THE FAUNA OF TllK ST. JOHN GEOUP. 31 



the absence oi' a radiate structure, and, so Jar as can be observed, by tlie a])senee ol' pores on 

 the surlace ; they seem more like the spicules of sponges, many of which have a similar 

 branched form, and hollow core, but their smoothness and great size may seem objections 

 to this view. Tliey differ from the Conodonts of Pander, as described by Owen, in not 

 having "sharp opposite margins," but may be the teeth of some Mollusc or Annelid. 

 Until their structure and allinities are better known, it seems best to place them here. 



EocoiiYNE GEMINUM, n. sp. (Plate V. Figs. 4rt and b.) 



These have two or four (rarely three) conical, ascending, pointed branches or cusps; 

 there is no observed opening either at the base or points. The cusps are in pairs opposite 

 to each other ; the base of the organism is rounded, and the whole surface smooth, and 

 no pores are made visible by an ordinary lens. 



Length, li to 2 mm. 



Horizon aud Loccdity. In the fine shales of Div. I.'', at Hanford Brook, and of Div. \.d, 

 at Porter's Brook, Saint Martin's. 



II.— HYDROZOA. 



DENDROGRAPSUS, Hall. 



Dendrogr.\psus {'.) PRiMORDi.VLis, u. sp. (Plate V. Figs. 5, ba and b.) 



The stem or foot-stalk has a branching root or base ; it is irregularly striate along the 

 sides, and tapers from the root ui)ward. 



The branches are slender, diverge at varying angles, and are usually dichotomously 

 divided and subdivided ; bran chiefs most frequent towards the extremities ; cell markings 

 most distinct on those parts of th(> branchlets which are least subdivided, the branchlets 

 sometimes exhiliit indications of a I'aint alation on each side. 



The cellules appear as knots or undulations along the surface of the brauchlet, usually 

 somewhat further apart than its width, sometimes twice as far apart. The orifice appears 

 as a transverse slit and is not directed upwards ; the branchlet has the appearance of being 

 constricted between the cellules. 



This species appears to be allied to D. HaUianus (Prout), of the Potsdam sandstone, but 

 it is smaller, and the branchlets diverge at a wider angle ; the mouth of the cellule in our 

 species does not have the ascending attitude of those of the species cited. 



Size. The footstalk is about one millimetre wide, and many of the branchlets about 

 one quarter of this width. 



Horizon and Locality. In the fine dark shales of Div. !.</, at Porter's Brook, St. 

 Martin's. Infrequent. 



PROTOGRAPSUS, n. gen. 



Another form which is found in the fine shales of Division 1, has many of the general 

 characters of the Grapolitidie, but does not seem referable to any described genus : it is 



