1881.]. Recent Mollusca during the year 188o. 7It 
and a variety of it; Z. hystricina, same locality ; Adalaria pacifica 
and A. virescens, Unalashka; Acanthodoris cerulescens, Bering 
sea; Zhemistv (Palio) pallida, Aleutians; and Triopha modesta, 
Shumagin islands, Alaska. For the last (at first referred to 
Triopa) the genus Z7iopha is proposed, and Colga is suggested 
for the group typified by Doris lacera Abildgaard (I. c. p. 112). 
Brooks (Proc. B. S. Nat. Hist. xx, pp. 325-9) contributes a 
paper on “ The development of the digestive tract in Mollusks,” 
in which he records his views of the leading points in the devel- 
ment of pulmonates and of the oyster from the observa- 
tions given in detail in the subsequently published memoirs on 
the fresh-water Pulmonates and on the oyster, elsewhere re- 
ferred to. 
In the Annals of the N. Y. Academy of Sciences, 1, No. If, 
PP. 355-362, pl. xiv, xv, Mr. W. G. Binney continues his valuable 
investigations and notes on land shells of the United States, and 
on some exotic species. The following new species are described: 
Macrocyclis hemphillii ( Olympia, Or.) ; Zonittes rugeli; Z. andrewsi ; 
and Mesoden andrews, from Roan mountain, N. C., collected by 
Mrs. Andrews. Notes on the anatomy and dentition as well as 
the synonymy of species already known, make up the balance of 
the paper. The genus 7ebennophorus is now first reported from 
the Amazon, three hundred miles inland from Para, Brazil. 
In the Bull. Mus. Comp. Zoology (v1, No. 3, Feb., 1880) the 
fifth report on the Blake dredgings in the Gulf of Mexico, com- 
prises “General conclusions from a preliminary examination of 
the Mollusca,” by W. H. Dall (pp. 85-93). The material con- 
Sidered embraced four hundred and sixty-two species of ninety- 
Six genera (this term being liberally construed), ranging from a 
few fathoms to 1920 fathoms. A comparative table of the genera 
and number of species of the littoral and abyssal Gulf fauna is 
given, together with illustrations of the range of individual spe- 
cies, showing that many range from thirty fathoms to over eight 
hundred fathoms, a fact which had never been clearly indicated 
before, as most of the deep sea expeditions avoided carrying 
their investigations continuously from the abyssal into the littoral 
region. Pteropods and pelagic surface forms are not considered. 
The general conclusions are as follows: 1. The fact, already 
known, that certain species have a limited vertical range, forming 
respectively a littoral and an abyssal fauna, is supplemented by 
i 
