N I S . 



Genus NISO, Eisso. 



Testa subi<lata,pyraiiiidalu, m ii It isjji rails, varicibus lineari- 

 bus; axi perforaio, apertard aiigulatd; labro simplice, 

 acuto ; umbiUco ad apicem exleiiso ; operciilo paiici- 

 spirali. 



Shell subulate, pyramidal, uiany-wliorled, with linear va- 

 rices ; axis perforated, aperture angular; outer lip 

 simple, acute ; umbilicus reaching to the apex ; oper- 

 culum paucispiral. 



Tiie nine species composing this genus are distinguished 

 from the shells of Eidima by the umbilical perforation of 

 the axis and the acuminated lower termination of the 

 aperture. 



Species 1. (Mus. Cuming.) 



Niso S.^NDViCHENSls. Nis. testd paron, alba, breoi, so- 

 lidd ; aiifractu ultimo laio, aiiijulalo ; mubilico parvo, 

 roluudu, aperlnrd infra acutissiiiid. 



The Sandwich Island Niso. Shell small, white, short, 

 solid; the last whorl broad, angular; umbilicus 

 small, round, aperture very acute at the base. 



SOWEUBY. 



Iliib. Sandwich Islands. 



Species 2. (Mus. Cuming.) 



Niso goniostoma. Nis. testd solidd, pi/ramidali, ob- 

 longd, pullidi filled, late fiisco fasciatd ; anfractihns 

 nmnerosis, brevibus ; iimbilico viediucri, aperturd rhom- 

 boided. 



The angle-mouthed Niso. Shell solid, pyramidal, 

 oblong, pale-fawn, with a wide brown band ; whorls 

 numerous, short ; umbilicus middle-sized, aperture 

 rhomboidal. 



A. Adams, Sowerby's Thesaurus, Niso, sp. 6. pi. 170. f. 1. 



llab. Island of Bureas, Philippines ; H. Cuming. 



Species 3. (Mus. Cuming.) 



Niso I.MBRICATA. Nis. testd acuminata, pyramidali, at- 

 bidu, longilitdiiialiter rubra lineutd ; anfractibns medio 



subexcavalis, infra anr/iitatis, proininentibns ; ninbilico 

 parvo, apertard autici: ancjulatd. 



The imbricated Niso. Shell acuminated, pvramidal, 

 whitish, longitudinally lineated with red ; whorls ex- 

 cavated in the middle, angular and prominent be- 

 neath ; umbilicus small, aperture angular in front. 



SowEKBY, Eulima, Pro. Zool. Soc. 1834. 



llab. St. Eleua ; in sandy mud, from six to eight fathoms. 



The whorls in this pretty little shell are elegantly taper- 

 ing upwards, and swelled near the suture. 



Species 4. (.Mus. Cuming.) 



Niso TEREBELLA. Nis. iestd solidd, fused ; anfractibns 

 numerosis, brevibus, paulo coiivexis, ultimo sabrotnndo ; 

 iimbilicu carinato, aperturd acuminata. 



Toe little auger Niso. Shell solid, brown; whorls 

 numerous, short, a little convex, the last rather 

 round ; umbilicus keeled, aperture acuminated. 



Chemnitz, Turbo, Conch. 10. t. 165. f. 1593, 3. 

 Helix terebellata, Broch. 



llab. Nicobar Island. 



Species 5. (Mus. Cuming.) 



Niso marmorata. Nis. testd solidd, ventricosd, albidd, 

 brunneo marmoratd; anfractibns convexinscntis, ultimo 

 rotunda, aperturd breviusculd. 



The marbled Niso. Shell solid, very ventrieose, whit- 

 ish, marbled with brown ; whorls rather convex, the 

 last rounded, umbUieus wide, aperture rather short. 



SowERBY (Eulima), Conchological lllu>tralions. 



Hub. Philippine Islands; II. Cuming. 



Species 6. (Mus. Cuming.) 



Niso caNDIDULa. Nis. testa late p!jrainid(.u, alba, so- 

 lid a; anfractibus brevibus, convexiusculis, ultimo ro- 

 tunda ; umbilico mediacri, columelld arcuatd, acu- 

 minata. 



The white Niso. Shell widely pyramidal, white, solid; 



May, 1866. 



