Hyatt.] 368 [January 20, 



in length but was not seen entire, nor were the septa visible. The 

 ribs are fold-like as in other species of Caloceras, bent forward and 

 very closely set, the depressions between being merely linear. On 

 the abdomen they fade out to mere lines, and there are no geniculae 

 or external shoulders on the ribs. The specimen, which is about 

 four and a half inches in diameter, appears to be full-grown, and the 

 ribs very rapidly disappear upon the last half of the living chamber 

 as if old age had begun to show itself; the channels also become a 

 trifle shallower. 



Locality, Tingo, near Chacapoyas in Northern Peru, in a com- 

 pact blue limestone. 

 Phylloceras Loscombi Hyatt. 



This occurs also at Tingo, but in a distinct rock, a light pinkish, 

 fine-bedded, argillaceous limestone. The specimen was two inches 

 and a half in diameter but very much crushed upon the surface of 

 the stone. The involution covering nearly the entire side of the 

 whorl, the smooth sides and abdomen and the septal sutures, parts of 

 which were clearly seen, left no doubt, however, that it belonged to the 

 compressed forms of Phylloceras, probably Loscombi. It was asso- 

 ciated with a discoidal ribbed form, about seven eighths of an inch in 

 diameter, too poorly preserved to be identified. This species belongs 

 to the Middle Lias in its lower portion. According to Oppel it is 

 found in the Davoi bed, the Lias y of Quenstedt. 

 Perisphinctes anceps Waagen. 



There are two specimens of this well known species, possessing the 

 usual characteristics of the most unmistakable variety, — that which 

 has the coronate form, with thick prominent spines. One of the 

 specimens is young, a part of the shell in good preservation, and the 

 other is a fragment of a full grown shell, also in good condition. 

 This and the following species show the presence of the highest divi- 

 sion of the Brown Jura, the Kelloway formation of Oppel, the Brown 

 Jura C of Quensted. 



Loc, Compuerta, near Lake Titicaca. 



The filling of the shell is a highly ferruginous limestone, with a 

 small piece of dark blue limestone attached to the exterior, which 

 may possibly represent the orginal matrix. 

 Stephanoceras macrocephalum Waagen. 

 A very good specimen, with sutures, form, and markings unmis- 

 takeably identical with the European form. Filling of the shell 

 dense pinkish limestone, no matrix attached. 

 Locality, Caracolis, Boliva. 



