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UNITED STATES NATIONAL MUSEUM BULLETIN 296 



detect the attachment end in slits 3 and 4 without recourse to the 

 animal, or by observing the more precipitous slope inside the burrow 

 on the attachment end. The interior of the burrow conforms essentially 

 to the shape of the mantle of the female. 



Weltneria aapta, new species 



Figure 4 



Diagnosis: Weltneria mth operculum terminating anteroventrally 

 in a pair of opaque, stout spines, with an array of over twelve hyaline 

 spines along each lip of the mantle aperture. All spines are approxi- 

 mately of the same length. Many hairs and bifid teeth also arm the 

 operculum. 



Etymology: dapt- (Gr.), unapproachable, because of the spines. 



Distribution: Twelve specimens found associated with Lithoglyptes 

 calcaratus, from Berylsma waitei Hedley, from fish traps off Port 

 MacQuarie, northern New South Wales, Australia, collected by J. 

 Kerslake, from the Australian Museum. 



Type-material: Holotype: Australian Museum. Paratypes: 

 CA, SFSC, UCT, USNM. Additional material: Seto, Vict. 



Figure 4. — Weltneria aapta, new species, from Berylsma waitei from Port MacQuarie, New 

 South Wales, Australia. Female opercular area, side view. On mantle margins, the spines 

 and scales are outside, the hairs inside. 



Dimensions: Holotype: 2.7 X 1.5 mm, with aperture of 1.25 mm. 

 Average of eight other specimens, once dried but soaked out in acid 

 alcohol: 2.81 X 1.38 mm with aperture of 1.27 mm. 



