202 
2. A Monocrapn or MacrocuisMaA, A GENUS OF GaAsTEROPO- 
pous MoLLuUscA BELONGING TO THE FAMILY FissuRrEL- 
Lip&. By Artuur Apams, R.N., F.LS. 
Macrocuisma, Swainson. 
Animal? Shell elongated, clypeiform, radiately ribbed, extremities 
elevated ; foramen very large, elongated, placed near the hind part, 
with a groove posteriorly ; the hind margin sinuated. 
1. Macrocuisma Maxima, A. Adams. M. testd oblongd, costis 
parum elevatis subrugosis, striisgue concentricis obsoletis ornaté, 
Susco radiatim maculatd, dorso elevatd, lateribus planutatis, 
extremitate anticd rotundatd; posticd elevatd, subtruncatd ; 
oramen dilatatum, posticé excavatum. 
Hab 2 “ 
ab. -——? 
2. Macrocuisma pizatata, A. Adams. M. testd ovato-oblongd, 
radiatim eostatd, rubra, albo variegatd, utrinque rotundatd, 
lateribus dilatatis ; foramen oblongum, in medio angustatum. 
Hab. 2 
3. MacrocuHIsMA HIATULA, Swainson, Manual of Malacology, 
. 356. 
Spaeaseais macrochisma, Sow. 
M. testd ovato-oblongd, radiatim costellatd, fuscd, subdepressa, 
lateribus concavis, utrinque rotundatd ; foramen magnum, ob- 
longum, postice dilatatum, extremitate postied valde elevatd ; 
margine vie sinuato. 
Hab. 2 
4. Macrocuisma compressa, A. Adams. WM. testd angusté 
oblongd, albidd, roseo radiatim pictd, costellis granulosis striis- 
gue concentricis decussatd, utringue rotundatd, dorso convexd, 
lateribus compressis, in medio inflexis, extremitate posticd valde 
elevatd ; foramen magnum, lanceolatum, postiee dilatatum. 
Hab. -——? 
5. MacrocHIsMA MEGATREMA, A. Adams. MM. testd ovato-ob- 
longd, albidd, roseo radiatim pictd, costellis rugosis striisque 
concentricis sculptd, dorso subelevatd, lateribus planulatis ; 
JSoramen ovato-lanceolatum, permagnum. 
Hab. 2 
6. Macrocuisma cusprpata, A. Adams. M. testd ovato-ob- 
longd, antice angustatd, productd, acuminata, posticé elevatd, 
rotundatd, margine valde undulatd, fuseatd, annulis fuscis con- 
centricis ornatd, lineis elevatis et concentricis cancellatd, circa 
foramen pallidd, extremitate posticd valde elevatd; foramen 
magnum, cuspidatum, postice dilatatum. 
Hab. Cagayan, in insulis Philippinis; H.C. (Mus. Cuming.) 
7. MacrocuismMa propucra, A. Adams. M. testd angusto- 
