390 DE. H. li. JAMESON ON THE [Apr. 16, 



It seems to be most nearly related to M. vulgaris, but the higne 

 is shorter and the posterior " auric4e " less proaouneed. 



The lappet-Uke processes of the lip are short, strong, and 

 rounded. 



External colouring greyish or greenish brown with dark radial 

 markings. The inside of the lip is coloured much as in M. margari- 

 tifem. The general plan of marking is very much the same as in 

 M. vulgaris, but thei'e is an entire absence of the reddish tints so 

 characteristic of that species. 



Species 25. Margaeitieeea pernoides. 



Avicula permides, Eeeve, 1857, sp. 31; no loe. Type in B.M. 



Species 26. Makgaritifeea PANASES^aE, n. sp. (Text-fig. 94.) 



? Avicula mamlata, Gould, 1850, p. 309 ; Tutilla, Samoa (pifeocc). 



Avicula inca, Gould, 1852 (for A. maculata, Gould), p. 443, 

 pi. 39. fig. 549 (prajocc. Philippi, 1849, p. 21). 



Not Avicula i^ica, Gould, Eeeve, 1857, sp. 71, 



Type B. M. No. 1901.3.25.2, Conflict Atoll, British New Guinea ; 

 coll. H. Lyster Jameson. 



(Panasesa, native name of chief island of Conflict Atoll ; also 

 used collectively to denote the entire Atoll.) 



Without an opportunity of examining Gould's type, it is 

 impossible to say what shell he had before him. His figure and 

 description strongly suggest the present species. 



Text-fio-. 94. 



Margardifera panasesce, nat. size. 



Shell somewhat convex, inequivalve, shghtly obUque ; rostrum 

 distnictly marked off from surface of nacre internally by a sharp 

 ridge. Form as in M. vulgaris, but with less pronounced posterior 

 aurick: Teeth as in M. vulgaris. Lip-processes shorter, more 

 rounded, and relatively thicker, with no trace of the dark and light 

 cu'cumferential or transverse markings so tvpical of the lip- 



