ARTEMIS. 



Species S. (Mus. Cuming.) 



Artemis concentbica. AH. tedd transverse ovatd, la- 

 tiore quam altd, compressd, postice subproducld, con- 

 centrice creberrime mcUo-sulcatd, swlcis vix profundi^, 

 area ligamenti simpUd, lunula cordatd; alid, epuler- 

 mide stramined indutd. 



The concenteic Artemis. Shell transversely ovate, 

 broader than high, compressed, somewhat produced 

 posteriorly, concentrically very closely gi'ooved, 

 gi-ooves not veiy deep, area of the ligament simple, 

 luniile heart-shaped ; white, covered with a straw- 

 coloui-ed epidermis. 



Venus coHceiitrka, Gmelin, Syst. Nat. p. 3286. 



Ilab. Porto Portrero, Central America ; Cuming. 



It is impossible exactly to determine which species 



Gmelin intended for the type of his Vemts concenlrlca ; 



and of succeeding authors, some have figured one for it, 



some another. The shell here represented seems best to 



agree with the figures of Lister and Chemnitz. 



Species 9. (Mus. Cuming.) 



Artemis discus. Art. testa tenidculd, transverse ovatd, 

 postice subquadratd, latiore qiiam altd, valde compressd, 

 concentrice snbtilissime inciso-striatd, Uris intermedils 

 ad latera subobsoleiis et nvmero decrescentibus, area 

 ligamenti mnplici, lunuld rotundato-cordatd ; albidd, 

 fasciis pallide ferrugineis, interdum autem obscure 

 tinctd, epidennide tenni corned itiduid. 



The auoiT Artemis. Shell rather thin, transversely 

 ovate, posteriorly somewhat square, broader tlian 

 high, very compressed, concentrically very finely 

 engraved with stri», intermediate ridges rather ob- 

 solete and decreasing in number at the sides, area 

 of the ligament simple, lunule rotundatcly heart- 

 shaped ; whitish, sometimes, but obscurely, stained 

 with light rust bands, and covered with a thiji horny 

 epidermis. 



Hab. United States. 



This fine species is chiefly distinguished l)y its com- 

 growth and fine sculpture. 



illic divaricatis, ad latera tmmero mnlto decrescentibus, 

 sed corrugatis et lamellaribm, preecipue ad posticum, 

 area ligamenti excavatd, lunuld oblongo-cordatd, pro- 

 fundi impressd; cameo-alid, marginem versus et ad 

 umbones rufescentibiis. 

 The shrivelled Artemis. Shell somewhat squarely 

 orbicidar, thick, compressly convex, concentrically 

 rugosely ridged, ridges here and there divaricate, 

 considerably decreasing in number at the sides, but 

 slirivelled and lamellar, especially at the posterior 

 side, area of the ligament excavated, Imude oblong- 

 cordate, deeply impressed; flesli-whitc, reddish at 

 the umboes and towards the margin. 

 Philipfi, Abbild. und Besch. Conch, vol. iii. p. 23. Cgth. 



pi. 8. f. 1. 

 Hub. New Zealand ; Earl. 



This fine species, which is of rather solid growth, is 

 chietly characterized by the manner in which the con- 

 centric ridges divaricate on the posterior side into com- 

 paratively distant wrinkled lamellae. The brick-red tinge 

 of colouring upon the umboes and towards the margin, 

 is also peculiar. The lunule is rather deeply sunk. 



Species 10. (Mus. Cuming.) 

 Artemis anus. Art. testa suhquadrato-orhiculari, crassd, 

 compresso-convexd, concentrice rugoso-liratd, Uris hie 



Species 11. (Mus. Cuming.) 

 Artemis scalaris. Art. testd suborbiculari, aliqiianto 

 latiore quam altd, concentrice creberrinie liratd, Uris 

 in medio appressis, ad latera angmtioribus, sublamel/a- 

 riius, area ligamenti simplici, lunuld cordatd ; albidd, 

 spadiceo-rufo plus minusve tinctd aid fasciald. 

 The step-ladder Artemis. Shell somewhat orbicular, 

 a little broader than high, concentrically very closely 

 ridged, ridges appressed in the middle, naiTower and 

 somewhat lamellar at the sides, area of the ligament 

 simple, lunule cordate ; whitish, more or less stained 

 and banded with fawn-red. 

 Cylherea scalaris, Meiike, Moll. Nov. Holl. p. 43. no. 341. 

 Eah. Mouth of the Swan River, New Holland. 



The Artemides have so little of colom-, that where it is 

 present it forms a characteristic feature. This beautiful 

 Australian species may be readily known by its peculiar 

 fawn -red colouring, as well as by the an-augement of the 

 concentric ribs, which, instead of becoming less numerous 

 at the sides as in most species, converge together without 

 diminishing in number, by growing narrower, closer, and 

 1 more elevated. 



February, 1850. 



