MELVlLL AND STANDEN : MARINE SHELLS FROM LIVELY ISLAND. 103 



loped margin. P. gaudichaudi Blainv. is a synonym. The var. 

 deaurata is chiefly distinguished from the type by the thin, oblong, 

 depressed shell, showing dark-brown radiating stripes interiorly, and 

 the apex curving forward. Patella cymbularia Del., P. ferruginea 

 Sow., P. delesserti Phil., P. varicosa Rv., and Nacella strigatella 

 Roch. & Mab., are also synonyms. Tryon also considers that P. 

 polaris Marts. & Pfr. is merely a form of P. deaurata, and that 

 P. varicosa Rv. is identical with Woods' & Gmelin's P. flammea. 

 Var. magellanica Gm. is of a rounder form than typical P. ainea, and 

 has a more central, erect, and elevated apex. Variations of this form 

 have been described by Reeve, under the names of P. airame/itosa, 

 P. venosa, and P. c/iiloensis, whilst Rochbr. & Mab. coin many species 

 from it. Both typical P. cenea and the vars. deaurata and magell- 

 anica have hitherto only been recorded from Strait of Magellan. 



Acmsea textilis A. Gd. — Six specimens. This species seems to 

 possess good and distinctive specific characteristics, although in- 

 cluded by Tryon in the synonymy of A. persona Eschz., an exces- 

 sively variable species, which ranges from Sitka to Turtle Bay, Lower 

 California. 



Scurria SCurra (Less.). — A very fine example of this has been 

 added to the collection through the kindness of Prof. D'Arcy Thomp- 

 son. It was collected by Mr. J. Cooper, in 1893, and is of the 

 somewhat depressed terraced form figured by Tryon. 1 The range of 

 this species is given by Tryon as extending from 12 to 41 S. Lat., 

 west coast of South America. Its synonyms are Patella scurra Less., 

 Acmcea scurra D'Orb., Lottia pallida Sow., Lottia conica A. Gd., and 

 Acma^a cymbula Hupe'. 



Naceila cymbularia Lm. — Three specimens, of a pale horn 

 colour, with silvery iridescent interior. Tryon restricts Nacella to 

 one species : N. mytilina Helbl., which lives upon the great seaweeds 

 of the Tierra del Fuego shores, and he includes N. cymbularia 

 amongst its numerous synonyms. 



Chiton (Plaxiphora) setiger King. — One typical example of 

 this well-known South American species. 



Lima falklandica A. Ad. — One perfect specimen, together with 

 odd valves of a very delicate shell with some affinity to L. loscombi 

 Sow. 



Pecten (Pallium) COrneus Sow. — Valves only. The typical 

 form. Recorded from Strait of Magellan. 



P. rufiradiatus Rv. — Many valves, distinctively representative of 

 the species. It is recorded from Strait of Magellan by Reeve, and 

 is a characteristic form of the type of Pecten peculiar to that locality ; 



t Man. Conch., vol. 13, pi. 39, tigs. 26-27. 



