181 



conico-acuta ; anfractibus 6 plano-convcxis, spiraliter lincolatis : 

 apertura spira brevior ; columella arcuata, planulata. Long. 0.3 ; 

 lat. 0.15 poll. From fish caught in Massachusetts Bay. 



REPORT ON THE INVERTEBRATA OF MASSACHU- 

 SETTS. 8vo. Cambridge, 1841. 



Astakte quadrans. T. ovato-triangularis, obliqua, compressa, 

 levis, epidermide flavo-olivacea induta ; umbonibus vix postrnedianis 

 erectis, acutis ; lunula laneeolatii ; intus lactea ; margine interiori 

 simplici ; dente laterali satis conspicuo. Long. 0.4 -f- ; alt. 0.4 ; lat. 

 0.1 poll. 



From the stomachs of fish in Boston Harbor and elsewhere. 



This small, smooth, quadrant-shaped shell, with its evident lateral 

 tooth, is well characterized. 



Astarte undata. T. elongato-ovata, postice acuta, inequilater- 

 alis, undulis concentricis profundis circiter 15 insculpta, epidermide 

 flavo-viridi induta. Long. 1.3; alt. 0.9. Found occasionally in 

 Massachusetts Bay, but more commonly at the eastward. 



[This species was indicated, but not formally described, and has 

 since been recognised by conchologists.] 



Venus [Tapes] fluctuosa. T. ovata, lenticularis, inequilater- 

 alis, alba, undulis concentricis reflexis 20-25 disco insculpta, epider- 

 mide tenui, nitida, straminea induta ; umbonibus parvis ; lunula 

 cordata, polita ; extremitatibus obtusis. Long. 0.8; alt. 0.6; lat. 0.2 

 poll. From fishes' stomachs. 



[This is evidently a more northern shell. A specimen from the 

 sea of Ochotsck measures an inch and a half in length by an inch in 

 height. It is V. astartoides Beck (1849). ] 



Nucula [Yoldia] sapotilla. T. elongato-ovata, sub-equilater- 

 alis, subrostrata, epidermide flavo-viridi nitida induta ; margine pos- 

 tero-ventrali flexuosa ; denticulis utroque 16-18. Long. 1.2; 'alt. 0.8; 

 lat. 0.3 poll. Inhabits Massachusetts Bay generally. 



Nucula [Leda] Jacksonii. T. calcarea, ovata, postice angustata 

 demum adscendens et truncata, ventricosa, concentrice lirata ; um- 

 bonibus ad trientem anteriorem positis; denticulis anticis 15, posticis 

 20. Long. 1 ; alt. 0.5 -f ; lat. 0.4 poll. Found at the land-slip at 

 Pride's Bridge, near Portland. 



[This is a fossil species, and though it has not as yet been found 

 recent on the Atlantic shores, it is at least very similar to L. pernula 

 of the Scandinavian coast.] 



