MOLLUSCA or INDIA. 135 



Those ill No. 5 show a certain modification in their form : — 



Maceochlamts kala, (t.-A. (Plate XL. figs. 6 & 7.) Bhutan Hills. 



The capsule is studded on one side with short bifid spines ; the 

 flume is much enlarged, broad, with minute spines at the basal 

 end. It is seen, in fig. 6, in process of development within the 

 male organ. 



NiLGiRiA TRANauEBARiCA, Fabr. (Plate LXXXI, figs. ^ c, 3 c^.) 

 Madras. 



Capsule elongate ; flume short, spikelet in bunches of four short 

 equal spikes, on one side. 



During development its shape is, however, very diff'erent (see 

 Plate XCIV. figs. 5-5 t). It is very much shorter, the spines are 

 closer together, and the long capsule, as seen in the spermatophore, 

 is now short and bulbous (figs. 5 6,5 c). In its passage through the 

 main duet of the male organ such a soft pliant structure would 

 undergo, I imagine, considerable gradual pressure and be stretched 

 out. In fig. 5 d may be seen the junction of the vas deferens, with 

 the positioii of the spermatophore indicated by the points of the 

 spines lying just below the muscular covering of the fiagellum. 

 When a glass slide was placed over this and gentle pressure brought 

 upon it, the spines all came into view, as shown in fig. 5 e, and on 

 reversing the slide the flumo and capsule only were seen, shutting 

 out the view of the spines. The spiral form of the flume is due, of 

 course, to contraction in spirit, and allowance must be made for this 

 in all these drawings. 



In a fresh specimen the spermatophore could be removed entire ; 

 but in this case it is so strongly bedded in the muscular envelope 

 and hardened by the alcohol, I failed to do so. Still the exact 

 position it occupies while developing is pretty clearly made out, 

 and enables us to understand the figures illustrating the next species. 



EuPLECTA BiNOYAENsis, G.-A. (Plate XCVIT. figs. I b, 1 c.) 

 Ceylon. 



The pouch-like flume has short bifid spines down one side ; these 

 near the capsule become longer in branched pairs, springing from 

 one point; they become very minute towards the top of the capsule*. 



EuPLECTA PARTITA, Pfr. (Plate LXXXVII. figs. 1 a, 1 b, 1 c.) 

 Ceylon. 



This is probably of same type. 



Ariophanta l.s;vipe8, Miiller. (Plate LXXX. fig. 5 6.) Bombay. 



The spermatophore seen in process of formation seems of this 

 type so far as could be made out, and is placed here until it can be 

 obtained in its full development. 



* Eu'plecta hyphusma. — During the past inontli, while these pages have been 

 passing through the press, I have been able to locate this species by the dissec- 

 tion of specimens sent me by Mr. O. CoUett. The spermatophore is similar lo 

 that of E. binoyaends. 



PART IX. ^=--^ — ^ 



