49 
the basal segment is crescent-shaped, and within its sinus are in- 
cluded the other plates, which are arranged in four longitudinal series ; 
the outer series narrow, the other three wide; the plates of different 
sizes and shapes, with two supplemental plates, one on each side of 
the central row, and at its base; the plates with rough and bristly 
tubercles ; the first joint of abdomen with two round depressions, the 
base of each being coriaceous-like, and furnished with only a few 
small scattered calcareous tubercles; the middle of the hind-edge 
with four tubercles placed in pairs. 
Hab. North America, mouth of the Columbia River; Sir George 
Simpson. In Mus. Brit. 
2 
3. DescripTIONS OF NEW SPECIES OF TURBO, CHIEFLY FROM THE 
COLLECTION oF Hueu Cumine, Esa., F.L.S. By Lovett Reeve, 
F.L.S. ETc. 
Turso Natatensis. Turb. testd viv imperforatd, orbiculari, de- 
pressiusculd, anfractibus spiraliter sulcatis, sulcis regulariter 
concavis latiusculis ; olivaceo-viridescente, rufo radiatim maculatd 
et punctatd, intiis argented ; operculo testaceo, cristato. 
Hab. Port Natal; Wahlberg. 
The operculum of this beautiful species is a tufted mass, like that 
of the T. sarmaticus. 
Turso saxosus. Turb. testd imperforatd, ovatd, spire suturis sub- 
profunde impressis ; anfractibus supern? concavo-declivibus, medio 
angulatis, transversim obscure liratis, tuberculis juxta suturas coro- 
natis, infra nune muticis, nunc tuberculis bi-tri-seriatim armatis, 
laminis subtilibus, longitudinaliter obliquis, peculiariter exsculptis ; 
viridi albimaculatd, intis argented ; operculo testaceo, crasso. 
Hab. West Columbia; Cuming. 
Having observed this species in a private collection, under the _ 
name saxosus, in manuscript, I adopt it, though not a very appropriate 
one, lest it may have been published and escaped my observation. 
‘The rows of tubercles are extremely variable, being even more pro- 
minently developed in specimens of smaller growth than is here re- 
presented. 
Turso Laminirerus. Turd. testé umbilicatd, ovatd, spire suturis 
canaliculatis ; anfractibus subtubulosis, spiraliter costatis, costis 
distantibus, et, cum interstitiis, pulcherrime concentrice laminatis, 
aperturd rotundd ; viridi, nigro longitudinaliter undatd, intis a¥- 
gented. 
Hab. Mouth of the Victoria river, New Holland. 
A very beautifully sculptured species, allied to the 7. Ticaonicus, 
but perfectly distinguished from it, in being of uniformly smaller size, 
more distinctly and remotely ribbed, and in being concentrically 
frilled throughout with a close succession of delicate lamine. 
Turzo murrevs. Turb. testd minutd, suborbiculari, viv umbilicatd, 
levigatd, politd, albd, roseo nitide maculatd. 
Hab. 
A minute, delicately coloured, porcelain shell. 
No. CLXXXIII.—Procrrpines or rue Zoonocica Society. 
