196 The American Geologist. March, 1891 
♦ 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
Cyclosphceroma trilohatum, — A new fossil Isopod from England. Dr. 
Henry Woodward in the Geological Magazine ( December, 1890) gives a 
most interesting and valuable description of a new isopod from the Great 
Oolite of Great Houghton House, Northampton. The specimen was 
found in the white crystalline limestone and is in a fair state of preser- 
vation. 
Cycxosph-eroma, H. Wood. gen. nov. 
General outline nearly circular, almost as broad as it is long. Cephalon 
rounded and tumid in outline ; eyes moderately large, cornea vitreous ; 
thoracic segments seven in number, broader than head-shield or telson, 
first segment coalesced with cephalon ; segments of abdomen coalesced 
together, but telson apparently distinct. Appendages ? ( imperfectly 
preserved.) 
C. trilohatum is the species here described and figured. The breadth 
of this species is 33 mm. and the greatest length 41 mm. Dr. Woodward 
remarks this as one of the most curious examples of isopods ever seen. 
ZitteVs Handbuch der Palceontologie. The fourth part of vol. iii of 
pala?ozoology has just been received and completes vol. iii. This part 
contains the Reptilia from the seventh order (Crocodilia) and the Aves, 
thus bringing the volume up to the final Vertebrata, the Mammalia. 
The usual completeness of description prevails as has characterized the 
whole of this magnificent work. We have reason to hope that the final 
part will contain a most comprehensive index to the several volumes 
both botanical and zoological thus making the whole work one of in- 
estimable value, or the index might be issued as a separate part and 
form a volume in itself. 
Building Stone in New York. In the Bulletin of the N. Y. State 
Museum ( vol. xii, No. 10) Mr. John C. Smock ( economic geologist to 
the State Museum ) describes the geological position and the geographi- 
cal distribution of the various building stones arranged with reference 
to their geological characters being first divided into crystalline and 
fragmental rocks. Then descriptions are given of the principal quarry 
districts, which are followed by " The use of stones in the cities *' which 
chapter exhibits the great amount and variety of stones used for building 
in any one city : the work then concludes with chapters on "Physical 
and Chemical Tests" and "On the Durability of Building Stones and the 
Causes of Decay.*' The report is accompanied by a well executed map 
of the state showing the various quarry districts and the whole forming 
a most valuable addition to the literature of economic geology. 
Sanguinitc, a nor mineral. In the Mineralogical Magazine (vol. ix, 
