222 



Unio lepidus. T. transversa, elongato-ovata, tenuis, ventricosa, 

 valde inequilateralis ; umbonibus tumidis, leviter undulatis, dilute 

 viridibus ; disco olivaceo, vis radiato; Latere antico rotundato, superne 

 angulato; later*.' postico ovato, marginibus arcuatis; dentibus cardi- 

 nalibus erectis, lamellatis, fimbriatis; dentibus lateralibus, rectis, 

 acutis; margarita argentata, postice iridescente ; cicatricibus anticis 

 sejun 



Long. 2| ; lat. 1 ; alt. H poll. From a creek near Lake Munroe, 

 Florida; Dr. Henri/ Bryant. 



Very closely allied to U. trossulus, Loa, but is larger, more fragile, 

 and the cardinal teeth are more compressed. 



Unio coruscus. T. parva, solida, transverse ovata, ad dorsum 

 lata, deorsum cuneata ; umbonibus anticis valde erosis; latere antico 

 rotundato; latere postico acuminato; margine dorsali valde declivi ; 

 margine ventrali lente" arcuato; epidermide piceo, nitente ; dentibus 

 cardinalibus obliquis, validis ; dentibus lateralibus curtis, rectis; 

 cicatricibus anticis sejunctis ; margarita vivide cupreo-purpurea. 

 Long. 1| ; alt. % ; lat. f poll. River St. John's, near Lake Beresford, 

 Florida ; Dr. Henry Bryan'. 



Of the same type as U. Buckleyi, and might be thought the young ; 

 but it is more solid, less angular, is much darker colored, has a much 

 more brilliant nacre and a stronger hinge ; trossulus is less cuneate 

 and has a white nacre, as has also U. Brumbyanus. 



Teredo thoracites. T. magna, solida, subequilateralis, alba ; 

 valvis trilobatis ; area anteriori maxima, antice truncata, obtuse lan- 

 ceolata, concentrice insculpta ; area intermedia, uncinata, ad apicem 

 obtusa., apophysi valido intus sufFulta; area posteriori minima, lunata, 

 superne emarginata, incrassata : tuberculis cardinalibus magnis, 

 uncinatis ; apophysi subumbonali compresso, geniculato ; ossicula 

 siphonali pulpito mediano instructa, altero latere subulato, altero 

 ligulato. 



Length and height, 1 inch; breadth, f inch. Tavoy, British 

 Burmah. Rev. /•'. Mason and Rev. J. Benjamin. 



In size and solidity this exceeds anj species yet described. It is 

 chiefly characterized by the great size of the anterior area when 

 compared with the posterior ; the stilt-like form and great length of 

 the pallets is also quite peculiar. 



