Beddard) the funnels of the pronephridia disappear except in the genital segments, where they seem to be actually converted into the genital funnels.
In the genital segments of Eudrilus the nephridia are present, but the funnels have not been found though they are obvious in other segments.
They pass out through short vasa deferentia with internal ciliated funnels, sometimes an enlargement on their course - the seminal vesicles - and a minute external pore situated on the side of the tail.
40); in Geryonia, however, it remains double, and the centripetal canals arise by parting of the two layers; (4) excretory endoderm, lining pores at the margin of the umbrella, occurring in certain Leptomedusae as socalled " marginal tubercles," opening, on the one hand, into the ring-canal and, on the other hand, to the exterior by " marginal funnels," which debouch into the sub-umbral cavity above the velum.
The portion of Carniola belonging to the Karst region presents a great number of caves, subterranean streams, funnels and similar phenomena.