408 PROCEEDINGS OF THE AMERICAN ACADEMY. 



the lateral aud like them bluntly rounded. Receptacle consisting of two 

 small cells, the lower twice as large as the upper, which gives rise distally 

 to the stalk-cell and bears the free appendage laterally; the foot an 

 unmodified cell which penetrates the host, dividing below into a very 

 copiously branched system of slender, sinuous, rhizoidal hyphae. Ap- 

 pendage consisting of a dumbbell-shaped, free stalk-cell, the basal half- 

 rounded or flattened, brownish, somewhat larger than the distal portion, 

 which is deeper brown, flattened and inflated, connected by a narrow 

 liyaline isthmus (the lumen of which may become almost obliterated) with 

 the lower half, and mostly broader than the base of the basal cell of the 

 appendage, which is infertile, subrectangular, or somewhat inflated, slightly 

 longer than broad, the lower half of the walls becoming conspicuously 

 modified by a progressive thickening from above downward, the thick- 

 ened portion deeper brown ; the remaining cells of the appendage three 

 to four in number, brownish, successively smaller from below upward, 

 giving the organ a characteristically tapering habit ; the two lowest of 

 these cells usually relatively shorter, and bearing each three to four 

 antheridia side by side, distally and externally ; those above relatively 

 longer aud narrower and producing fewer antheridia, the terminal one 

 spiniferous. Antheridia with slender curved necks. Spores 60-65 X 

 4.5 //. Perithecium : venter 325-350 X 70-90 yu, ; the stalk-cell 220- 

 250 X 75-80 /x. Appendage, 100-1 10 /x, the stalk-cell 35-40 X 30-35 /a 

 (the upper half X 28-30 /x). Receptacle 55-75 X 45-50 ^. 



On the abdomen of Oyclopodia macrura Speiser. New Pomerania. 

 Berlin Museum, No. 854. 



The original name given to this genus in 1857 by Kolenati is here 

 retained in preference to the much later one applied to it by Peyritsch 

 in 1873 ; since however absurd aud scientifically worthless the original 

 zoological descriptions of these forms may be, there has never been the 

 slightest question as to the generic identity of the organisms studied by 

 these two authors. Neither the descriptions nor the figures given by 

 Kolenati and Diesing are, however, sufficient to render a specific deter- 

 mination possible, so that the name given by Peyritsch to the European 

 species of the genus, although it is undoubtedly a synonym of A. D'le- 

 singii Kol. or A. Westrimibii Kol., or more probably of both, may 

 properly be retained. The new forms here described are very closely 

 allied, diifering chiefly in the details of structure in the appendage and 

 the tip of the perithecium, but are very different from Arthrorhynchus 

 Nycteribeae. Material in my possession obtained from species of Nyc- 

 teribia, from Europe, must, I think, be referred without (question to the 



