18"6.] MR. ALSTON ON NEW SPECIES OF HESPEROMYS. 755 



must be regarded as a variety. Both specimens belong to the 

 collection of Dr. Prevost. 



Cardium ornatum, sp. now (Plate LXXV. fig. 2.) 

 C. testa oblique orbicular/, mediocriter injtata, radiatim costata, 

 latere anlico rotundato, postieo superne levitcr compresso, ob~ 

 tusissime angulato ; eostis 28, elevatis, angulatis, conspicue 

 nodosis, maculis rubris paucis pulcherrime ornatis, ad latera ob- 

 lique sulcatis. 

 Long. 19, lat. 1 7 mill. 

 Hub. Hongkong. 



Shell obliquely orbicular, moderately inflated, radiately ribbed, 

 front side rounded, posterior slightly compressed, and very obtusely 

 angled at the upper part ; ribs twenty-eight in number, elevated, an- 

 gulated, conspicuously noduled, and ornamented with distant red 

 spots ; sides of the ribs obliquely grooved. 



Several specimens of this pretty little species were sent me last 

 year from Hongkong by Mr. Cuthill, the type having passed into 

 the collection of Dr. Prevost. 



EXPLANATION OF PLATE LXXV. 



Fig. 1 a and b. Limn zealandica and var., p. 754. 



2. Cardium ornatum, p. 755. 



3. Conus paulucciee, p. 752. 



4. superscrvptus, p. 753. 



5. baccatus, p. 753. 



6. refleetus, p. 754. 



2. On two new Species of Hesperomys. 

 By Edward R. Alston, F.L.S., F.Z.S., &c. 



[Received November 1, 1876.] 



In examining the Central-American specimens of Muridse in the 

 British Museum I have found two well-marked species which appear 

 to be undescribed. 



Of these, the first was indicated, though not characterized, by the 

 late Dr. Gray, and was exhibited to this Society, along with some 

 other Guatemalan mammals, in June 1843. I have thought it best 

 to retain his name, and would therefore call it: — 



Hesperomys teguina, sp. n. 



Mus teguina, Gray, P. Z. S. 1843, p. 79 (sine descr.). 



Ears moderate, rounded, sparingly clad with fine blackish hairs. 

 Tail short, not longer than the body alone, very minutely annulated 

 and rather thickly covered with fine short dark-brown hairs. Fur 

 close and velvety. Colour of all the upper parts warm dark reddish 

 brown, the fur lead-coloured, with red-brown tips, the longer hairs on 

 the back black ; chin, throat, and breast like the upper parts, but 

 more greyish, the rufous tips of the hairs being shorter ; belly shaded 



