On African and S.-American Otters. 387 



Joseph * points out the distinctions of this species from 

 0. nerjlecta, A. Schneiiler, in his detailed description of that 

 form, wliich has eighteen anal papillae besides the two larger 

 ventral cirri. 



5. On the same Groups dredqed in Norwegian Waters and 

 in Finmark hy Canon Norman. 



Both Ophelia limacina, II. R., Ammotn/nane aulogaster, 

 II. R., and the widely distributed Trnvisiaforhesii, J ohmiowy 

 are not uncommon in the fiords. Moreover, the finest example 

 of the second comes from Finmark. Ammotrypane ( Ophellna) 

 cy/indricaudatus, Hansen, likewise occurs in the same fiords 

 near 15ergen. ScaliJiregma inflatum, H. R., is often dredged 

 in the same seas, but all the examples are small, especially in 

 contrast with the large specimens from Lochmaddy, North 

 IJist. No example of the Telethuste is present, the absence 

 of these littoral annelids being due to the fact that dredging 

 alone was resorted to, and this in water of considerable depth. 



EXPLANATION OF PLATE XVIL f 



Fiij. \. Ophelia radiata, Delle Chiaje, in profile. Enlarged under a lens. 

 Fiy. 2. Anterior end from the dorsum, to show the acutely conical snout 



and the ridges of the skin. Enlarged under a lens. 

 Fig. 3. Caudal processes from the dorsum. Enlarged under a lens. 

 Fuj. 4. Caudal processes from the ventral aurface. Similarly enlarged. 



LXIII. — On certain African and S.-Americnn Otters. 

 ^y Oldfield Thomas. 



SixCK I wrote my paper on the arrangement of the otters in 

 iSSy Xy opinion has changed as to the value of the characters 

 which should justify generic distinction between different 

 ^^roujis, and I am now prepared to admit, with other authors, 

 that the clawless otters {Aony.v) and the margined-tailed otter 

 of Brazil {Pteronura) should be recognized as generically 

 different from the ordinary otters of the genus Lufra. The 

 two species of Aonyx, A. capensis and cinereaf widely different 



* Ann. Sc. Nat. 8' s^r. t. v. p. 369, pi. xxi. figs. 181-195, and pi. xxii. 

 figs. 19G-199. 



t I am indebted to the courtesy of the Carnegie Trust for the figures 

 on this Plate. 



1 P. Z. S. 1889, p. 19(). 



