Mr, Jeffreys on British Mollusca. 43 



the Ciri'hopoda, and Foraminifera ; and there is now a prospect of 

 its being deprived of its right arm, the Brachiopoda : — 



" Singula de nobis anni prsedautur euntes ; 

 Eripuere jocos, Venerem, convivia, luduni ; 

 Tendunt extorquere poemata." 



Terebratula capsula, n. s. PI. II. fig. 7 a, b. 



Testa subeequivalvis, rotundato-ovata, convexiuscnla, lateribus utrin- 

 que compressis, nitida, fulva, punctis tubercuhforniibus, irregu- 

 lariter sparsis, vix confertis, notata ; ahs perbrevibus, rotundatis ; 

 rostris prominuhs ; foramine angusto ; intus-sceleto sen deUidio 

 nullo, in valvula superiore fovea triangulari demissa et dentibus 

 2 laterahbus vaUdis lamelliformibus, in valvula inferiore denticulis 

 2 laterahbus cuspidatis, muuita ; margine integro ; long. J^, lat. 



Several specimens of the very minute Brachiopod noticed in my 

 last paper have since occurred to me ; and I have been thus enabled 

 to ascertain its generic position. By sacrificing some of my speci- 

 mens, 1 have succeeded in examining the interior structure of the 

 shell ; and I am satisfied that it belongs to Terebratulina of D'Or- 

 bigny, or to an allied subgenus of Terebratula, and not to Aryiope. 

 Mr. Norman's shell is of rather a more oval shape than any of my 

 specimens ; but they vary a little in this respect. It caiuiot be mis- 

 taken for the fry of Terebratula capxit-serpentis, which is of a very 

 different shape, and is inequivalve, besides having the peculiar dicho- 

 tomous ribs which distinguish that species, in addition to the tuber- 

 culiform dots. Under a magnifying power of 100 diameters, the 

 inner surface of T. capsula appears to be marked with very fine wave- 

 like lines which converge towards the beaks. This shell being equi- 

 valve or nearly so, it may be a question whether it ought not to be 

 placed in a new subgenus of Terebratula. Mr. Ilvudman sent me 

 this species from Belfast Bay as Aryiope cistellula ; and I have found 

 it in old shells from the same locality, mixed with Aryiope cistellula, 

 which, however, occurs much less frequently there. I also dis- 

 covered both species at Etretat, on the coast of Normandy, on stones 

 which had been taken up in the fishermen's nets at a distance of four 

 leagues from land, and at a depth of about 25 fathoms. 



Argiope cistellula, ii. 361 (Megathyris), and iv. 2.57. I noticed 

 a specimen of this shell, mixed with some of A. Neapolitana, which 

 came from Sardinia ; and I have reason to believe that Philippi con- 

 founded both species in his description and figures of Orthis semi- 

 nulu7)i. I have given in PL II. fig. 8 a, b, a representation of a 

 young specimen of A. cistellula from Guernsey, to show the variation 

 of form to which this species is subject. 



[To be continued.] 



