Geology and Natural History. 145 
Seven plates in good lithography are filled with dissections of 
flow = systematic views and criticisms appear to be thor- 
nd, G 
13. Attman, G. J.: A Monograph of the Gymnoblastie or Tu- 
bulurian Hydroids. Parts I, Il. Ray Society, 1872.—The Ray 
Society has recently issued the second part of Allman’s Monograph 
of the Tubularians. Prof. Allman, as is well known, has been 
occupied for many years in working up this group of animals, and 
~ monograph he now publishes is a truly magnificent produc- 
“on, illustrated with beautifully engraved plates, by Wagenschei- 
ber rlin, and numerous wood-cuts. t well as they are 
engraved, they owe their excellence to the fidelity and beauty of 
the drawings of Prof, Allman, who has himself drawn from life 
the exquisite forms which his facile pencil has given us with such 
— accuracy. His skill as a draughtsman is well known 
ology, and 1 
idea, the classification proposed by Allman in 1860, in his “ Con- 
Struction and limitation of genera among Hydroids,” is adopted, 
With such modification as subsequent researches have rendered 
