730 SCIENTIFIC RECORD FOR 1885. 



refers to that of AcUnoceras, and adds a third type of syphon iu a new 

 genus which he calls Choanitoceras, the syphon of which is not ascer- 

 tained, the remains being exclusively those of the hard, unyielding en- 

 dosiphon and sheaths. 



Hyatt, Alpheus. — Structure and Affinities of Beatricea. Proc. A. A. 



A. S., vol. XXXIII, part ii, p. 492. 1885. Salem. 



Abstract. This remarkable fossil has a cellular structure similar to 

 the Foramenifera, and possesses stolons, uniting these cells with each 

 other. 



Hyatt, Alpheus.— [Letter relative to the Pteropods of the Saint John 

 Group.] Bull. Nat. Hist. Soc, New Brunsivick, jS^o. iv, p. 102. 1885. 

 Saint John, New Brunswick. 



States that a certain form is a Ryalothis, allied to H. undulatiis Bar- 

 rande. The aspect of a syphon is due to the compression of the sharper 

 against the flatter side and the form of the sutures, which favors this 

 impression. These fossils with their distinct septa are remarkably similar 

 to certain forms of Nautiloidea, but there is no syphon. They, how- 

 ever, confirm Von Jhernig's and the author's opinion that the Orthocera- 

 tites and Pteropods have had a common, but as yet undiscovered, an- 

 cestor in ancient times. 



Hyatt, Alpheus. — [Letter relative to the Pteropods of the Saint John 

 Group ] Canadian Bee. ScL, vol. i (1884:-'85), p. 141. 1885. Mon- 

 treal. 

 This letter also appeared iu the Bull. Nat. Hist. Soc. New Brunswick^ 



No. IV, p. 102. 1885. Saint John, New Brunswick. 



Hyatt, Alpheus. — Larval Theory of the Origin of Cellular Tissues. 



Proc. Boston Soc. Nat. Hist., vol. xxiii, March 5, 1884, pp. i-iv and 



45-163. (1885. Boston.) 



The hypothesis of the common but independent origin of types is also 

 supported by all collateral evidences. The results of palajoutologic re- 

 search have carried back the origin of distinct types farther and farther 

 every year. It is now established that there was an excessively sud- 

 den appearance of vast numbers of forms in the Cambriam or jjerhaps 

 earlier, as claimed by Prof J. Marcou. The author has applied this 

 specific statement as a generalization to the history of smaller groups 

 of fossils in several branches of the animal kingdom, and in many for- 

 mations, aud has found that the sudden appearance of the smaller 

 groups occurs according to the same law. The early geologic history 

 of animal life, like the early stages of development in the embryo, was 

 a more highly concentrated and accellerated process in evolution than 

 that which occurred at any subsequent period of the earth's history. 

 The great mass of life as shown by the fossils has been progressive, 

 and the progress was similar to that of the individual from a more gen- 



