MOLLUSCA OF INDIA. 275 



EuAiJSTENiA scuTELLA, Benson. (Plate CXXIV. figs. 3, 3 a, 

 36,3 c.) 



Localitij. Chamba. 



Gemtalia. To tlie penis (fig. 3 a, 3 6) there is a short kale-sac 

 where the vas deferens joins, the epiphallus is long, a caecum is 

 given off from the head of the penis-sheath and is closely coiled, to 

 this the retractor muscle is attached — in every respect it is like the 

 male organ of MacroMamys. The amatorial organ (fig. 3) is stout, 

 sausage-shaped, at the distal end tapering rapidly to the retractor 

 muscle. The spermatheca is rather long and pear-shaped. 



Jaw (fig. 3 c) well arched, with a strong central projection. 

 Radula formula : 



25 . 1 . 17 . 1 . 17 . 1 . 25 

 or 43 . 1 . 43. 



Centre tooth bicuspid, admedians with one large cusp on the outer 

 side, and a small cusp on upper inner side below point, marginals 

 unevenly bicuspid. 



EuAUSTENiA SCUTELLA, Bensou, var. (Plate CXXIV. figs. 4-1 d.) 

 (Plate LII. Vol. I., figs. 1, 1 «, 1 6, animal.) 



Locality. Murree, Punjab Himalaya. 



The form from this locality, far to the north-westward, departs 

 slightly from that of Chamba. 



The genitalia (fig. 4) are on the same plan, with this variation — 

 the amatorial organ is very globose and club-like, attenuate near 

 the generative aperture ; in the penis the kale-sac is shorter. 



The radula has a greater number of admedian teeth, viz. : — 

 -I- 1 . 20 . 1 . 20 . 1 + 

 or 41 to 35 central and admedian. 

 In the Chamba form the marginals were not perfect, only a slight 

 indication of an upper inner cusp to the admedian teeth. The 

 jaws (fig. 4(?) differ very much in their form, that of the Murree 

 species being less solid and differently arched. 



The spermatophore (fig. 4o) is a beautiful elongate delicate 

 object, the capsule alone being nearly 8 mm. in length, it is longer 

 than any I have as yet come across. Tlie spines on the flume 

 next the capsule (fig. 4 6) are bicuspid, on one side only they do 

 not extend far, and are soon succeeded by minute straight spines 

 on both sides of the flume, larger near the end (fig. 4 c). 



Mr. Benson described E. scutella from a speciu)en sent to him 

 by Mr. W. Theobald from Nasmana on the Chinab Eiver (Plate LII. 

 Vol. I., figs. 1 c, 1 d, 1 e), some 50 miles up the valley from its 

 debouchement into the plains. Chamba is not far off on the 

 south-east, practically in a similar country and similar climate, 

 and what might be called the same drainage area. I therefore am 

 led to consider the Chamba specimen described as closest to the 

 tvpe, whereas Murree is more remote to the north-west, and in 

 quite a distinct drainage area of the Indus ; the small differences 

 between the two constitute the Murree form as a variety. 



