154 BULLETIN OF THE 



Vespertilionidre. It is directed downward and forward. The first endo- 

 turbinal is as in V. fascus. It reaches a point as far as the canine tooth, 

 is slightly depressed above, and presents a uniformly sloping surface lat- 

 erally. Its lower edge forms the lower border of the median surface. 

 The second endoturbinal is of uniform width, longer than high, and 

 equal in length to the free portion of the first endoturbinal. The third 

 endoturbinal is smaller than the preceding. 



Antrozous imllidm. — The ethmoid bone in this genus closely resem- 

 bles that of other Vespertilionidee. The ectoturbinal is compressed 

 rnedio-laterally. 



Mollosus obscurus. — The ectoturbinal is biconvolute, slightly acu- 

 minate in front, and subequal in length to the mesoturbinal. The endo- 

 turbinal is somewhat broader in front than behind, straight on its median 

 surface, concave on its lateral surface to receive in a measure the ectoturbi- 

 nal. It is apparently without an olfactory plate, which being understood 

 to be present the entire endoturbinal forms a summit thereto with two 

 convolutions which make up the median and lateral surfaces respectively. 

 The concavity thus opening downward receives in part the maxillotur- 

 binal. The second endoturbinal is absent. The third and fourth closely 

 resemble the same plates in the Phyllostomididse, and do not demand 

 any special description. The transverse lamina is apparently absent. 



M. 2'jerotis. — The ectoturbinal is compressed from side to side, and is 

 one half the length of the first endoturbinal. The first endoturbinal is 

 acuminate as it is seen from the median surface, the portion projectimr in 

 advance of the third endoturbinal being slightly convex inferiorly. The 

 third endoturbinal is received in a depression on the lateral surface of 

 the first, the second being absent. It in turn receives the fourth. Both 

 these tui'binals as seen in situ are longer than wide. 



Natalus stramineus. — The ectoturbinal is absent. The second is slen- 

 der and acuminate, the convolutions uniting inferiorly at the anterior 

 two-thhxls. The lower bonier of the free part is straight. The third 

 endoturbinal is globose, and one third the length of free portion of the 

 preceding. The fourth is exceedingly minute, being about one third the 

 length of the third. It is Bomewhat rounded in form. 



TaphozQiw (Plate VI I. fi.L's. 2, 4). — The ectoturbinal somewhat broader 

 than the first endoturbinal, but of the same length. The transverse 

 lamina deeply concave, completely OOnoealing the small maxilloturbinal. 

 The under portion of the free portion of the first endoturbinal is trace- 

 able as far back as the end of the endoturbinal seriea The median as- 

 peel of the concavity nol projected, ai in moat genera, bu< appears ai a 



