TIIAXTKU. — 



MONOGRAPH OF TlflO LA HOT! LI! ION I A< I . I , . 



261 



Pkyiutschiella Amazonica Thaxter. Piute XXX, fig. 10. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 427. April, 1900. 



Perithecium translucent brown, about as long as the receptacle, sub-clavate, large, contracted below 

 to form a neck-like base, somewhat inflated distally, the tip well, though not abruptly distinguished, 

 tapering to the nearly truncate apex formed by the slightly expanded tips of the lip-cells w hich are other- 

 wise unmodified. Receptacle rather narrow, pale translucent brown, consisting of a single basal cell 

 followed by three tiers of cells; the lower symmetrical or nearly so, consisting of three long narrow nearly 

 equal cells not appendiculate and not projecting laterally: the middle tier not asymmetrical, consisting 

 of about twelve cells, the series projecting distally on either side, all the cells, except the three larger me- 

 dian and (lie external ones, producing distally short typical appendages, the third cell on the right from 

 the median cell bearing a prominent erect antheridium: the terminal tier very similar to the middle 

 one, consisting of about the same number of cells which produce short typical appendages distally and 

 (in the types) a single nearly median perithecium. Perithecia 200-210 X 36 /i. Receptacle 225 X 

 70 ji. Antheridium 45 [i long. Total length to tip of perithecium about 400 /<. 



On an undetermined staphylinid. British Museum, No. 400, Nanta, Amazon River. 



This and the following species, P. Xanthopygi, should in all probability be united, although none 

 of the numerous specimens of the latter possess the stalked and subclavate perithecia characteristic of 

 the present species, and there are slight differences in the form and structure of the receptacle. Although 

 I do not regard them as distinct, both names are here provisionally retained until more and better mate- 

 rial of the present form can be examined. 



Peyritschiella Xanthopygi Thaxter. Plate XXX, fig. 11. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 29. June, 1901. 



Basal cell of the receptacle very small, or hardly distinguished from the foot: the first tier consisting 

 of three subequal cells without appendages, the middle one somewhat shorter than those on either side 

 of it: the second tier asymmetrical, consisting of three subequal median cells, the margins of the two 

 outer free below for nearly half their length and coincident with the margins of the tier below, the appen- 

 diculate "marginal" cells, about three to five on either side, separated from them as usual by oblique 

 septa; the first on the right bearing the large, slender, pointed, nearly straight purplish antheridium: 

 the upper tier consisting of about fifteen or more cells, the series distally concave, rising abruptly upward 

 on either side above the base of the perithecium and bearing the usual appendages. Perithecium soli- 

 tary at the right of the median (primary) appendage, almost symmetrically inflated from base to apex, 

 dull purplish; the tip slightly darker, hardly distinguished; the apex truncate, sometimes slightly spread- 

 ing; the lip-cells hardly projecting. Perithecia 115-150 X 34-42 p.. Receptacle 200 X 65-70 [i. Total 

 length to tip of perithecium 310-360 fi. 



On the abdomen of Xanthopygus Solshyi Sharp. Sharp Collection, No. 1158. 



A form which is probably not distinct from P. Amazonica, although differing in possessing a stalked 

 and symmetrical perithecium. 



LIMNAIOMYCES Thaxter. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 428. April, 1900. 



Receptacle consisting of two portions, a basal part below the perithecium and a distal part united 

 to its posterior margin; the basal portion consisting of a single basal cell, surmounted by two tiers of 

 cells, the anterior cell of the upper tier giving rise to a compound antheridium in structure similar to 

 that of Peyritschiella: the distal (marginal) portion consisting of an inner and an outer elongated cell, 

 the inner terminating in one of the bell-shaped appendiculate cells characteristic of Chitonomyccs, sepa- 

 rated from the simple appendage by a broad, constricted, blackened septum; the outer, by successive 

 subterminal external proliferations, forming a series of cells from which a smaller secondary appendiculate 

 cell is separated above. The proliferation taking place to the right and left successively, so that the 

 appendages appear to arise in two rows. 



