1880.] G. Nevill — Nciv Species of Brachisli-ivaterllollnshs. 1G5 



except near the timbilicus and in the interstices of the spiral sulcations ; 

 the narrow smooth ledge below the suture, on the last two or three whorls, 

 formed bj an abrupt cessation o£ the sculpture, is very peculiar and charac- 

 teristic. I need scarcely say that I have named this remarkable species after 

 my friend Mr, William Theobald of the Geological Survey of India. 



Type Indian Museum, Calcutta ; also in coll. Theobald, Hungerford, 

 Beddome, Blanford, Dohrn, and Joly. 



ASSIMINEA MICEOSCULPTA, n. Sp. 



T. parva, vix perforata, cylindrico-coiiica, solidiuseula, vix nitida, 

 fulvo-cinerea, spiraliter distincte sulcata, striis longitudinalihus oiliqicis 

 ac flexuosis decussata, apice acuto ; anfr. gradato-cylindrici, suprenii 

 laeves, 2dus spiraliter sulcafus, Stuis et Atus insigne equaliterque deciissati 

 {quasi gemmulati), ultimus suhhiangulatus, supra peripheriam angu- 

 latus, striis dccussantibus paululum subohsoletis iiotatiis, sculptura infra 

 cianescenfe ; apertura suhverlicalis, parva, marginihus callo indistincto 

 jimctis, margine colimellari Jiaud contorto, leviter rotundato. 



Long. 2f , diam. If mill. 



Hab. Port Canning. 



Type Indian Museum, Calcutta ; also in coll. Dohrn, Joly, Hungei'- 

 ford, Theobald, Blanford, and Beddome. 



It presents some resemblance to the preceding species in the sculpture, 

 which in Ass. microsculpta, however, is much more strongly developed, 

 the difference in young specimens being especially marked. The shape 

 is quite different, the whorls being cylindrically-gradated, instead of con- 

 vexly-swollen, &c. 



ASSIMINEA HXJNGtERFOEDIANA, n, Sp. 



T. imperforata, ovato-conica, solida, nitida, glabra, polita,omnino laete 

 castanea, sutura suhindistincta ; spira Irevis, apice vix acuto ; anfr. 6, 

 siiblumide convexiuscuU, ultimus magnus, regulariter ovuliformis, infra 

 suturam linea impressa suiohsolete notaius ; apertura verticalis, margini- 

 hus callo castaneo junctis, margine externa tenui, margine colmnellari 

 incrassato, recto, paululum retrorso, ad hasim subahriipte angulato. 



Long. 4, diam. 2\ mill. 



Hab. Mouth of the Eangoon Eiver. 



I have much j)leasure in naming this beautiful and very distinct spe- 

 cies after its discoverer, Surgeon-Major K. Hungerford, who has lately been 

 most successful in collecting and dredging Mollusca both at Hongkong 

 and the Philippine Islands. The rich chocolate, or chesnut, colour of the 



