184 
THE GEOLOGIST 
P. contfttiis, p. YoiDif/ianns, P. spinidosm, P. Jimhnatm, P. arulpatun, and 
P. mc.solohus are also desiderata, and whicli will no doubt turn np sooner or 
later, and thus enable palceoutologists to complete the deseriptions of those 
well marked species. 
Genus Chonetes. Pischer. 1837. 
As the character of the genus or sub-genus will be described under C. Har- 
dirnsiK, we need not in this j)lace do more than to briefly observe that the 
distinctly articulate hinge is the chief character by which Chonetes has been 
separated from Product an ; and that if those shells described by myself in the 
Journal of the Geological Society as Chonetes comoides with strongly articulated 
hinges belong in reality, as supposed by Prof, de Koninck, to P. hemisphmcm 
(Sowerby), or to Produdas at all, the regular articulation or nou-articulatiou 
of the valves could no longer be made use of as a character by which tlic two 
groups could be distinguished. There is also a slight dift'ercnee in the disposi- 
tion of the quadruple impressions of the occlusor nuiscle in the dorsal valve of 
Chonetes, which may claim attention. Chonetes, as well as Productus, possessed 
scattered tubular spines over its external surface ; but the disposition of those 
along the cardinal edge of Chonetes is one of its less important distinguishing 
features. We may also remark that although the general character of Pro- 
ductus is not to possess definite area, fissure, or pseudo-deltidium, these are by 
exception present in some species of the last-named genus. 
A great many so termed species of carboniferous Chonetes have been recorded 
in different works, but which could be most advantageously and properly re- 
duced to a very small number ; and it has appeared to me that palaiontologists 
Jiave often forgotten that the ribs which ornament the species of this genus 
were liable to become coarser or finer, fewer or more numerous, according to 
the specimen or individual, as is the case with species of other genera. 
Rightly or wrongly, I have reduced the Scottish species to two only, 
C. Hardrensis and C. Bnehiana. Prof. Ramsay mentions C. papilionacea, 
Phillips sp., with a point of doubt, as one of the shells he obtained in Arran ; 
but as all my efforts to obtain the sight of a Scottish example of that species 
Lave proved ineffectual, it is probable that the species has not been hitherto 
discovered. 
(To be continued.) 
NOTES AND QUERIES. 
Geology of the Province of Auckland, New Zealand. — The 
following particulars of the geology of Auckland, New Zealand, may be of 
interest to some of our readers. They are condensed from the remarks of Dr. 
P. Hoehstetter, in a lecture delivered to the members of the Auckland 
Mechanics' Institute during the past year ; and are the results of the geological 
survey of those parts of the country which the Doctor has made. 
Having completed liis survey and a geological map of the Auckland district, 
he chose the soutiiern portion of the provhice for his further researches. The 
country there is inhabited almost exclusively by Maories, and has hitherto 
been almost unknown, both topographically and geologically; the northern dis- 
