LEPAS ANSERIFERA. 81 



account the variation in the carina and upper part of the 

 terga, this species is not always readily distinguished 

 from L. anatifera, without opening the valves and looking 

 for the right-hand tooth of the latter. In fresh specimens, 

 the orange ring at the top of the peduncle, and the broad 

 purplish interspace between the carina and other valves, 

 are characteristic. In all states, the filamentary append- 

 ages offer a good character. 



3. LEPAS ANSERIFERA. PI. I, fig. 4. 



L. ansekifeea. Limitetis. Syst. Naturae, 1707. 



Anatifa stkiata. Brug. Encyclop. Meth. (des vers), PL clxvi, 



fig- 3. 

 Pentalasmis dilatata \ (young). Leach. Tuckey's Congo 



Expedit.,p. 413, 1818. 

 Anatifa sessilis (?). Quoy et Gaimard. Voyage de 1' Astrolabe, 



PL xciii, fig. 31. 

 Lepas nauta* Macgillivray : Edin. New Phil. Journ., 



vol. xxxviii, p. 300. 

 Pentalasmis anseejferus. Brown. Illust. Conch., 1841, PL li, 



fiff.l. 



■*o* 



L. valvis approximatis leviter sulcatis (tergis prcecipue) ; 

 scuto dextro dente forti interno wnbonali, Icevo aut dente 

 exiguo, aut merd crista instrncto ; margine occludente 

 arcuato, prominente: pedunculi parte superior e aurantiacd. 



Valves approximate, slightly furrowed, especially the 

 terga ; right-hand scutum with a strong internal umbonal 

 tooth; left-hand with a small tooth, or mere ridge; 

 occludent margin arched, protuberant : uppermost part of 

 peduncle orange-coloured. 



* Professor Macgillivray does not consider the species, which he has 

 described under L. nauta, and which I cannot doubt is the same with the 

 present species, as the L. anserifera of Linnseus ; but I find it so named in 

 all old collections, and it seems to agree very well with Linnaeus's descrip- 

 tion. There has been much groundless confusion about this species ; I have 

 no hesitation in giving A. striata, of Brugiere, as a synonym, though I have 

 received from Paris the Lepas pecti?iata of this volume, named as the 

 A. striata; and on the other hand, Poli has incorrectly called a common variety 

 of L. pectinata by the name of L. anserifera. 



6 



