrower than in the preceding 

 species. Length of shell 14 mm. 



Remarks. — This also is a very distinct and easily re- 

 cognizable form, looking rather different, as regards the shell, 

 from the other known species, but at once proved to belong 

 to the present genus by the structure of the enclosed ani- 

 mal. There are only 2 specimens in the collection, both of 



2 — Archiv for Math, og Naturv. B. XXII. Nr. 9. 

 Trykt den 9de Juli 1900. 



