129 
Hab. San Blas, west coast of Mexico. From eleven fathoms, 
among mud. 
In this species the lacinie of the varix take root near the centre 
of the interspace, whence they proceed directly forwards. They are 
of a squarish compressed shape, and are partially divided in their 
middle by an impressed line. 
Murex preritus. Mur. testd subrhomboided, albidd, multivaricosé ; 
anfractibus septenis, supern? angulatis et fuscis, ultimo elongato 
in canalem attenuato, transversim striatis ; varicibus senis tenuibus, 
laciniatis, antic? inter lacinias seriebus duabus eleganter crenatis ; 
laciniis acuminatis, uncinatis, gradatim minoribus ; aperturd ob- 
ovatd ; canali aperto, ad basin subrecurvo. Axis 9J lin. 
Hab. Bay of Madalena, California. From seven fathoms, on a 
sandy floor. 
Mr. Bridges on the habits, &c. of some of the smaller species of 
Chilian Rodents. 
“« Mus longicaudatus, Bennett.—I found this mouse in the valley 
of Quillota, fourteen leagues distant from Valparaiso, in the vicinity 
of brooks and rivulets, amongst weeds and long grass, although from 
its appearance I should imagine it seldom takes the water. In that 
part of Chile it is not rare, but it cannot be considered a common 
species. In the province of Colchagua I have found another species 
approaching M. longicaudatus and more abundant, differing slightly 
in the length of its tail, and in being somewhat less in size. At first 
sight the two species are liable to be confounded. Probably this is 
the same species mentioned in p. 40 of the ‘ Zool. of the Voyage of 
the Beagle’ by Mr. Darwin as being so numerous in the province of 
Concepcion. 
‘« Mus longipilis—W aterh.., ‘ Voy. of the Beagle,’ —inhabits the pro- 
vinces of Aconcagua, Valparaiso and Colchagua. Its favourite haunts 
are the hedges made of bushes of Mimosa Cavenia and Trevoa tri- 
nervis, also other shrubs used indiscriminately for that purpose. It is 
necessary to explain that the hedges of the fields of Chile are renewed 
every year by throwing on each side of them new layers of bushes, 
and that they are frequently two or three yards across, forming thus 
a mass of decomposing wood, which gives excellent shelter for the 
numerous small Rodents inhabiting that country, which is so rich in 
this interesting group. The Mus Jongipilis is without a native name 
to distinguish it from the other species found in Chile. All the small 
species belonging to different families are known and called by the 
natives by the name of Llaucha, pronounced Yaw-cha, a term in 
the language of the Auracarian Indians signifying a mouse, and this 
name is current in the present day in the parts of the country occu- 
pied by the descendants of the Spaniards. The general term applied 
to the large species is ‘ Ratones.’ There is a species found near 
the town of Quillota, fourteen leagues distant from Valparaiso, and 
probably not yet known to naturalists, called ‘ Pericote.’ This 
animal lives in common in the caves with Octodon Cumingii. 
«* Myopotamus Coypus, Auct.,—Mus Coypus, Molina,—inhabits the 
