MUSEUM OF COMrARATIVE ZOOLOGY. 151 



Megaderma spasma (Plate VI. fig. 1). — The ectoturbinal a minute 

 tubercle, lying above and to outer side of first endoturbinal. The ethrao- 

 turbinals four in number. The first endoturbinal is se})aratcd by a 

 short interval from the remaining two. It is but slightly lobulated, 

 extends as far as the level of the anterior border of the second molar, 

 and is obliquely placed from above downward and from liehind forward. 

 The second and third endoturbinals are parallel, nearly contiguous, the 

 second scarcely exceeding the third in length. The first is lobed for one 

 third its length. 



Nyderis thebalca (Plate VI. fig. 3). — The plates are three in number, 

 one ectoturbinal and two endoturbinal. The first of these answers in 

 position to the nasoturbinal, since it bounds posteriorly the opening 

 leading outward from the nasal chamber. Its frontal surface is fur- 

 nished with a clavate swelling, which is slightly projected as a small 

 lobe. The first and second endoturbinals are smaller than the naso- 

 turbinal, and are so arranged as to permit the second to conceal the 

 third. The latter is, indeed, the only one of the two seen in profile, 

 the former lying between it and tlie nasoturbinal. The first endotur- 

 binal is slender pedunculated, and bears a small bifid lobule. The sec- 

 ond endoturbinal is almost as stout as the nasoturbinal, and its lobule 

 projects forward for a distance equalling one half of the plate itself The 

 lobe is obscurely clavate. 



In the Vespertilionidse the arrangement of the plates is more simple 

 than in the Pteropidie, but more complex than in lUunolophus and the 

 allied genera. 



Vesperus. — The openings of the septoturbinal space are confined to a 

 large foramen placed just in advance of the non-perforate space. Near 

 to the septum, at the anterior portion of the space, is seen a grovip of 

 foramina advancing well to the front. Directly opjwsite the beginning 

 of tliis series to the lateral side is the group of foramina for the first 

 endoturbinal plate, while in front of the latter lie the two foramina 

 for the single ectoturbinal plate. The arrangement is the same in 

 Vespe7')(go. 



Seen from the nasal aspect in Vesperus noctula, the ectoturbinal is two 

 thirds the length of the first endoturbinal. It is thickened above and 

 convolute laterally at the summit, The lateral surface is concave. The 

 entire plate rests on the concave lateral surface of the first endoturbi- 

 nal. The last-named plate is very broad above, and expands laterally 

 and in front of the ectoturbinal. It is narrower at the base than at the 

 tip, where it is prolonged slightly along the median border into a slen- 



