277 



Allied to C. solenoides, Reeve, which is much more elongated, 

 has purplish rays, and is only tinted purple posteriorly, within. 

 C. coralliophaga, Reeve, is somewhat more elongated, more 

 laminated posteriorly, and radiate striate, and the edge only, 

 tinted rose-red within. 



Arthemis labibata. Testa tenuis, cordato-orbicularis, lenti- 

 cularis, sordide alba, radiatim tenuissime striata et liris concin- 

 nis concentricis, postice laminosis insculpta ; natibus sub-media- 

 nis elevatis, acutis, anteversis ; margine dorsali postico declivi, 

 vix arcuato : lunula profunda, lanceolato-cordata : interior albida ; 

 sinu siphonali obliqua, acuta ; cardine dentibus tribus divergen- 

 tibus in utraque valva. Long. 1; alt. y^^; lat. ^ poll. Hab. 

 Bay of Islands. 



A. lincta is more elevated, has the ridges about twice as large, 

 is destitute of radiating striae, is more solid, and has the ligament 

 margin excavated, and the siphonal sinus is narrower and more 

 acute. 



Venus toreuma. Testa ventricosa, subglobosa, vix obliqua, 

 straminea lituris angulatis rufis picta, concentrice porcata ; liris 

 numerosis ad lateros granulosis, acutis, crenulatis ; interstitiis 

 minutissime striatis, et lineolis angulatis pallidis quasi indentatis ; 

 natibus sub-medianis, tumidis, obliquis ; lunula profunda, late 

 cordata : intus pallida ; margine crenulato : cardo validus; dente 

 postico valvse sinistrse longitudinali ; dente antico biramoso. 

 Long. 1| ; alt. 1^ ; lat. y^ poll. Hah. Mangsi. 



In general characters it is allied to V. verrucosa.^ but is more 

 orbicular, more tumid, and its sculpture far more delicate and 

 elaborate, besides being beautifully ornamented with tent-like 

 markings in the intercostal spaces. 



Venus calcarea. Testa ovato-rotundata, alba, crassa, inequi- 

 lateralis, postice subtruncata, striis concentricis, irregularibus, 

 remotis, lamellosis signata ; natibus acutis, attigentibus ; lunula 

 duplici, ovato-lanceolata ; intus candidissima ; margine crenu- 

 lato. Long. 2J- ; alt. 2 ; lat. If poll. Hah. New Zealand. 



Venus rigida. Testa solida, transversa, ovato-ventricosa, 

 inequilateralis, desuper visa acute ovalis, sordide alba, striis con- 



