356 Mr. J. Alder on some new genera and species 



productive capsules on separate short branches near the lower 

 part of the stem on clustered or verticillate pedicles, two or 

 three capsules in linear series on each pedicle. 

 Height I inch. 



Parasitical on Antennularia ramosa, from Embleton Bay, 

 Northumberland, R. Embleton, Esq. 



The peculiarity of this elegant and graceful little zoophyte is 

 that the reproductive capsules are on separate branches from the 

 polypes ; the latter always terminating the upper branches, while 

 the former are on branches near the lower part of the stem. The 

 moniliform mode of arrangement of the capsules on the pedicles 

 is similar to what is seen in E. ramosum, where, however, they 

 are in union with the polypes, arranged round the base of the 

 tentacles. A more near approach to the mode of arrangement 

 in E. capillare may be found in Cavolini^s Sertolara racemosa 

 (Eudendrium racemosum), which has two kinds of reproductive 

 capsules, one set of which are arranged in moniliform series on 

 umbels very closely resembling those of our species. According 

 to Krohn (as quoted by Professor Owen), these capsules, in the 

 Mediterranean species, are found to contain spermatozoa, and 

 this may possibly be the case in the present instance. 



For a knowledge of this new species I am indebted to Mr. 

 Embleton, who kindly sent it to me along with some other very 

 interesting species collected in Embleton Bay. It was fortu- 

 nately preserved in spirits, so that the characters of the animal 

 could be distinctly made out ; otherwise it might readily be taken 

 for a Coryne. 



Family SertulariadaB. 



Sertularia tricuspidata, n. sp. PI. XIII. figs. 1,2. 



Stem slender, alternately branched, twisted at intervals, and 

 jointed above each cell : cells alternate, rather distant, smooth, 

 exactly cylindrical, a little bent outwards, with a three-toothed 

 rim j ovicapsules strongly ribbed across, with a narrow funnel- 

 shaped aperture. 



Height 1 to 2 inches. 



On zoophytes from deep water on the Northumberland coast. 



Without a careful examination of its characters, this species 

 might be passed over as a small variety of S. polyzonias, from 

 which it differs in the slenderness of its proportions, in the shape 

 of the cells, and especially in their three-toothed apertures. 

 Mr. Busk has pointed out to me that there is a species very 

 nearly resembling this found in the South Seas — the S. Johnstoni 

 of Gray, of which he has kindly sent me a specimen from New 



