114 PEOCEEDIXGS OF THE ACADEMY OF [Jan., 



14 mm.; width in middle 12 mm.; length of meropodite 13 mm. 

 (Ko. 10,095 "Wagner Free Institute of Science, collected at Cross- 

 wicks, N. J., by Dr. Thomas H, ^Montgomery, Jr.). 



I.ower ]Marl beds of New Jersey, Lenola (C. W. Johnson, 

 Louis Woolman, H, C. Borden); Crosswicks (Dr. Thomas H. 

 Montgomery, Jr.); Tinton Falls, Monmouth county (Coll. A. N. 

 S. ). Also Delaware, deep cut of the Delaware and Chesapeake 

 canal (Coll. A. N. S.). Types in Coll. A. N. S. 



What Callianassa faujasi is in Europe to the Ma^strichtien, C. 

 mortonl is on this side of the Atlantic to the " Lower Marl " beds. 

 It is an abundant species, known by remains of over one hundred 

 individuals, chiefly the propodites only, though sometimes the 

 meropodite, carpopodite and propodite are preserved in place; 

 when this is the case, it is usually due to their being more 

 or less imbedded in hard nodules. The abrupt deflection of the 

 hind margin of the more convex face of the propodite, and the 

 downward bend, posteriorly, of its uj^per margin (as in fig. 3) 

 are characteristic of the species. 



Both chelie of a Lenola individual preserved in one nodule show 

 the right claw to be somewhat the larger. Otherwise the two 

 -claws seem to be counterparts. I can find no other difference. 



The largest specimens show a shallow, vermiculate wrinkling of 

 the surface, but the smaller are almost smooth to the eye or touch. 

 The crenulation of the margins becomes stronger with age, and is 

 'Occasionally lost or obscured by chipping of the edges. 



It is named for Samuel George Morton, one of the earliest 

 explorers of the American Cretaceous. 

 Callianassa conradi n. sj). ri. I, figs. 8, 9, lo. 



Propodite rhombic, its length (without finger) not much exceed- 

 ing the width, somewhat more convex on the outer than on the 

 inner face, the posterior margin neither abruptly nor deeply dejiexed. 

 Surface smoothish, with some small tubercles on each side of 

 the slight excavations on both sides .of the hand near the com- 

 missure between the bases of the tingers; the acute lateral edges 

 <;renulated, as in C. moHoni, l)ut the lower edge is not deflexed 

 posteriorly as in that species. Fixed finger triangular in section, 

 the angles crenulated, the flat grasping face with a short smooth 

 rib near the base, which joins the keel along the outer angle of the 

 finger. 



