125 



siusculd, striis nb apice radiantibus vumerosis; epidermidejuscd: 

 iong. xVj lai- tV poli. 



Hab. ad Paytam Peruviae, ad Sanctam Elenam, et ad Panamani. 



The concentric lines of growth in this species are crossed by the 

 niimerous strim vvhich radiate from the apex of the upper valve. The 

 under valve, which varies from convexity to flatness, is much the 

 thinnest, and is only marked by the concentric lines. 



Found by Mr. Cuniing at the localities above given, attached to 

 the lower sides of stones in sandy mud at low water, and in some 

 instances at a depth of six fathoms. The remains of the cilia of the 

 branchice give a bearded appearance to the border of the shell in 

 many of the dried specimens, as in Orb. lamellosa. 



Orb. Cumingii approaches nearest to Orb. striata, described by 

 Mr. G. B. Sovverby in the < Transactions of the Linnean Society.' — 

 W. J, B. 



Genus Lingula. 



LiNGULA AuDEBARDii. Ling. testd oblongd, glabrd, corned, 

 pallidejlavd, viridi transversim pictd, limbo anteriore rotundatOf 

 viridi: Iong. 1%, lai. -^-^ po U. 



Hab. ad Insulam Punam. (Bay of Guayaquil.) 



The rounded anterior edge of this shell is green, and the trans- 

 verse lines of that colour are produced by the progressive increase of 

 the shell, which is smoothand parchment-like. In ali the dried spe- 

 cimens the thin anterior edge is contracted into a square form, so 

 as to produce a resemblance to a very square-toed shoe ; but in it$ 

 natūrai statė this edge is rounded. A general contraction, moreover, 

 gives the dried shells a narrovrer and more ventricose character 

 than theyreally possess; and the remains of the cilia of the branchice 

 give to their anterior edges a bearded appearance. 



Mr. Cuming found this species, at about half-tide, in an extensive 

 bottom of hard coarse sand, from four to six inches beIow its sur- 

 face.— W,J. B, 



Lingula Semen. Ling. testd ovato-oblongd, crassiusculd, jdand, 

 albida, Icevissimd, politd, limbo anteriore rotundato : Iong. -j\, 

 tat. T^j. ■poli. 



Hab. ad Insulam Platam Columbiae Occidentalis. 



This shell, the only one I have seen, was dredged by Mr. Cuming 

 in fine coral sand from a depth of seventeen fathoms. It may be a 

 young individual ; but the shell is so much firmer than it usually is 

 in Lingida (so firm, indeed, as not to have contracted at all in dry- 

 ing), that I cannot but look on it as an undescribed species. In size 

 and appearance it bears a near resemblance to a melon seed. 



Mr. Cuming informs me that he found another specimen^ about a 

 line longer, at the šame time and in the šame place, but that he has 

 unfortunately mislaid it. — W. J. B. 



In illustration of Mr. Broderip's paper the Shells described in it 

 were exliibited; as were also drawings of them. They form part of 

 the extensive collection made by Mr. Cuming on the western coast 

 of South America. 



Mr. Owen read a pjiper " On the Anatorny oiih.cBrachiopoda of 



