414 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Patinella Dall. Foot witli a scalloped frill iuterrupted only in front; 

 gills as in Patella. 3 /2-1-1-3) 3 ' 



Nacella Sclinmacher. Foot frilled ; gills very small in front ; shell pecu- 

 liar; lateral teeth all bidentate. /oi ~ io\ q * 



B. Branchial cordon interrupted in front. 

 a. Sides of foot smooth. Heleion. 

 Helcion Montfort. Third laterals posterior, bidentate. _ . 



HelcionisGus Dall. First laterals anterior. 5 /o o\ q - 



Patina Gray. Third laterals posterior, denticulate; shell peculiar. 







3^^^2^1) 3* 

 ******* 



Metoptoma Phillips. Posterior edge emarginate or waved. 



Fossil in Carboniferous of Great Britain. 



January 22, 1882. 



ox TW^O KECEIVT AOJOITIOIVS TO THE IVOKTH AmERICAIV BIRD- 



FAUi^A, BY I>. BEI.I>Ii\«. 



By KOBERT KIDGW^AY. 



1. Motacilla ocularis, Swinhoe. (Ibis, 1860, p. 55). 



This species, which is the common East-Asiatic species, has been 

 taken at La Paz, Lower California, by Mr. Belding, who secured a 

 single adult sj)ecimen in winter plumage, on the 0th of January, 1882. 

 It was undoubtedly a straggler, but it seems incredible that it could 

 have found its way there across the broad expanse of the Pacific Ocean, 

 On the other hand, it is difficult to conceive by what other means it 

 could have reached a locality so far from its natural habitat, not being 

 known from any part of the Pacific coast of North America, even in 

 Alaska, although specimens have been obtained at Plover Bay, Siberia. 

 In eastern Asia it occurs in winter as far south as Amoy, where it was 

 first discovered by Mr. Swinhoe. 



This species much rcvsembles M. alba of Europe, having like it a gray 

 back, but differing in having a large white patch covering both rows 

 of wing-coverts, and in having a distinct post-ocular streak of black, 

 running into the black of the occiput. 



2. Dendrceca vieilloti bryanti, Ridgway. 



{Dendroica vieiUoti Yur. hrijanti RlDGW. Am. Na,t.,vii, 1873, p. 606; B. B. & R., 

 Hist. N. Am. B., i, 1874, \i. 218.— Dcndraca ricUhii Salvin & Godman, Biol, 

 Ceiitr.-Am. Aves, i, 1879, 125, part.) 



This species, described originally from Yucatan, Honduras, and Ma- 

 zatlan, was found to be quite common at La Paz, in January, 1882, by 



