Reviews — G. Smith on Anaspidacea. 425 



While urging the necessity of accurate, systematic work, "the 

 field geologist must avoid the opposite extremes of becoming lost in 

 a mass of detail which cannot be represented " on the map. When, 

 however, the author remarks "It requires the same alertness at the 

 end of a long day as at its boginninj? ", we should be inclined to 

 recommend that if alertness begin to fail the geologist should leave 

 intricate ground to make necessary traverses or devote himself to 

 collecting rock-specimens or fossils, or return forthwith to camp. 



There are helpful notes on the uses of various instruments, with 

 mathematical calculations and data for determining thicknesses, 

 depth, and faults; advice is also given on mine surveys and on the 

 collection of rock-specimens, minerals, and fossils. Concerning fossils 

 it is recommended that " All specimens taken from one bed in one 

 locality, though representing many species, should be given the same 

 number and label ". 



A committee is appointed on the United States Geological Survey 

 to deal with geologic names, advising in reference to new terms 

 suggested for stratigraphic divisions, etc. 



In the second portion of this book there are detailed instructions for 

 special investigations on petrologic and chemical subjects, structural 

 geology, glaciers and glacial deposits, and metalliferous deposits, 

 with due regard to both scientific and practical applications. 



We may cordially commend the book to all Government geologists 

 and to those engaged in private economic and other geological 

 field-work. 



IV. — On the Anaspidacea, living and fossil. By Geoffkey 

 Smith. Quarterly Journal of Microscopical Science, vol. liii, 

 pt. iii, May, 1909. 



IN 1907 Mr. Geoffrey Smith, of New College, Oxford, undertook 

 a journey to Tasmania, chiefly for the purpose of investigating 

 the structure and development of the ' Mountain Shrimp ', Anaspides 

 tasmanicB, which is of special interest on account of its relationship to 

 the fossil Syncarida of Palaeozoic rocks. In the present memoir he 

 sets forth the results of his researches and also attempts a review of 

 all that is known regarding the living and fossil Syncarida. Besides 

 adding largely to our knowledge of the internal structure of Anaspides, 

 Mr. Smith discovered, in the ' Great Lake ' of Tasmania, a very 

 interesting new member of the same group, which he names 

 Paranasfides lacustris, so that, with Koommga cursor, described in 

 1907 by Mr. 0. A. Sayce, we now know three living species of 

 Syncarida. This is not the place to discuss the account given of the 

 living forms, but it may be mentioned in passing that the figures of the 

 limbs and moutli -parts are extremely sketchy and that the discussion 

 of their morphology is in manj' respects inadequate ; throughout the 

 descriptions of the thoracic limbs the ischiopodite is termed the 

 propodite, and the statement on p. 502 that an extra thoracic somite 

 "has been supposed to be present in the Euphausiidae " appears to be 

 entirely imaginary. 



Of the fossil forms, the author, we gather, does not profess to have 

 anv first-hand knowledge. This is the more to be regretted since 



