192 Rev. M.J. Berkeley on some Fungi from St. Domingo. 



ment are close-set and sharp, and sometimes broken into very 

 short waved streaks ; these in some of the specimens are crossed 

 by gently raised lines of an intenser snowy-white than the ge- 

 neral colour, which radiate sparingly from the beaks to the basal 

 margin. 



This delicate species cannot be confounded with any of the 

 minuter bivalves : by its hinge it is essentially a Lepton : the 

 nearest approach to any other species is to the Montacuta biden- 

 tata, which differs in form, colour and fragility, and in having 

 the lateral dentitions almost close together, without the primary 

 teeth between them ; instead of which, there is a minute move- 

 able ossicle, convex on one side and concave on the other, as in 

 the Anatince or Thracia ; this locks into a sloping pit that has 

 sometimes the appearance of being ridged, which is only due to 

 portions of the ruptured ossicle adhering to it ; but in Lepton the 

 primary teeth are persistent or integral parts of each valve. Fresh 

 examples, new facts, and further investigation have all but con- 

 vinced me that L. convexum and L. nitidum are distinct. Our Lep- 

 tons, which I name according to rarity, will stand thus : 1st, L. 

 convexum ; 2nd, L. Clarkm ; 3rd, L. nitidum ; 4th, L. squamosum. 

 I am, Gentlemen, your most obedient servant, 



William Clark. 



XVI. — Enumeration of some Fungi from St. Domingo. 

 By the Rev. M. J. Berkeley, M.A., F.L.S. 



[With a Plate.] 



The Fungi described in the present memoir were collected in 

 St. Domingo by M. Augustus Salle, and were placed in my hands 

 by Mr. Hugh Cuming, from whom sets comprising most of the 

 more interesting species may still be obtained. A good many 

 kinds were represented by solitary specimens, but these, with one 

 or two exceptions, are species which occur very frequently in 

 tropical collections, especially from the neighbouring parts of 

 America. 



1 . Agaricus cepcestipes, Sow. t. 2; Salle, no. 15. On the ground. 

 A single specimen only, which is not in a good state. The gills 

 are not truly remote, but very finely attenuated behind, and the 

 stem is not ventricose, resembling in this particular the variety 

 described in the ' English Flora.' 



2. Agaricus (Pleuropus) catephes, n. s. Pileo horizontali re- 

 niformi translucido glabro postice stipitiformi-attenuato ; lamellis 

 distantibus subdecurrentibus, interstitiis lsevibus. Salle', no. 12. 

 On wood. 



