180 



supra rotundatis. Long. 0.5 ; lat. 0.1 poll. Obtained from fishes 

 taken in Massachusetts Bay. 



A thin, globular species, resembling B. diaphana Mont., which has 

 an elevated spire and no umbilicus. 



Bulla [Cylichna] obstricta. T. parva, ovoidea, obstricta, pal- 

 lida ; anfract. 5 ; spira elevata, obtusfi ; sutura duplicate : apertura 

 antice dilatata. Long. 0.2; lat. 0.1 poll. Found at Chelsea Beach, 

 Provincetown, New Bedford, &c. 



Agrees in general with B. obtusa Mont., but the spire is more ele- 

 vated. It is shorter and smoother than B. canaliculata, and has a 

 different suture. 



Limne A chaltbea. [Now regarded as a variety of L. columella 

 Say.] 



Valvata pupoldea. T. parva, castanea, elevata; anfract. ad 

 5, ultima a precedente disjuncta. Long. 0.1 ; lat. 0.075 poll. In- 

 habits Fresh Pond and elsewhere, on stones and submerged sticks. 



Planorbis hirsutus. T. discoidea, utrinque concava ; anfracti- 

 bus 4, lineis hirsutis volventibus insignibus. Lat. 0.2 ; alt. 0.05 poll. 

 Found adhering to sticks in stagnant water, Dorchester, Dedham, 

 Cambridge, &c. 



Natica flava. T. ventricoso-globosa, alba, epidermide tenui 

 flava induta, imperforata ; anfractibus 4 : apertura ampla ; columella 

 flexuosa. Long. 1 ; lat. 0.9 poll. Obtained from the stomachs of 

 fishes. Has a striking resemblance in form to Helix aperta Born. 



Natica canaliculata. [Name preoccupied ; now regarded as 

 a large form of N. Helicoides Johnston, of the north of Europe.] 



Lacuna neritoidea. T. ovato-globosa, tenuis, laevis, epidermide 

 flavescente induta ; anfractibus 3 convexis, ultimo magno ; spira fere 

 nulla : apertura obliqua, semilunaris ; umbilieo amplo, profundo. 

 Long. 1 ; lat. 1 poll. Found on the sands, Chelsea Beach. 



Fusus [Trophon] scalariformis. T. fusiformis, alba vel casta- 

 nea, longitudinaliter 15-20 lamelloso-costata ; cauda longiuscula : 

 apertura ampla, spiram equans ; fauce castanea. Long. 1.75; lat. 

 0.8 poll. Mostly taken from codfish. 



Possibly a very large form of T. clathratus of the North of Europe. 



Fusus tornatus. [I described a shell under this name, believing 

 it to be the true F. despectus of Linneus, and because another shell 

 seemed then to be universally received under that name, in Europe. 

 Forbes and Hanley, coinciding with me, have since rectified the 

 synonymy accordingly.] 



Buccinum [Astyris] rosaceum. T. parva, alba, rosaceo tincta, 



