HOLKEION. SESAEA. 241 



There is no trace of the coiled caecum found in typical forms of 

 Macroclilamys. 



The jaw (D) is rather angularly semilunar, smooth, very con- 

 cave in the middle. Radula of about 75 rows, with about 

 135 teeth in a row (55 . 12 . 1 . 12 . 55) : the median and admedian 

 rows tricuspid and broad, with the middle cusps prolonged ; 

 laterals bicuspid, curved outwards and very pointed. These details 

 are taken from Stoliczka's description, [which is very accurate, but 

 the teeth of the radula are not well drawn]. 



[Specimens from Mergui sent me by Mr. Theobold which I have 

 dissected confirm Ferdinand Stoliczka's descriptions, with the ex- 

 ception of the radula, in which the median teeth are quite plain 

 and straight-sided, without any trace of the usual cusps, the outer 

 teeth being bicuspid.] 



365. Holkeion arata, Blf. Nanina (Rotula), P. Z. & 1869, p. 448; 

 Pfr. (Helix) Mon. Hel vii, 1876, p. 302 ; H. Sf T. (Helix) C. L 

 1876, pi. 84, figs. 8, 9, 10 ; Nevill, Nanina (Rotula), J. A. S. B. 1877, 

 2, p. 15. 



Similar to H. anceps, but much larger, and with considerably 

 stronger plicate oblique sculpture above and radiating strisa 

 beneath, not polished below ; whorls 7, slightly convex above, 

 the last rather less swollen beneath than in H. anceps and some- 

 what more sunken around the perforation. 



Major diain. 22, min. 20, height 10 mm. Some specimens are 

 even larger. 



Hcib. Bhamo, Upper Burma. A smaller variety was obtained 

 at Ponsee in Yunnan [var. minor of Blanford]. 



Genus SESARA. 



Sesara, Albers, Heliceen, ed. 2, 1860, p. 91 ; Stoliczka, J. A. S. B. 

 1871, 2, p. 242. 



Type, S. infrendens, Gould. [Fig. 81, D-D 2, p. 242.] 



Range. From the Khasi Hills to Burma and Tavoy, also Western 

 Siam. 



" Shell perforate or imperforate, conoidly depressed, turbinate 

 or trochiform ; typical forms transversely costulale or costulately 

 striated above, smooth and polished below. Several of the species 

 have teeth in the aperture. 



"Animal (of S. infrendens and S. pylaica) long and with a narrow 

 foot ; the terminal gland distinct, and a small hooked and pointed 

 appendage above it. The sole has two longitudinal grooves, rather 

 close together, the median portion narrower than each of the outer 

 parts. The mantle-edge is nearly entire; the left shell-lobe is 

 below internally considerably thickened, the left dorsal lobe is very 

 small or almost obsolete ; the right shell-lobe thin and somewhat 

 convex, but without separate appendage." (Stoliczka.*) 



Genitalia (from Stoliczka's description) (fig. 81, D). The re- 

 ft 



