312 



THAXTER. — MONOGRAPH OF THE LABOULBENIACE^E. 



slightly divergent projections of the anterior lip-cells; the basal cells forming a short, stout stalk, sepa- 

 rated from the stalk-cell by an oblique septum. Appendage relatively small, resembling that of the S. 

 Limosince in general form, the fertile cells not more than five or six in number, the upper ones separated 

 by constrictions which may be obsolete between the lower ones. Receptacle relatively short, the cells 

 subequal, yellowish. Spores about 20 X 2 p. Perithecium: venter 50-55 X 40 p; the neck 90-290 X 

 20 p; the stalk 35-45 X 33-36 p. Appendage, 35-45 p, the stalk-cell 22-30 X 14-17 p. Receptacle 

 55-72 p. Total length to tip of perithecium 400-485 p. A few specimens on the legs much smaller. 



On three small flies of different species allied to Limosina. Ralum, New Pomerania. 



This species may prove a regional variety of *S. Limosince, the appendage, though much smaller, and 

 never well developed, being nevertheless of the same peculiar irregularly proliferous type, not seen in any 

 other species. It differs chiefly in the bulbous venter of its perithecium, which passes distally into the 

 enormously developed elongate neck and tip. 



ARTHRORHYNCHUS Kolenati. 



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, who redescribed it as HelmintJiophana in 1873; since, however absurd 

 and 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 

 determination possible, so that the name given by Peyritsch to the European species of the genus, although 

 undoubtedly a synonym of A. Diesingii Kol. or of A. Westrumbii Kol., or more probably of both, may 

 properly be retained. 



The three species herewith illustrated are all characterized by the possession of a highly developed 

 rhizoidal apparatus, which penetrates the soft body-cavity of the host, and arises from a slightly swollen 

 extension of the basal cell. From this intrusion is produced a mass of copiously branching hyaline fila- 

 ments, which become interlaced in a mass so dense that the course of individual filaments cannot be 

 followed in detail. This condition is barely suggested in Plate XLVI1I, fig. 2, in which a few of the branches 

 are approximately indicated. 



The genus is undoubtedly very closely related to Stigmatomyces, differing in the relative development 

 of the perithecium and receptacle, as well as in its antheridial appendage. The antheridia, although in 

 A. Cyclopodia they are somewhat unilateral, usually assume a more or less distinctly whorled arrangement 

 on the cells of the appendage, as is well illustrated by the two other species. The modifications of the 

 basal and stalk-cells of these appendages in A. Cyclopodia> and A. Eucampsipodce are very peculiar, and 

 the curious thickenings which are also well marked in the basal cell of the appendage proper of some 

 species of Stigmatomyces, are especially noticeable in the first mentioned species. This peculiar structure 

 is perhaps concerned in the partial rotation of the appendage, by which the antheridia become turned 

 away from the perithecium at maturity. As in many species of Stigmatomyces the terminal antheridium 

 is armed with a stout spine. 



There appears to be but a single ascogenic cell in all three species which is very conspicuous, and 

 peculiar from the fact that, as in Moschomyces and a few other genera, it produces the numerous asci 

 which arise from it in several vertical rows, instead of in two, as is more commonly the condition. This 

 is clearly shown in fig. 11, in which a posterior view of the ascus-mass is given r figs. 1 and 7 showing 

 lateral views of similar masses, and their relation to the ascogenic cells. 



Dr. P. Speiser, who has made a specialty of the Nycteribidse, gives a list, in his note on the geographi- 

 cal distribution of the genus HelmintJiophana, of the hosts on which H. Nycteribiw has been observed; 

 but it is evident that at least the three species enumerated below are included in this enumeration. The 

 forms on Cyclopodia macrura Speiser are A. Cyclopodice, the specimens examined by Dr. Speiser and by 



