340 
MOLLUSCA. BUCCINID.E. 
Momo, 
Gen. MORIO. — Aperture longitudinal, narrow, ending in a 
recurved canal. 
_1. M.c«nWw6f.— Shell pyriform; spire short; volutions depressed, angular, 
with many longitudinal striae, and three nodose ridges (Buccinum nodosum, 
Brander, front. No. 131).— Cassis car. Sower. Min. Conch, t. vi.; the three 
upper London Clay. 
Gen. LXXII. NASA. — Spire produced ; canal very short, 
obliquely truncated. 
308. N. reticulata. — Outer lip simple externally ; the longi- 
tudinal ridges decussated by narrow, deep, spiral grooves. 
Buc. cancellatum. List. Conch, t. Dcccclxvi. f. 21.— B. reticul. lAnn. Syst. 
i. 1204. Penn. Brit. Zool. iv. 122. t. Ixxii. f. 92. Mont. Test. Brit. 
240. — Not uncommon. 
Length an inch and a half ; breadth three quarters ; of a brownish colour ; 
whorls seven or eight, rather flat; aperture lengthened; outer lip nearly 
straight retraliy ; inner lip slightly tuberculated. — This shell is subject to 
slight variations in the relative size of the ribs. 
309. N. incrassata. — Outer lip thickened by a strong exter- 
nal rib ; whorls slightly rounded ; longitudinal ridges decussated 
by narrow flattened spiral ridges. 
Tritonium incrass. Mull. Zool. Dan. Prod. 244, No. 2946.--Buc. minu- 
tum, Penn. Brit. Zool. iv. 122. t, 79 — B. macula, Mont. Test. Brit. 
241. t. viii. f. 4. Near low water-mark, common. 
Length half an inch ; breadth above a quarter ; colour various, mottled ; 
whorls six or seven ; aperture orbicular ; outer lip rounded, denticulated, with 
a short tooth at the junction with the margin of the canal; inner lip concave, 
faintly tuberculated; canal with a black end. Dr Turton notices two varie- 
ties, A having the outer lip thin, and not toothed on the inside, and B “ with 
a notch or cut at the upper angle of the outer lip, separating it from its at- 
tachment to the body volution, similar to that which is found in the Murex 
gracilis.” — Conch- Diet. 15. He has likewise described a very common va- 
riety of this shell, with the pillar white externally, under the title Tritonia vd~ 
ricosa, Zool. Journ. No. vii. 365. t. xiii. f. 7» 
310. N. ambigiia. — Outer lip thickened by a strong external 
rib ; whorls slightly depressed towards the junction ; the longi- 
tudinal ridges decussated by numerous spiral striae. 
Buc. amb. Pult. Dorset. 42. Mont. Test. 242. t. ix. f. 7 — On the Eng- 
lish and Irish coasts, not common. 
Length half an inch, breadth three-eighths ; white, whorls six, with from 
eleven to fifteen ribs ; aperture suborbicular ; outer lip denticulated, with an 
obsolete tooth at the canal ; outer lip wiih two distant folds. 
311. N. cincta. — Outer lip thickened by a strong external 
rib ; whorls nearly even ; interstices of the ribs obsoletely striated 
spirally. 
Buc. cinctum, Mont. Test. 246. t. xv. f. 1. — Found at Weymouth, Mr 
Bryer. 
Length about a quarter of an inch ; white, with a rufous spiral band ; whorls 
