MOLLUSCA. OF INDIA. 133 



no doubt serves as a way or channel for the spermatozoa. It is 

 always spined, and in five different ways, as follows : — 



1. At the base of the capsule and anterior end of the flume, the 

 intermediate portion being straight-edged, with no spines. 



2. At the base of the capsule and down one side of the flume. 



3. At the base of the capsule and down both sides of the flume. 



4. None at base of the capsule, but down both sides of the flume. 



5. Spines on side of capsule ; capsule elongate, pointed ; flume 



short or broad, stout, and thickened into a sort of pouch. 



The first four have a general uniformity, and the species examined 

 include : — 



AusTENiA GiSAS, Bs. (Plate XC. figs. 1-3.) Khasi. 



Capsule long, basal processes cervicorn, few ; the flume short, no 

 marginal spines, subplumose spines at terminal end. 



AirsTENiA BCTLERi, G.-A. (Plate XC. fig. 10.) Naga Hills. 

 Basal processes to capsule numerous. 



GiKAsiA HOOKEKi, Gray, var. shillongensis, G.-A. (Plate 

 LXXXVIII. figs. 1-1 b.) Khasi Hills. 

 Similar to A. gigas. 



Atjstenia shanensis, G,-A. (Plate XCI. fig, 3 c.) Burmah. 

 Also like A. gigas. 



Mari^lla (=Dekhania) dusstjmieri, Val. (Plate XCIII. figs. 1 

 b, c.) Mysore. 



Capsule moderately long, cervicorn processes at base of it ; 

 flume long, with no spines, single plumose branchlets at the base. 



Macrochlamts udus, n. sp., G.-A. (Plate XCIV. fig. 1.) Assam 

 HiUs. 



Spines on flume ; single and double short spikes. 



Macrochlamys elemingi, Pfr. (Plate LXXXVII. figs. 2-2 d.) 

 Murree Hills, Punjab. 



The capsule very long ; spines on both sides of flume. 



Macrochlamts pedina, Bs. (Plate LXXXIII. figs, 5-5 c.) 

 Bombay. 



Capsule very long ; flume of great length, branched on both 

 sides ; spines blunt and stout at base of capsule ; the rest are bifid 

 twigs, springing from a single basal stem. 



Bensonia labiata, Pfr, (Plate LXI. figs. 5e-5g.) N.W. Hima- 

 layas, 



Capsule not seen complete ; flume with spikelets close-set, short, 

 and bifid. 



