414: Analytical Notices of Books. 



three rows of depressed scales." Inhabits Turk's Island. Total 

 length two feet four inches ; length of the tail, one foot three 

 inches. 2. C. teres. " Teeth small, uniform and pointed; 

 dorsal crest wanting only over the sacrum ; scales on the sides, 

 thighs, and legs, bristled over with minute spines; tail cylin- 

 drical, tapering gradually towards the point; spiny rings en- 

 circling the tail, separated by two rows of depressed scales with- 

 out spines above; spines on the rings nearly equal, extending to 

 the end of the tail." From Tampico. Total length one foot 

 eight inches and a half; length of the tail eleven inches. 



In Ichthyology there occur two articles ; one being a " De- 

 scription of a new species of Fish of the Linnean genus Perca^ by 

 J. Gilliams," which he refers to the genus Scolopsis of Cuvier, and 

 describes by the trivial name of S ay anus ; and the other being 

 " Descriptions of several species of the Linnean genus Rata, of 

 North America, by Mr. C. A. Lesueur." In this latter are de- 

 scribed three species of Rata, Cuv. the il. Desmarestia, R.eglan- 

 iieruy and R.Chante7iay : one of Trygon^ Adans., the T, sabinaj 

 one of Myliobatisy Dum. the M. Freminvillii ; . Sind one of 

 CephalojJiera, the C. giorna. 



In recent Concliology there is only an incidental notice con- 

 tained in the " Account of some of the Fossil Shells of Maryland, 

 by T. Say." In this the industrious author points out the neces- 

 sity for establishing a new genus under the name of Dispotoea, 

 which is thus characterized : " Shell univalve, conoidal, patelli- 

 form, with an internal entire cup-shaped appendage, adhering by 

 its side and apex to the side of the shell." Its type is a recent 

 species from South America, described by Mr. Say as D. iubiferUy 

 but which appears to be identical witii the cup-and-saucer limpet, 

 as it is termed by the dealers, the Calyptrcea am'iculata, Chemn. 

 and C. extinctorium ? of Sowerby's Genera, a shell which Mr. Say 

 does not seem to have been previously acquainted with. The 

 other species which he refers to it are, D. grandis, fossil, ovate, 

 concentrically wrinkled, and destitute of spines or processes; and 

 D. costata, previously described by him as a Calyptrcea. 



The continuation by the same gentleman of his " Descriptions 

 of Coleopterous Insects collected in the late expedition io the 



