IIG 
CATALOGUE OF THE DIATOMACE^. 
Oil the principle that “ we should not look a gift horse in the 
mouth/’ we ought not to criticise the above work, but as the author 
wishes to be informed of any errors or omissions, we shall take 
the liberty of doing so in reviewing it. 
A Catalogue of the Diatomaceee has long been a desideratum 
with the student of these organisms, and Mr. Habirshaw has done 
good service in preparing this list. I need not say that it is im- 
perfect; the literature of the Diatomaceac is so scattered, that it 
would have been almost impossible to have produced a Catalogue 
free from errors or omissions. The author gives a list of one 
liundred works he has consulted (consisting of over 150 vols.), 
commencing with Muller’s “ Vermuim terrestium,” (1773). 
Professor H. L. Smith in his conspectus gives a list of 302 
genera (Lens, vol. i, pp. 154-157). 
Mr. Habirshaw’s Catalogue contains 330 generic names, a large 
number in both lists being synonyms. (Professor Smith deletes 
above two hundred genera.) 
The following is a list of genera omitted in Smith’s list : — 
Actinogramma. 
Lauderia. 
Porostaurns. 
Actiniscus. 
Lioneis. 
Ealfsia. 
Amphicampa (Raben- 
Libellus. 
Ehabdium. 
horst). 
Mesasterias. 
Scytonema. 
Ardessonia. 
Molleria. 
Stoschia. 
Aristella. 
Maiuema. 
Symbelpharis. 
Auricula. 
Neidium. 
Temachium. 
Brebissonia. 
Perrya. 
Toxosira. 
Dichanieneis. 
Plagiotropis. 
Trigonum. 
Hyalodicta. 
Podiscus. 
Trochiscia. 
Isthmiella. 
Ponticella. 
Genera omitted by Mr. Habershaw : — 
*^Amphitropis. 
Echinaria. 
Syndetocystis. 
*Anomeoneis. 
Hystrix. 
*Suriraya. 
*Dictyocha. 
*Mesocena. 
Syrinx. 
(* Omitted in both lists). 
The genus Amphicampa (Rabenhorst) was constituted by Raben- 
horst to contain certain species of Amphiprora ; he was apparently 
unaware that Ehrenberg has previously published a genus Amphi- 
campa. Rabenhorst afterwards referred his genus to Plagiotropis. 
The genera Actiniscus, Dictyocha and Mesocena are now generally 
acknowledged to be not Diatomaceous, although considered so by 
early observers. Thautoneina should be Thaumatonema. The 
number of specific names in the Catalogue is 6,186. Of the genus 
Navicula 830 names are given, of Actiuocyclus 155 (now reduced 
to six or seven) ; of Eunotia, 173 ; Triceratium, 218 ; Surirella, 221. 
We give the following specimen of the arrangement in the 
Catalogue : — 
Navicula rhomhoides. E. Amer., 3.1, f. 15 ; K. B., p. 94, 28, 
f. 45, 30 f. 44. ; K. S.A.,p. 73; Rab. S. D., p. 38, f. 15 ; S. B. D., 
Vol. i., p. 46, f. 129 ; Vol. ii., p. 90 ; Prat., p. 903, M.S., 1861, 
