GASTEROPODA 177 



Family FISSURELLIDAE 

 Genus Zeidora, A. Adams, i860 

 Type (by monotypy): Zeidora calceolina, A. Adams, i860. Straits of Korea in 63 fathoms 

 Zeidora maoria, n.sp. (Plate XLVIII, figs. 9, 10). 



Shell small, long and narrow; back broadly arched, beak obliquely incurved. Anal 

 fasciole well marked but shallow, extending full length of the dorsal surface of shell. 

 Slit extending in from the margin for about one-fourth the length of shell. Sculpture 

 very fine and delicate, minutely latticed with closely spaced concentric lirae, crossed by 

 dense divaricating radials. The radials are more closely spaced than the concentric 

 lirae, which results in the rectangular interspaces being twice as long as they are broad. 

 Internal shelf well developed (broken in holotype), and extending for more than one- 

 third the length of the shell ; edge of shelf concave, slightly flattened medially. Edges of 

 the shell minutely crenulated. Colour white. 



Length 2-9 mm. ; breadth 1-4 mm. ; height 0-9 mm. (Holotype). 



Habitat: Off Three Kings Islands, St. 933, 260 m. 



This adds another genus to the New Zealand fauna. The species is allied to the 

 Australian Z. tasmanica, Beddome, 1883, but is more elongate; in fact it more closely 

 resembles Z. naufraga, Watson (Challenger Reports, Z00L, xv, pi. 4, fig. 3) from off 

 Culebra Island, West Indies, in 390 fathoms. The main difference is in the sculpture, 

 the interstices of the reticulate ribbing being square in the West Indian species and 

 oblong in the New Zealand one. 



Genus Puncturella, Lowe, 1827 

 Type : Patella noachina, Linn 

 Puncturella manawatawhia, n.sp. (Plate XLVIII, figs. 7, 8). 



Shell minute, conical, oval with somewhat flattened sides, thin. Fissure roughly 

 diamond-shaped, almost central, with the characteristic spiral incurved apex immedi- 

 ately behind and inclined to the right. Surface sculptured with about twenty-four 

 radial series of minute deciduous triangularly projecting scales. Both slopes straight, 

 anterior a little shorter. Interior with a typical straight-edged septum half covering the 

 fissure. Colour dull white. 



Length 1-5 mm.; breadth 1-15 mm.; height o-8 mm. (Holotype). 



Habitat: Off Three Kings Islands, St. 933, 260 m. 



The only other New Zealand species are demissa, Hedley, 1904, which differs in 

 having the summit near to the posterior end and the surface practically smooth, and 

 Hedley 's record (1916, Anst. Antarctic Exped., Zool. iv, pt. 1, p. 37) of Puncturella 

 analoga, Martens, from 60 fathoms off the south end of Macquarie Island. 



Iredale (1924, Proc. Linn. Soc. N.S.W., xlix, p. 221) proposed Vacerra for the New 



