46 LAND AND FRESHWATER 
Size: Fig. 5. Type, major diam. 8°5; alt. axis 32:0 mm. 
Largest bleached shell, i 9-2; i oo: 1s, 
This species was given to me by Colonel Maxwell ; obtained on 
one of his tours in the Naga Hills, East of the Anghami Naga 
tribe. 
GuessuLa (RisHETIA) MAsTERSI, n. sp. Type. (Plate CLXII. 
fig: /1).) 
=macera, Nev. MS. from Assam. 
Locality. Golaghat, Assam; 38 specimens found. BIf. Coll. 
843.06.1.1 B.M. (Masters). Same locality. 40.06.38. B.M.,2 ex- 
amples ; 837.06.1.1 B.M., 5 examples. 
Shell eclongately turreted; sculpture distant striation; colour 
pale ochraceous; spire long, sides flat; apex is fine, increasing 
gradually (Pl. CLXILTI. fig. 20; another specimen No. 837.06.1.1 
B.M., Blf. Coll., from same locality, Pl. CLXIII. fig. 22), suture 
shallow; whorls 9, very flatly convex; proportion of spire 
to last whorl 100: 49, having a slight shoulder below the suture ; 
aperture rather narrow ; columellar mar gin nearly vertical. 
Size: major diam. 6-5; length 17-5 mm. Largest specimen, 
apex broken, major diam. 70, 
It is very close to G. sarissa, Bs., but side of spire differs. 
This species was found in Dr. W. T. Blanford’s collection and 
unnamed. It was sent to him with other shells found by 
Mr. Masters in 1860, on the low spurs near the hot spring at 
the Falls of the Namba River, the home of that fine species 
Rhiostoma mastersi, figured in the ‘ Conchologia Indica,’ 1870, 
pl. v. fig. 1, without description, as Plerocyclos (Spiraculum) 
masterst, Blanford MSS., afterwards described by Wm. Blanford in 
Journ. Asiat. Soc. Bengal, 1877, pt. 2, p. 513, as from hills south 
of the Assam Valley not far from Golaghat. Some years later 
I happened to encamp at the exact locality as given above. The 
shell is hairy in fresh specimens, as stated by Blanford. 
Among the Glessule since recorded from the Indian Museum, 
under No. 80, Nevill, ‘ Hand-list,’ p. 170, no. 3639, are some 
12 examples of mastersi from Assam, labelled W. Blf. with the 
name ‘macera” in Nevill’s handwriting. Writing to me in 
August 1880, Nevill gave this name to all the shells catalogued 
under No. 80. G. macera is a very distinct and attenuate species. 
GressurA (RIsHETIA) MASTERSI, n. sp., var. (Plate CLXII. fig. 3.) 
No. 3339 B.M. 
Locality. Augaoluo Peak, 6777 ft., Naga Hills, 2 specimens 
(M. Ogle). 
Sculpture: the embryonic whorls (Plate CLXII. fig. 21) are 
strongly costulate next the smooth apex, and regularly so to 
the last whorl; colour dark umber-brown ; whorls 9. 
Size : major diam. 7'0; alt. axis 20:0 mm, 
Agrees with the Golaghat specimens. 
5 other specimens were obtained in the Naga Hille; precise 
locality not noted. 
