78 



HELICIDJE. 



Plectoj)i/Us (Endothyra) blanda, Gude, Science Gossip, n. s. \i, 1899, 

 p. 148. 



Orir/iiial description : — " Shell sinistral, depressed conical, widely 

 and deeply umbilicated, wliitish-corneous, finely and i-egularly 

 ribbed. Spire conical, apex prominent, suture distinctly im- 

 pressed. "Whorls 6, tnmid above, rounded below, increasing very 

 slowly and regularly, the last not descending in front, angulated 

 above the periphery and around the wide perspective umbilicus. 

 The cuticle is produced into deciduous hairs on the ribs, forming 

 spiral rows. Aperture oblique, lunate, a little flattened on the 

 upper, outer margin. Peristome white, a little thickened and 

 reflexed, the margins united by a slight, flexuous ridge on the 

 parietal callus. Parietal wall with a strong, vei-tical plate, slightly 

 deflected anteriorly and having two minute denticles posterioi-ly, 

 the upper elongated vertically, the lower horizontally. A very 

 thin horizontal fold occurs below the vertical plate and a very 



/ 



Fig. 28. — Plectojnjlis hianda. 



short fold above it. Palatal folds in two series ; the anterior 

 consisting of six thin horizontal folds, the first and sixth a 

 little shorter and placed a little further back than the other 

 four ; the posterior series consists of four very short folds or 

 denticles. 



•' Major diam. 0, minor 5 millim. ; alt. o millim."' {Gude.) 



Hah. Assam : Naga Hills. 



Differs from P. minor in being larger and more elevated, and in 

 liaviutr a wider and deeper umbihcus. The parietal armatui-e 

 differs in having an additional fold above the vertical plate, and 

 tlie anterior denticles are almost united to this fold. The palatal 

 armature differs in the posterior folds being very short and almost 

 reduced to denticles. Fig. 28 d gives the posterior view of the 

 two armatures, e shoves the inside of the outer wall with the 

 J'olds and denticles, and /' a portion of the parietal wall with 

 the plates, folds, and denticles in situ. All the figures are enlarged. 



