502 GASTROPODA. [Pectinibranchia. 



axial riblets, faint on the shoulder and obsolete towards the base, 

 about 15 on the last whorl, the interstices slightly broader than the 

 riblets, adorned with numerous hair-like growth-lines ; crossed by 

 faint spirals, that upon the keel stronger than the others, spire-whorls 

 with 2 spirals below the first, body-whorl with 4 to 5 spirals, three 

 of them above the aperture, the interspaces with very fine microscopic 

 spiral lines. Colour white, somewhat vitreous. Spire conic, gradate, 

 with a blunt apex, of about the same height as the aperture ; base 

 finely spirally striate. Protoconch rather large, papillate, smooth, of 

 1^ whorls. Whorls 44, distinctly and broadly shouldered, the angle 

 near the middle of the whorls, straight and somewhat receding below 

 the angle ; base contracted. Suture well marked, narrowly margined 

 below. Aperture narrowly pyriform, angled above, produced below r 

 into an oblique short and open canal, truncated at its base. Outer 

 lip thin and sharp, angled above, slightly concave and then contracted 

 below, with a shallow sinus below the suture. Columclla vertical, 

 slightly arcuate, turned to the left toward the canal, slightly excavated 

 on meeting the straight parietal wall. Inner lip thin and narrow, 

 smooth. 



Diameter, 3 mm. ; height, 5 mm. 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hob. Off Great Barrier Island, in 110 fathoms. 



10. Mangilia protensa, Button, 1885. Plate 22, fig. 5. 



Daphnella protensa, Hutt., T.N.Z.I., xvii, 1884 (1885). 317. Pleurotoma 

 protensa, Hutt., Plioc. M., 49, pi. 6, f. 25. Daphnella protensa, Hutt. : 

 Suter, T.N.Z.I., xxxi, 76 ; Index, 71 ; Murdoch and Suter, T.N.Z.L, 

 xxxviii, 282. Pleurotoma (Drillia) awnmoaensis, Hutt., T.N.Z.L, xv, 

 131. Drillia aicinitoaensis, Hutt., Man. Conch. (1), vi, 208, pi. 12, f. 25 ; 

 not of C. Tert. M., 1873. Drillia (?) amcena, E. A. Smith, A.M.N.H. 

 (5), xiv, 1884, 318; Hutton, P.L.S. N.S.W., x, 116; Suter, T.N.Z.L, 

 xxxi, 66 ; J. Mai., xii, 73. Pleurotoma amoena, Smith : Watson, Chall. 

 Rep., xv, 305. 



Shell fusiform, elongated, turreted, thin and fragile, lightly axially 

 costate and spirally lirate. Sculpture consisting of subequidistant fine 

 axial riblets, obsolete on the shoulder and below the periphery of the 

 last whorl, 15 to 20 on the body-whorl, the interstices of about the 

 same width or slightly broader than the riblets ; crossed and reticulated 

 by fine spiral threads, 3 very fine and close together on the shoulder, 

 5 from the angle to the suture, occasionally with a few very fine inter- 

 stitial threads, 15 to 20 on the body- whorl ; the crossing-points some- 

 times slightly nodulous ; fasciole on the beak finely striated. Some- 

 times the spiral sculpture is predominant, the spirals becoming much 

 stronger, crossed only by flexuous axial strife. Colour light flavescent. 

 with a white band encircling the whorls, but mostly inconspicuous. 

 Spire high, conic, turreted, about 1| times the height of the aperture. 

 Protoconch of 2| smooth convex whorls. Whorls 7 to 8, markedly 



