478 Reviews — Royal Microscopical Sociefy's Journal. 



their appendages are brought forward at p. 736, vol. i. He finds 

 the ventral membrane, intestinal canal, subcapitular appendages, 

 those of the thorax and pygidium, and the respiratory apparatus. 

 J. D. Dana criticizes these results, and suggests that these are 

 portions of the outer ventral shell, serving as attachments for the 

 thin membranous articulated appendages already attributed to 

 Trilobites. 



S. H. Scudder's remarks on the structure and affinities of Carbon- 

 iferous Myriapoda, to the effect that they cannot be referred to the 

 Biplopoda nor to the Ghilopoda, but should be placed in a new sub- 

 order, for which the name of Archipolypoda is proposed, are to be 

 found at p. 598, vol. i. 



The researches by Messrs. Vine and Shrubsole in fossil Polyzoa 

 (Jurassic and Carboniferous) are noticed at p. 882, vol. i. 



Seguenza's elaborate memoir on the Tertiary Fossils of the 

 Province of Eeggio in Calabria is noticed at p. 594, vol. i. ; and a 

 careful abstract of the Polyzoa (Brj'ozoa) therein described is given. 

 8ome new genera and species, living in the Australian seas, and 

 described by Mr. E. H. MacGillivray, are enumerated at p. 593. 



The valuable results of A. G. Nathorst's investigations of the track- 

 marks of marine and other Invertebrata, and of the natural trailings 

 of aquatic plants, in elucidation of fossil tracks and trails, and of 

 the so-called Fucoids, etc., are given in full abstract (after T. Fuchs) 

 at p. 324, etc., vol. ii. Also his researches on the fossil conditions 

 of MeduscB or Medusoid animals in the same Cambrian strata of 

 Sweden, at vol. ii. p. 326. Notices of these very intei'esting illus- 

 trations of hitherto doubtful Palaeozoic fossils were also given in the 

 Geological Magazine for January, 1882, pages 22 and 24. A 

 noticeable feature in Mr. Nathorst's work is the careful list of all 

 previous memoirs treating of track-marks, — a bibliography of con- 

 siderable extent, but somewhat neglected hitherto. We may remark 

 that in the Portfolios of Drawings in the Library of the Geological 

 Society of London are some original sketches of Crustacean, Mol- 

 luscan, and other tracks by the late Hugh Strickland. 



At p. 394, vol. ii., we have a notice of the conclusion arrived at 

 by Meunier-Chalmas, — namely, that the Eocene genus Ovulites is 

 in his opinion identical with Penicilliis, Link, Nesea, Lamx., and 

 Coralliodendron, Kiitzg., for w^hich he establishes a new section of 

 Siplioneoe, distinguished by their dichotomous branching. One of 

 the Eocene species is said to be closely allied to the existing 

 Mediterranean Coralliodendron mediterraneum. These have been 

 previously regarded as belonging to a group of Protozoa, known as 

 the Daclyloporidce, to which also belongs Triplopoiella, found by 

 Steinmann in a limestone of the Lebanon. 



How far Diatomaceee may serve geologists in recognizing fluviatile 

 and marine deposits, the researches of Dr. F. Bossey on the mud- 

 banks of the Thames give some good indications (p. 94, vol. ii.). 

 Mud taken from seven different localities showed the following 

 proportions of fresh- water and salt-water forms : — 



