MOLLUSCA OF INDTA. 18] 
“The largest species yet discovered in Burma, and the most 
symmetrical, so far as I know, of all Asiatic forms. None of the 
Burmese representatives of Diplommatina show the strongly acumi- 
nate spire, or the great swelling of the antepenultimate whorl, which 
distinguishes the species inhabiting the Himalaya.” 
Drrerommatina NANA, W. T. BIf. (Plate XLIX. figs. 6, 6a.) 
Diplommatina nana, W.'T. Blanford, J. A. 8S. B. 1865, p. 85; 
Hanley, Conch. Ind. p. 55, pl. exl. fig. 1; Theob. Supp. Cat. p. 42; 
Nevill, Hand-list, p. 285. 
Original description :—** Shell not rimate, dextrorse, subovate, 
rather solid, amber-coloured, very finely and closely filiformly costu- 
lated on the lower whorls, less closely on the upper, or, frequently, 
subdistantly costulated throughout. Spire conical, with sides scarcely 
convex above; apex rather obtuse, sometimes reddish, suture im- 
pressed. Whorls 6-63, rounded, antepenultimate the largest, the 
last rising considerably upon the penultimate. Aperture vertical, 
ear-shaped, nearly circular, columellar margin straight for a short 
distance and vertical, with an internal tooth. Peristome double, 
both portions expanded and appressed, the inner forming a thin 
callus upon the penultimate whorl. Operculum r4 
mm. inch. 
soneth 5... ce ses 23 0-09 
Diameter... i... 1 0-04 
*“‘ Aperture with peristome about } millim. in diameter. 
“ Habitat. Akoutoung, Thondoung, and Yenandoung in Henzada 
district, Pegu. 
“This species approaches D. polypleuris, Bens., more nearly than 
any other. It is distinguished by its more regularly ovate form, 
blunter apex, less swollen penultimate whorl, and more marked 
and distant sculpture. The latter character, however, varies—the 
specimens from Thondoung, a hill about 20 miles south of Akoutoung, 
being either closely costulate throughout, or subdistantly sculptured 
above, closely below ; while in Akoutoung specimens the costulation 
is subdistant throughout As, however, I can trace no other dis- 
tinction between the shells, and the costulation varies in different 
individuals from each place, I do not think there is any specific 
distinction.” 
Dretommatina AFFINIS ?, Theobald. (Plate XLIX. fig. 3.) 
Diplommatina affinis, Theobald, J. A. 8. B. 1870, p. 398; Hanley, 
Conch. Ind. p. xii (index only) ; Theob. Supp. Cat. p. 41. 
Locality. Upper Salwin valley (ex Theobald’s collection). 
Shell elongately fusiform, rimate; sculpture much worn, costu- 
lation close; colour bleached; spire turreted, attenuate towards 
apex ; suture moderately impressed ; whorls 7, rounded, antepen- 
PART V. R 
