15 



apertura angusta, postice acuta ; labro acuto : columella sexpli- 

 cata, plica postrema proximam bis superante ; intus alba. 



Axis If ; greatest diam. f ; length of aperture, 1-^ inch. Re- 

 ceived from Dr. Edmund Ravenel, of Charleston, as from 

 Florida. Another specimen, in the possession of Dr. Jay, was 

 supposed to have come from the Philippine Islands. 



Its characters are intermediate between Mitra and Voluta. It 

 most resembles in form and coloring a small Vol. antiqiiata, but 

 the markings are much more crowded and delicate. 



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

 cosa, valde inequilateralis ; umbonibus tumidis, leviter undulatis, 

 dilute viridibus ; disco olivaceo, vix radiato ; latere antico rotun- 

 dato, superne angulato; latere postico ovato, marginibus arcuatis ; 

 dentibus cardinalibus erectis, lamellatis, fimbriatis ; dentibus 

 lateraHbus, rectis, acutis ; margarita argentata, postice iridescente ; 

 cicatricibus anticis sejunctis. 



Long. 2f ; lat. 1; alt. 1^ poll. From a creek near Lake 

 Monroe, P'lorida ; Dr. Henry Bryant. 



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

 fragile, and the cardinal teeth are more compressed. 



Unio coruscus. T. parva, solida, transverse ovata, ad dor- 

 sum 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. If; alt. |; lat. f poll. River St. John's, near Lake 

 Beresford, Florida ; Dr. Henry Bryant. 



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 ; trossnlus 

 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 lanceolata, concentrice insculpta ; area intermedia uncinata, 

 ad apicem obtusa, apophysi valido intus sufFulta ; area posteriori 



