314 W. T. Blanford — Spiraculum Masters!. 



the specimens, however, have since been distributed with the names I gave 

 orio'inallj, and the Sjnraculum, which is the most remarkable and inter- 

 estino" of all the shells fomid, has been figured in the ' Conchologia Indica' 

 from a decorticated specimen. As no description of this curious form has 

 ever been published, I give one. 



This shell differs from all other known forms of Spiracidum by having 

 the last whorl free and descending for a considerable distance, and by 

 having, besides the sutural tube, a projection, frequently of a subtubular 

 form, from the top of the peristome. The species has some resemblance to 

 Bhiostoma, and still more to Opistlwpoinis hirostris. 



Spieaculum Masteesi. 



Syn. '• Tterocyclos fSp.J Mastersi, Blanford, MS.,' Hanley and Theobald, Conch. 

 Ind., PL V, f. 1.— Pfeififer, Mon, Pneum., Supp. Tert. pp. 54, 386. 



Testa latissime umhiUcata, dep^essa, epidermide crassiuscidd, fiisca, 

 scalrd decussato-sulcostulatd induta, atque liris trihus pilosis, una juxta 

 periplieriam, altera supra, tertid infra, circumdata ; suh epidermide alba, 

 fasciis anqulatis transversis castaneis notata ; lineis incrementi confertis 

 lirisque spiralihus minutis magis distantihus decussatim ornata. Spira 

 fere plana, apice vico emersd. Anfr. 5, rotundati, ultimus aniice longe so- 

 lutus valde descendens, paulo anite solutionem tubulo hrevi, curvato, pervio, 

 longitudinaliter striata, ad anfr. penultimum excurrente, antice compresso, 

 in riniam apertam intra anfr actum ultimwn desinente, post ice tereti, extus 

 patente, 6-8 mill, pone aperturam oriente, munitus. Apertura diagonalis, 

 circularis ; peristoma incrassato-expansum, subdiiplex, superne in rostrum 

 sultiibuliforme, antice porrectum, excurrens. Operculum corneum, intus 

 concavum, extus convexum, marginihus anfractuum liheris lamelliferis. 

 Diam. maj. peristoniate incluso 24, onin. 16|, alt. 5, ap. diam-. intus 6 mill. 



Hab. in montibus Naga dictis, ad latus meridionale provincise Assam, 

 hand procul a Golaghat. 



The fio"ure in the Conchologia Indica rej)resents a specimen completely 

 divested of its epidermis and more brightly coloured than usual. The sub- 

 tubular projection from the upj)er portion of the peristome is frequently 

 much more developed than in the figure. The three hairy ridges on the 

 epidermis surrounding the last whorl are only found in fresh well preserved 

 specimens. In a drawing which I possess, made from a living individual, 

 the hairs on these ridges are shewn to be arranged in tufts. 



I 



