156 MATTHEW ON CAMBRIAN 



Horizon and Locality. — Dark grey sandstones of Baud 6' Div. 1, St. John group at 

 Hanford Brook. 



This species in its deep and round A-alves approaches to Obolus in aspect. It is 

 hiro-or than the other Lingulelhc found with it. 



VI.— CEPHAI.OPOI>A. 



VOLBORTHELLA, Schmidt (1888.) 



A number of years ago, Dr. A. Volborth meutioued the occurrence near Reval, in 

 Estland, Russia, of some very small examples of Orthoceras in the " Blue Clay." These 

 have since been found at other localities in the same region, notably at Strietberg and 

 Kunda, but always in the upper layers of the Blue Clay. Dr. F. Schmidt has made a 

 careful study of these peculiar little organisms, the oldest of their kind known, and seems 

 to be fully convinced that they are Orthoceratites. He has recognized a series of closely 

 set partitions, and a narrow, reed-like siphon of about one tenth of the diameter of the shell. 



In the occurrence of this genus in the Cambrian rocks of Southern New Brunswick 

 we are again reminded of the closely similar conditions which accompanied the deposition 

 of the oldest Cambrian measures in Russia and New Brunswick. The organism is found 

 with us in Band b of the upper part of the Basal series, and in the upper part of Band b 

 of Division 1 of the St. John group. It occurs in clusters, as though of a gregareous habit. 

 I do not observe any notable difference of aspect between our examples, and so describe 

 them under the same specific name as the Russian sisecies, the description of which is 

 here reproduced. 



VOLBORTHELL.4 TENUIS, Schmidt. (PI. VIII, figs. 5 a-d.) 

 Memoirs Imp. Acad. Sci. St. Petersburg. Series VII, Vol. XXXVI, No. 2, p. 25, Taf. II, figs. 27-31. 



" Body small, only a few lines long, similar in form to Orthoceras. They are conical, 

 have chambers which are short and conical, arched (downward), drawn forward some- 

 what iu the middle, and perforated for the passage of a slender siphon, which occupies 

 about Tijth of the shell ['s width ?] In the longitudinal section, the siphon is indicated 

 by a hollow reed-like mark, but its shell substance is wanting ; and also on the outside 

 of the body itself all trace of a shell is wanting, although it has retained the appearance 

 of a delicate cross-striation on the outside surface. 



" A living chamber cannot be clearly distinguished, but by washing out the top of 

 the shell a depression appears which corresponds to such a cavity. 



" Although I now can produce no positive evidence against the Orthoceras-like char- 

 acter of these small bodies, still it appears to me that their extreme smallness and their 

 thin shell, which is entirely destroyed, while other fossils as Platysolenites and Olenellus 

 have preserved theirs, establishes a decided generic distinction, which T propose to mark 

 by the name Volborthella, in honor of the discoverer." 



Dr. Schmidt gives the dimensions of a number of what he calls brokeu pieces of the 

 large end of the shell, none of which exceed 5 mm. iu length ; but he figures an example 

 showing the smaller end, which is about 10 mm. long. I have found no specimens of 



