I9I5-] H. H. Godwin- i\.usTEN : Mollusca, III. 501 



whorls from the suture outwards. Spire scarcely raised above the 

 last whorl. Suture impressed, the tube 4^ mm., behind the aper- 

 ture, a mere orifice, but in the perfect shell there may be a tube. 

 Whorls 4, increasing regularly. Aperture circular, oblique. Peris- 

 tome double, inner and outer lips continuous, the inner with a 

 slight notch near sutural margin, the outer expanded into a wing 

 or spout. 



Size: major diam. I4'0 ; alt. axis 4*0 mm. 



The habitat of this species at the head of the Irrawady valley 

 (not a very far distant one from the Tsanspu) is interesting and 

 I have introduced it here because in the sutural tube it approaches 

 a species found in the Abor Hills, which I next describe as Spira- 

 culum minimum , and is much smaller. It also recalls Spiraculum 

 andersoni, Blf. , from Bhamao, but this is more openly umbilicated, 

 the wing similar. My best thanks are due to Capt. C. E. Morris. 



Spiraculum minimum, n. sp. 



(PI. xl, figs. 2, 2rt, 2b, 2C). 



Locality: Jeku, Abor Hills, two specimens (/. Coggin Broion). 



Shell orbiculate, depressed, widely umbilicated. Sculpture, 

 fine transverse lines of growth on the epidermis. Colour dull 

 ochraceous, with a green tinge, 3rd and last whorls crossed by 

 irregular broadish brown bands, indication of a band just below 

 the periphery. Spire depressed, but apex well above last whorl. 

 Suture impressed, the tube short, close behind the aperture, 

 onl}' 2 mm. distant. Whorls 4, regularly increasing. Aperture 

 circular, with very slight angulation at sutural margin.' Peris- 

 tome double, both inner and outer lips continuous, moderately 

 thickened and slightly reflected. 



Size: major diam. 9*2; alt. axis 3"25 mm. 



Type No. 6142-43 Ind. Mus. 



Ivt. G. F. T. Oakes, R.E. has sent me seven examples of 

 this species from Sibbum, far finer in size; four are bleached. 

 The largest measures 10 mm. in major diameter, No. 3I4> B.M. 

 Three are perfect (No. 3145 B.M.), with strong epidermis. Colour 

 sienna brown in tint with ochraceous mottling, with an indistinct 

 peripheral band. Major diam. 11 "3 mm. 



This is a close ally of Spiraculum kempi, but the closely 

 mottled zig-zag pattern and black peripheral band is not seen in 

 that species ; in this respect it is similar to Spiraculum nevilli of 

 the Dafla Hills; it is smaller and rather flatter than that shell. 



It is hardly possible to find better examples showing the deve- 

 lopment of the sutural tube in Spiraculum than in the species 

 figured on Plate xl. Although it is not from the Tsanspu Valley 

 but from the source of the Irrawady, Spiraculum putaoensis has been 

 introduced in order to show how close is the relationship and how 

 beautiful evolutionary stages have been. In having a tube on 

 the suture behind the peristome and a simple peristome, both 



