150 Dr. Arnott o?i some neiv or rare Indian Plants. 



are curved with a sigmoid flexure towards the stomach ; in 

 both the species examined the curve is but slight and always 

 from the centre of the animal. 



The ridges of cilia are represented by Professor Grant as 

 extending the whole length of the animal from mouth to anus. 

 This probably indicates a difference of species. The rows of 

 cilia do not appear to me to be webbed, especially in the se- 

 cond species ; and when in motion, it seemed as if the lateral 

 cilia in each rows moved before the central, thus causing an 

 undulating appearance and a play of colours. I could not 

 observe the filaments branching out from the nervous circle 

 as figured by Professor Grant. 



The whole structure of the animal examined conveyed the 

 idea of the bilateral rather than of the radiate type, and 

 tended to confirm the opinions of M. Blainville on that sub- 

 ject. 



M. Blainville's character of Cydippe might be amended thus : 



Body regular, free, gelatinous, oval, divided into eight lobes, 

 each crowned by a ridge furnished with transverse rows of 

 vibratile cilia. 



Mouth opening into a compressed and 4-lobed stomach, 

 from which a canal proceeds to the anus. A cavity on each 

 side of the centre opening towards the anal extremity and 

 containing a long semipinnated retractile filament. 



REFERENCES TO PLATE II. 



1. Cydippe No. 2. 



2. Cydippe No. 1. 



3. Diagram of stomach and filamentary cavities. 



4. Section showing vessels. 



XVI. — Descriptions of some new or rare Indian Plants, By 



G. A. W. Arnott, Esq., LL.D. 



[Continued from p. 92.] 



LoPHOPETALUM, Wight, MSS. {Celastrinece). 



Calyx scutelliformis 4 — 5-lobus, lobis rotundatis brevibus. Petala 

 4 —5 sessilia orbiculata patentia, supra circa basin cristis lobulisque 

 carnosis instructa versus marginem nuda Isevia. Torus discoideus, 

 4 — 5-gonus crassus carnosus calycis cavitatem omnino implens. 



