230 Dr. A. S. Packard, Jun., on Insects 



four or more longitudinal lines of tubercles obliquely pr(>ject- 

 ing outwards in the direction of the horn. 



There is another point of interest attaching to this Infuso- 

 rium, viz. that just after I had shown that the occasioially 

 blood-red colour of the sea round Bombay and the brown 

 colour of some of the freshwater pools of the island were 

 respectively due to the presence of myriads of Peridinea (Ann. 

 &Mag. Nat. Hist. vol. i. p. 258, 1858), Major Stuart- Wortley, 

 then (April 1859) at Calcutta, kindly sent me drawings of a 

 Ceratium which he had found in the freshwater pools about 

 that city. 



These, however, had four horns, and so far resembled 

 Perty's G. longicorne ; but being hastily sketclied, the micro- 

 scopic features were not given, and therefore the serrated ap- 

 pearance wliich characterizes the species of Nynee Tal is 

 absent. Still it is not improbable that this Infusorium (since 

 they are subject to much variety) may occasionally have pre- 

 sented itself under the_^?/7--horned condition ; for it is provided 

 with the point (Z*), which, if somewhat more develo])cd into a 

 horn, would exactly represent one of Major Stuart- Wortley's 

 sketches. At all events it is not likely that two distinct 

 species of such a Ceratium inhabit the fresh waters of India. 



I am unable to go further into the description of the speci- 

 mens from the lake of Nynee Tal, on account of their dried 

 state ; nor is it probable that in the fresh one they differed 

 from the same kind of Ceratia in any other way than that 

 mentioned. 



Perhaps, for the sake of distinction and future reference, 

 we might call this species Ceratium kumaonense. 



XXVIII. — On Insects inliabiting Salt Water. 

 By A. S. Packard, Jun., M.D.* 



In March 1869 the writer published an article on this subject 

 in the ' Proceedings of the Essex Institute, Salem,' vol. vi. 

 p. 41. Since then I have received an interesting collection 

 of insects from Clear Lake, Lake Co., California, made by 

 Prof. John Torrey in 1865, and which he kindly placed in my 

 hands for examination. Prof. A. E. Verrill has also allowed 

 me to examine several puparia of Ephydra from Great Salt 

 Lake, and during the past summer has dredged, at the great 

 depth of 20 fathoms, at Eastport, Maine, a living CMronomus- 

 larva, undistinguishable from C. oceamcus^ Pack., found by 



* From 'Silliinan's Ameiican Journal,' February 1871. 



