560 Reviews — Geological Sm^vey — 



fiom the Trenton, Utiea, Lorraine, and liichmond groups of various 

 North American localities, comprising specimens referred to Z,. James i, 

 permits one to accept L. suecicus as a distinct species. Not only 

 is it actually of greater dimensions, as Professor Moberg says, but 

 the height of the plates relative to their width is greater ; and 

 L. jamesi, which is perhaps nearest to it in this respect, has the 

 lines of growth more prominent. Professor Moberg has been unable 

 to find in Z. suecicus " any trace of the peculiar fine sculpture 

 between the growth-lines, which according to Huedemann charac- 

 terises Z./amesz". The fine striae at right angles to the growth-lines, 

 ending on them in slight beads, just as described by K.uedemann, are 

 visible in our specimens of L. suecicus (I 16U20, I 16022). Dr. J. M. 

 Clarke's description of L. sarlei and other species {^Amer. Geol., 

 vol. xvii, p. 137, 1896 ) suggests that the plates merely abut on the 

 middle (so-called dorsal) line, and that they alternate ; but an. 

 excellent specimen from the Trenton group of Minnesota (I 7245), 

 very like L. sarlei, shows distinct overlapping with very slight or 

 no alternation. 



The mutual relationships of Lepidocoleus, Turrilepas, and Phimulites 

 are still obscure, and the Swedish fossils throw no further light 

 on them. We have indeed still much to learn as to the mere 

 structure of these skeletons before we can so much as say what 

 relations they bore to the rest of the animal. Tip to the present 

 the main reason for referring them to the Cirripedia seems to be 

 the difficulty of placing them anywhere else. 



On the last page Professor Moberg figures two markings in the 



Black Trinucleus Shales of Ullnas, which he believes to represent 



plates of a Cjstid, one of the Rhombifera. His figure 1 certainly 



supports that interpretation. Since, however. Professor Moberg paid 



me the compliment of submitting these specimens for my opinion, 



I am entitled to say that the specimen itself is by no means of 



such regular appearance, and that neither it nor the original of fig. 2 



are accepted by me as echinodermal. My own interpretation, given 



while still ignorant of the fact that Phimulites occurred in these 



beds, was that fig. 1 might represent one or more kite-shaped 



plates of that genus. Professor Moberg, however, rejects that 



interpretation with as much decision as 1 reject his. And so the 



matter rests. -p, . -r, 



J^ . A. Bather. 



YIII. — British Cahbonifekods Prodtjgti. 

 Memoirs of the Geological Survey of England and Wales. 



PALiEONTOLOGT, Vol. i, pt. iv. ThE BrITISH CARBONIFEROUS 



Producti. I. Genera Pustula and Overtonia. By Ivor Thomas, 

 D.Sc, Ph.D. 4to; pp. 168, with 4 plates. London: Dulau & Co., 

 1914. Price 6s. 



rpHE recent great revival of interest in the fauna of the Carboniferous, 

 I due to the researches of Vaughan, Sibly, Dixon, and others, has 



impressed on the author of the present work the necessity for a careful 



revision of the Producti, which form one of the most important 



groups of fossils in the Carboniferous rocks. 



