Acmcea.] GASTROPODA. 65 



3. Acmaea roseoradiata, Suter, 1907. Plate 5, fig. 8. 



Acmcea roseoradiata, Suter, P. Mai. S., vii, 1907, 317, pi. 27, f. 9, 10. 



Shell very small, oval, conical, with broad pinkish radiate rays. 

 The sculpture, which only a good lens will reveal, consists of 20 very 

 indistinct low riblets on the lower half of the shell, each bordering 

 one of the pinkish rays ; upper half with about twice the number 

 of microscopic subobsolete radiate striae. The colour of the upper 

 half is light pinkish-brown, of the lower part white, with 10 broad 

 radiate pinkish rays, unequally distanced. Apex sharply pointed, 

 very little in front of the centre. Inside with the central area pinkish, 

 slightly lighter coloured in the middle ; border rayed like the outside, 

 margin sharp. 



Length, 3-5 mm. ; breadth, 2*5 mm. ; height, 1-5 mm. 



The dentition is unknown. 



Type in my collection. 



Hob. The type is from 18 fathoms, Port Pegasus, Stewart Island 

 (Captain Bollons) ; Dusky Sound, 30 fathoms (R. Henry) ; Tau- 

 maki Island, west coast of the South Island, in 10 fathoms (Captain 

 Bollons) ; Snares, in 50 fathoms (Captain Bollons). 



Remark. This pretty little shell is well characterized, and quite 

 distinct from all the other known New Zealand species of the genus. 



4. Acmaea rubiginosa, Hutton, 1873. Plate 5, fig. 9. 



Fissurella rubiginosa, Hutton, C.M.M., 42. Glyphis rubiginosa, Hutt., Man. 

 Conch. (1), xii, 216. Acmcea lacunosa. Reeve : Suter, T.N.Z.I., xxxiv, 

 218, not of Reeve. A. rubiginosa, Hutton : Suter, P. Mai. S., vii, 1907, 

 315, pi. 27, f. 1. 2 ; Iredale, T.N.Z.I., xl, 376. 



Shell oval, conoidal, white or light rufous, ribbed. The radiating 

 ribs are very distinct, rounded, their number variable ; there are from 

 10 to 20 ribs extending from the apex to the margin, besides a num- 

 ber of shorter interstitial ribs, but the total number does not generally 

 exceed 30. The encircling growth-lines are fine, and close together. 

 Colour rufous, with the ribs white ; dead shells are pure-white, the 

 apex brown. The apex is usually situate at the anterior third, some- 

 times a little nearer the centre ; it is small, and has the aspect of a 

 callosity filling up a fissurelloid perforation. Inside porcellanous, 

 white, with radiating pinkish rays, corresponding to the interspaces 

 between the ribs. Central area more or less clouded with brown, 

 margin slightly crenate. 



Length, 18 mm. ; breadth, 13 mm. ; height, 6 mm. 



The dentition is unknown, but is most likely the same as in 

 A. cingulata. 



Type in the Dominion Museum, Wellington. 



Hob. Chatham Islands (type) ; near Taumaki Island, west coast 

 of the South Island, in 10 fathoms (Captain Bollons) ; Bay of Islands ; 

 Lyttelton ; Shag Point (Iredale). 



3 Moll. N.Z. 



