rnYsosTOxMi. 
99 
author does not adopt the view that the peculiarities of these 
fishes are produced by adaptation to the physical conditions under 
Avhich they are found now-a-days. We have only to go back to 
the time when the region now occupied by the subterranean 
streams was a salt and brackish-water estuary,, inhabited by ma- 
rine forms^ including the brackish -water forms of the Cyprino- 
dontes and their allies (but not descendants) the Heteropygii — 
the families and genera having the characters they now exhibit, 
but most likely more numerously represented than now. As the 
bottom of the basin was gradually more elevated, and the waters 
became confined to narrower limits, and changed from salt to 
fresh, only such species would continue as could survive the 
change; and they were of the type represented by the Hetero- 
pygii. 
Putnam, F. W. Synopsis of the Family Heteropygii. Hep. 
Peab. Ac. 1872, pp. 15-23, pis. I &2. 
The author gives in this paper technical descriptions of the 
four fishes distinguislied by him. The plates are the same as in 
the ^ Amcr. Nat.’ 
ScOMBRESOCIUAi. 
^ Belme. Prof. Caneatrini lias observed a species with vomoriiie teeth in 
tlie Adriatic, which he describes as B. acus (Risso). Fauna d’ltalia, Pesce, 
p. 131. 
STRRNOrTYClIIDyK. 
^ Phosichthijs [lege Bhotichthys'], g. n., Hutton, Fish, of New Zealand, p. 66. 
Body rather elongated, compressed, without scales, but covered with a silvery 
pigment ; a series of phosphorescent spots along the lower side of the body 
and tail ; head compressed, with the bones thin ; cleft of the mouth wide, 
obliquely descending ; maxillary large, produced backward, and receiving the 
intermaxillary in the upper concave part of its margin ; some large teeth in 
both jaws, and a single row of curved teeth on the palatine bones ; pectorals 
small ; dorsal in the centre of the body ; adipose fin small ; anal long ; caudal 
ilividcd into three portions, the central (^le sharp and pointed; branchio- 
stegals numerous ; pseudobranchiac none. — P. argentetts, sp. n., I c. p. 60. 
SALMONIDiE. 
Ills, W. IJcber den Ban dcs Eies ciiiigcr Salrnonidcn. Verli. 
; Ges. Basel, V. 1871, pp. 457-4()l. [On tlie structure of 
; the egg of some Sal monoids.] 
Sahno. Prof. Pavesi is of opinion that the Lake- and River-Trout in the 
Canton Ticino are merely variations of the same species. Pesci nol Ticino, 
pp. 47 et scq. 
f Sahno mlar. “ Pie Flussfischerei in Bdhmen,” by Dr. A. Fritsch 
j (Arch. Landcsdurchforsch. Bohm. ii. 4. Abth. pp. 4(») is a paper of local 
