172 Reviews — Hall and Clarke — Palceozoic Brachiopoda. 



but we have had some correspondence on this matter, and I take it 

 as a compliment that the author can adopt my view. The change 

 means a great deal : it signifies the removal of Witchellia, etc., from 

 the family Rildoceratidce into the family Amaltheidce, sub-family 

 SonniniiKe. 



A notice of this pamphlet would not be complete without 

 mentioning that it contains some interesting remarks about that 

 sexual dimorphism among Ammonites which Prof. Munier-Chalmas 

 has ably discussed.-' The idea, though not novel, is certainly worthy 

 of attention in the form it is now presented to us. I confess, 

 however, to feeling considerable scepticism in the matter, though 

 I have every wish to fully examine the evidence from the author's 

 point of view, so as to do the idea full justice. MM. Munier- 

 Chalmas and Haug evidently do not endorse the saying " cherchez 

 la femme" but believe it to be necessary cherchez le male ; and they 

 think they have found him chez les Amm,onitides. 



In concluding my remarks on this valuable contribution to 

 Ammonite literature, I may note that the plates and many of the 

 septal delineations are done by photography ; and that on the whole 

 the results are good. 



P.S. — Since the above was written I have found that the proof- 

 plate of D. Edouardiana was submitted to Dr. Haug ; and that he 

 agrees with my identification. It may be, of course, that in this 

 matter " second thoughts " ai-e best ; I only mention it to show that 

 I did not rely solely on my own judgment in the identification of a 

 foreign species, but that I took the pains to get my opinion con- 

 firmed by one who is a competent authority. 



le E "V" I IE AAT" S. 



I. — Paleontology of New York, Vol. VIII. Part II. Fascicle 11. 

 An Introduction to the Study of the Genera of the 

 Paleozoic Brachiopoda. By James Hall, assisted by John 

 M. Clarke, Albany, New York, December, 1893. Pp. 177-317, 

 95 Woodcuts. (Charles Van Benthuysen & Sons.) 



THIS is another and welcome instalment of Hall and Clarke's 

 remarkable work on Brachiopoda. It treats of the earliest 

 forms of the Ehynchonelloids, Terebratuloids and Thecidoids, and 

 therefore concludes their valuable generic discussions upon the 

 Palgeozoic Brachiopoda. 



The authors are convinced that the primitive Ehynchonelloids 

 deviated at an early age from the same stock whence Orthis had 

 been derived. They state that the earliest Ehynchonellas of which 

 the internal structure is known are not Ehynchonellas in any true 

 sense (of the type of the Jurassic B. loxia), "but properly connecting 

 morphological phases between Orthis and Bhynchonella — inceptive 

 stages of the fuller development attained in later faunas," 



1 Munier-Chalmas. Sur la possibilite d'admettre uii dimorphisme sexuel chez 

 les Ammoni tides. Compte-rendu sommaire des Seances de la Societe geologique de 

 France, No. 14, p. 172. 1892. 



