342 REPORT ON ALBATROSS MOLLUSCA DALL. 



This singular little shell appears to be the only representative on the 

 shores of America of the Australasian Bankiria. The tentacles did 

 not appear ciliated, nor could I observe any cephalic lappets between 

 them. The difficulties of observation, however, are so great with so 

 minute an object that their absence can not be dogmatically affirmed 

 merely from an examination of alcoholic specimens. 



Genus GAZA Watson. 



Gaza Watson, Jour. Linn. Soc, Xlv, p. 601, 1871) ; Challenger Gastr., p. 93, 1885. Type 

 G. dcedala Watson. 



Gaza Rathbuni Dall. 



Plate vn, Fig-. 4. 



Ga:a Rathbuni Dall, Ball. Mus. Comp. Zool., XVin.p. 354, June, 1889. 



This species differs from its nearest ally among those already known 

 (G. superba Dall) by being more depressed, with stronger spiral grooving, 

 a slightly smaller umbilicus, and more flattened over the sutures. The 

 single specimen obtained has not yet formed the reflected lip and callus 

 over the umbilicus. Maximum altitude of shell, 24 ; maximum lati- 

 tude, 3S mm . 



Operculum of about seven whorls, thin and polished, slightly cen- 

 trally concave, with a narrow thinner band marginating the coil. It 

 has a maximum diameter of lG mm . 



Hab. — Station 2S18, near the Galapagos Islands, in 392 fathoms, sand ; 

 bottom temperature 44° F. 



As the specimen of this fine species is not quite mature it has been 

 figured in a position which will enable it to be compared with G. superba 

 and other species of the genus. The soft parts recall those of G. superba 

 Dall, but the muzzle seems shorter and there are seven slender, rather 

 loug epipodial filaments on the right side, instead of five as in G. superba. 

 The intestine is crammed with foraminifera. The pointed tail-end of 

 the foot, in the contracted animal, is turned directly down aud in, so 

 that the angles of the fold stand out aud at first give the impression 

 that the foot is bifid, behind. 



Subgenus CALLOGAZA Dall. 



Callogaza Watsoni Dall. 



<". IValumn Dall, Bull. Mus. Comp. Zool., ix, p. 50, 1831 ; XVIII, p. 356; PI. xxn. Figs. 

 7, 7a, 1889. 



Hab. — Antilles, between Florida Strait and Barbados, in 84 to 640 

 fathoms, Blake expedition. Station 2756, in 391 fathoms, sand, off the 

 Para River, Brazil ; temperature 40°. 4 F. 



This extends the known range southward about 1,00!) miles. 



