WS G5 
150 
vel fulvo-zonatd ; spird conicd, acuta ; anfractibus 6, planiusculis, 
suturd profundd junctis, ultimo convexiore, vix descendente ; colu- 
melld brevissimd, basi denticulatad, callum emittente tenuem, vir 
circumscriptum ; aperturd parim obliqud, semiovali ; peristomate 
acuto, subrecto. Operculum tenue, testaceum, carneum, margine 
columellari elevato. 
Diam. maj. 63, min. 53, alt. 5 mill. 
Hab. St. Domingo (Salié). 
3. CONTRIBUTIONS TOWARDS A MonoGRAPH OF THE TRO- 
CHIDA, A FAMILY or GastEROPODOUS MOLLUSCA. 
By Artuur Apams, R.N., F.L.S. etc. 
Genus 1. Trocuvus, Linn.—Pyramidea, sp. Swains. 
1. Trocuus niztoricus, Linn. 
Trochus niloticus, Linn.; Gmel. p. 3565. no. 1 ; Chemn. Conch. v. 
t.167. f.1605, t.168. f.1614.—Trochus marmoratus, Lamk. (young). 
Hab. North Australia (Dring). 
2. Trocuus maximus, Koch. 
Trochus maximus, Koch; Phil. Abbild. Trochus, t. 6. f. 3. 
Hab. 2 
3. Trocuus acuraneutus, Chemn. 
Trochus acutangulus, Chemn. Conch, vy. t. 163.—Trochus conus, 
Gmel. 
Hab. Burias. 
4. Trocuus spinosus, Lamk. 
Trochus spinosus, Lamk. Hist. An. s. Vert. t. vii. p. 
Hab. 2 
5. Trocuus Asperutus, Lamk. 
Trochus asperulus, Lamk. Hist. An. s. Vert. t. vii. p. 22. 
Hab. 2 
6. Trocuus Cuminen, A. Adams. 7. testd turrito-conied, vio- 
laced, maculis viridibus pulcherrimé pictd ; anfractibus planis, 
cingulis, granorum moniliformibus ornatis, inferne nodoso-pli- 
catis, anfractu ultimo angulato, peripherid radiatim nodo-spi- 
nosd, basi concavd, cingulis granulosis, insculptd, centro pro- 
Sunde excavato umbilicum simulante ; columella superné tor- 
tuosd, basi dente terminatd ; aperturd tetragond ; labro intus 
lirato. 
Hab. Sibonga, island of Zebu, under stones at low water (H. C.). 
Mus. Cuming. 
7. Trocuus rastieratus, A. Adams. 1. testd conicd, imper- 
foratd, rubra, maculis albis longitudinalibus variegatd ; an- 
