390 Scientific Proceedings of the 



■^^ of an inch. Inhabits Massachusetts Bay. Taken from a fish's 

 stomach taken off Race Point, and resembles B. lignaria in min- 

 iature. 



Bulla hiemalis. B. testa perparva, hyalina, globosa, convoluta, 

 longitudiiialiter tenue striata, spira nulla, apertura ad basim valde dila- 

 tata. Length j'g- of an inch, breadth about the same. Inhabits Mas- 

 sachusetts Bay. 



Bulla Gouldii. B. testa parva, ovata, convoluta, fragili, alba, 

 transversim tenue striata, spira depressa, imperforata, interdum pro- 

 minula, anfractibus quatuor, superne rotundatis, suturis impressis, 

 apertura supra angusta, versus basim dilatata, columella arcuata. 

 Length ii, diameter /„ of an inch, nearly. Inhabits Massachusetts 

 Bay. In size and shape much like B. insculpta, Totten, but is 

 smoother, more solid and not umbilicated. Often the outer volution 

 forms an elevated, rounded ridge, encircling and rising above the 

 others. 



Pleurotoma decussata. p. testa parvula, ovali, fusiformi, al- 

 bida, anfractibus quinque convexis, longitudinaliter plicatis, trans- 

 verse striis frequentibus tenuibus decussatis, apertura elongato-ovali, 

 basi sub-canaliculata, labro tenui, lagvi, superne indentato, columella 

 nitida, depressa arcuata, ad basim sinistrorsum divergens. Opercu- 

 lum rudis. Length -^g, diameter ■^\ of an inch. Inhabits Massachu- 

 setts Bay. Distinguished from Fusus harpularius by its color, the 

 greater convexity of the whorls, and the angular sinus at the junction 

 of the lip. 



Anculotus dentatus. a. testa rotundata vel sub-conica, irregu- 

 lari, olivaceo-nigrescente ; anfractibus quinque, ultimo magno, ventri- 

 coso, ssepe fasciis duobus aut tribus radiis cincto ; suturis impressis, 

 spira obtusa plerumque erosa ; apertura erosa, basi effusa ; columella 

 atra arcuata, depressa, ad basim unidentata, poslice excavata, intus vi- 

 rido vel fusco-albescente. Operculo corneo, unguiculato. Length 

 J-^, diameter |^ inch. Inhabits the rapids of the river Potomac, Va. 



Greatly resembles A. monodontoides, Conrad, but is distinguished by 

 the peculiar flattening of its purple columella, the remarkable fossa in the 

 umbilical region, and its more obtuse tooth situated nearer the base. 



Dr. T. W. Harris, made some remarks on the difficulties met with by 

 himself and others in the study of Botany, on account of the want of strict 

 accuracy in our books. Thus, in Bige ovv's Florula, Vaccinium is placed 

 in Octseandria, while all our species are invariably 10-androus, and are so 

 arranged in all more recent works. Menyanthus has the stigma trifid 

 oftener than bifid, and sometimes quadrifid. Cheledonium, which belongs 

 to Polyandria, has only 8 to 12 stamens; while Cratagus, which belongs 

 to 20-andria, is found with only 10 stamens. 



