37 CHAS. W. HARGITT. 



iferous base to others with mere buds of tentacles, with still others 

 having growing tentacles from the base of a definite hydranth 

 on to the fully developed hydroid with full complement of ten- 

 tacles, etc. Fig. i shows the hydroid enlarged ten diameters, 

 while Fig. 2 shows the hydranth greatly enlarged to 

 show the peculiar branching and knobbed tentacles. 

 With this much clear it was not difficult to trace its 

 generic affinities under Cladocoryne, Rotch. 1 But it 

 was doubtful as to its specific relations. Rotch had 

 described a species, C. floccosa, found at Herm, near 

 Guernsey, having a habitat on stones, and being 612 

 mm. in height. Perrier has also described a species, 

 C. simplex, found on Sargassum? but I have not had 

 access to Perrier's book, and so am unable to form 

 any definite notion of that species. 



The present species is very minute, being only 24 mm. in 

 height and differing more or less as to other features. I have 

 suggested for it a varietal distinction, proposing the name sargas- 

 sensis, as indicative of its habitat. The following characters are 

 diagnostic : 



Tropliosome. Stems mostly simple, occasionally branching 

 slightly, rising from a reticulate hydrorhiza. Hydranths rela- 

 tively large, spindle-shaped, with elongated hypostome similar to 

 that of Pennaria. Tentacles about twelve, variously branched 

 and definitely knobbed, and disposed in some three verticels over 

 the body of the hydranth. These tentacles are peculiar and 

 thoroughly distinctive, both in structure and development. A 

 second series of oral tenacles, about six or seven in number, are 

 simple, with knobbed ends, and surround the mouth. All are 

 richly packed with nematocysts. 



The perisarc, both of stem and hydrorhiza, is rather dense and 

 irregularly annulated. 



Gonosome. This is wholly unknown, in the present specimens 

 at any rate. 



Habitat and Distribution. The present is the only time I 

 have seen the species. As stated before it has its habitat on 



1 Ann. Mag. Nat. Hist., March, 1871, Vol. VII., p. 227; Allman, "Gym. 

 Hydroids," p. 38. 



2Cf. Billard, " Exp. Talisman," p. 161. 



