98 PROCEEDINGS OF THE AMERICAN ACADEMY. 



age, usually about as long as the distal stalk cell. The appendages, 

 which together with the single stalked perithecia spring in groups 

 of three or four from the distal ends of large cylindrical cells project- 

 ing from the sucker-like receptacle (more rarely arising from the 

 latter directly), are simple or once branched, either sterile or producing 

 the supposed antheridia on short branches near their extremities. 

 Spores very minute, acicular, septate near the middle, 12 X 3 /x. 

 Asci subcylindrical, 40-45 X 7.5 li, eight-spored, the spores sub-dis- 

 tichous. Perithecia 225-290 X 55-75 /*, the stalk cells (longest) 

 425 p, average 375 x 25 p. Appendages 175-375 /* long. Breadth 

 of sucker-like receptacle 75 p. 



On Sunius prolixus Er. Waverly, Mass. 



This form, which is among the most remarkable thus far discoveied, 

 differs from all other genera in the structure of its attachment to the 

 host. It inhabits only the softer chitinous membranes, beneath the 

 elytra and at the bases of the legs or between the segments, which it 

 perforates by the intrusion of its sucker-like base. It is more nearly 

 allied to Compsomyces than to any other known genus. The minute 

 spores are formed in enormous numbers and discharged in masses. 

 The asci arise from a single centre, apparently a single cell, in numer- 

 ous rows, and are distinctly eight-spored. 



TERATOMYCES Thaxter. 



Three additional species of this genus, two of which are described 

 below, represent a well marked type adhering closely to that previ- 

 ously described. The discharge of antherozoids has been observed in 

 fresh material and the antheridia prove to be the beakdike cells 

 characteristic of all the species. The trichogyne has been observed in 

 two species in which it differs widely ; in the one case appearing as a 

 branched organ very similar to the ordinary terminal branches of the 

 appendages, while in the other it is highly developed with peculiarly 

 modified receptive tips. 



Teratomyces Actobii, nov. sp. 



Perithecia one to several, reddish brown distinctly inflated towards 

 the base, the distal portion symmetrically conical, tapering to a blunt 

 apex ; borne on a single short stalk cell not exceeding the appendages 

 in length followed by three unusually large basal cells disposed as in 

 T. mirificus. Receptacle short nearly symmetrical tiuged with 



