252 



quarters of an inch, its form elliptical, its margin entire, its color 

 grayish yellow. The genus Planocera of Blainville is taken 

 here as including Styloclius of Ehrenberg. 



The following shells from the Exploring Expedition were 

 described by Dr. Gould. 



Erycina (Kell^a) quadrata. Testa parva, tenuis, ventri- 

 cosa, ad angulos rotundata, concentrice et concinne striata, epi- 

 dermide straminea induta ; umbonibus fere medianis, tumidis, 

 anteversis : area cardinalis ampliata, in valva sinistra tridentata 

 (dente mediano subulato, sub umbone sito ; alteris elongatis, com- 

 pressis) in valva dextra bidentata ; fossa ligamentali triangular!, 

 declivi. Long. ^ ; alt. f ; lat. ^ poll. Hah. Feejee Islands } 



This is a very large species of its type, and closely resembles, 

 in size and shape, Cyclas similis. 



Tellina tithonia. Testa transversa, oblonga, subequilat- 

 eralis, zonis et radiis diversis albis et roseis picta, concentrice 

 lirata, liris postice lamellosis ; latere antico semiovali ; latere 

 postico breviori, triangulari, ad apicem truncato ; plica profunda ; 

 margine dorsali recto, declivi ; interior incarnata, ad marginem 

 roseo-maculata, versus apicem lutea ; dentibus lateralibus satis 

 conspicuis. Long. If ; alt. | poll. Hob. Sooloo Sea. 



Intermediate between T. rastellum and T. pulchella, being 

 smaller and of the same shape as the former, but without its 

 peculiar squamous sculpture of the right valve ; and being larger 

 and more roseate than the latter, and from a very different local- 

 ity. It is colored like T. virgata, externally, but is more slender, 

 and deeply colored within also. 



Tellina lauta. T. parva, solidiuscula, oblonga, inequivalvis, 

 umbonibus ad trientem posticalem longitudinis sitis ; latere 

 antico semiovali, margine dorsali recto, latere postico triangulari 

 ad apicem truncato ; valvis concentrice liratis (liris striis 

 obliquis antice decussatis) albis, roseo quadri-radiatis et antice 

 lineis araneosis rosaceis ornatis ; plica inconspicua : cardo den- 

 tibus lateralibus carens. Long, y^ ; alt. -/^ poll. Hab. ? 



About the size, form, and coloring of T. Valtonis, Hanley, 

 which appears to be a polished, pellucid shell, with no peculiarity 

 of sculpture. It is very near to T. rhoinboides^ Quoy, which is 



