38 Mr. E. A. Smith on Species, of 



Born, in the Mus. Vindobon., first described and figured 

 a. species of Planaxts under the name of Buccinum sulcatum. 

 Deshayes subsequently characterized the same species with 

 the name P. huccinoides (Anim. s. Vert, ed, 2, vol. ix. p. 237), 

 at the time quoting* Born's figure. 



Lamarck, in the Anim. s. Vert. vii. p. 51, described two 

 species, P. sulcata and P. undulata. 



I have carefully compared the figm-es he quotes as repre- 

 senting these species, and also those referred to by Deshayes 

 in the second edition of the above work ; and having also 

 examined a numerous series of specimens, I can arrive at no 

 other conclusions than these, viz. : — 1, that his P. sulcata is a 

 variety of Born's shell (P. huccinoides^ Desh.) with an elongate 

 acuminate spire, with the whorls ornamented with black and 

 white squarish spots about equal in size ; and, 2, that his P. 

 undulata is a shorter, more obtuse form of the same species, 

 with the dark spots flowing into one another, and thus form- 

 ing irregular undulating longitudinal stripes. 



2. Planaxis encausticus. 



P. testa solida ; spira brevis, valde erosa ; anfr. 6 ? ; ultimiis magnus, 

 ad peripheriam obtusatim angulatus, sordide albus, zonis duabus 

 obscuris lurido-fuscis cinctus, altera supra, altera peripheriam 

 infra, et infra suturam macularum nigrescentium serie ornatus, 

 superficie partibus alteris irregulariter brunneo punctatus, trans- 

 versim superne obsolete, basi validiore angustissime sulcatus, 

 incrementi lineis obliquis striatus ; apertura magna, spiram longe 

 superans, testa? longitudinis # sequans ; columella leviter curvata, 

 callo postico magno albo-brunneo ; canalis basalis parum pro- 

 fundus ; labrum margine integro, tenui, nigro-fuscum, superne 

 medioque albo maculatum, intus pallidiore, 8- albido-liratum. 



Long. 20 mill., diam. 12. Coll. Sylvanus Hanley. 



Hab. Aracan {Theobald). 



Of the form, solidity, and size of the short variety of P. 

 sulcatus. It may be known by these peculiarities : — 1, the 

 smoothness of the body-whorl, which has the appearance of 

 being overlaid with a thin white enamel ; 2, the sulci are 

 extremely narrow, merely impressed striae ; 3, the periphery 

 is left white between two obscure Im-id-fuscous bands ; 4, the 

 basal channel is very shallow and partly filled up by a callous 

 deposit. The oblique lines of growth are the vestiges of a 

 thin epidermis. 



3. Planaxis Savignyi. B.M. 

 Planaxis Savignyi, Deshayes, Mag. de Zool. 1844, pi. lOft 



Hab. Red Sea. 



