
550 THE AMERICAN NATURALIST. [Vor. XXXVI. 
development, etc. The results have shown what was only at 
first dimly suspected, namely, that the small « buds” were in 
fact not buds at all, but a distinct hydroid, apparently parasitic, 
growing upon the base of the Corymorpha. This was clearly 
demonstrated both from the specific differences which a critical 
study of its morphology showed, and by means of sections made 
through the points of attachment. The point of attachment 
is within a rather limited zone of the base, among the conical 
papillz and filamentous rhizoids of the host, where in some 
cases as many as half a dozen were growing upon the same 
specimen. As will be noted from Figs. 1 
and 2, the new hydroid clearly belongs 
to the genus Tubularia, having the char- 
acteristic form of body, arrangement of 
tentacles, etc. Its attachment to the host 
was quite close, being inserted within the 
filmy perisarc, where its base expanded in 
the form of fingerlike absorbent organs. 
Briefly its characters may be summa- 
rized as follows: Hydranth solitary, from 
2 to 5 mm. in height and about 4 mm. 
in diameter ; tentacles in two whorls, the 
proximal of from eight to sixteen, the 
distal of from five to eight. Gonads 
were found upon but one specimen, and 
in this were immature, but occupying the 
characteristic position among the basal 
tentacles. So far as known, semi-parasitic upon Corymorpha. 
. I propose for it the provisional name Tubularia parasitica, till 
further investigations may be had upon additional and more 
mature specimens, which may further confirm or modify this 
description. 
A New Hydromedusa. — On Aug. 10, 1901, a medusa with dis- 
tinctively sarsian characters was taken in the tow, similar in many 
respects to two species described by Forbes in 1848 (British 
Naked-Eyed Medusz), chief among their features being the pro- 
liferous development of medusze from the body or manubrium of 
the parent medusa. Haeckel likewise described a similar medusa 

Fic. 1. — Tubularia parasitica. 

