8(5 MEMOIRS OF THE QUEENSLAND MUSEUM. 
The posterior canal is a little longer than the anterior and narrow ; the anterior 
canal is also a little broader ; the mouth is a little more open anteriorly though still 
narrow ; the inner lip seen as a very fine glaze only with no posterior nodulation, and 
only a very slight swelling anteriorly. The columella shows a faint plication inter- 
nally. The outer lip is thickened and rolled back and shows no internal noduling. 
Length 38 mm. ; breadth 9-5 mm. 
Habitat : Queensland. Type dredged on corals in 9-12 fathoms, Port Curtis. 
Prosimnia angasi Reeve is much smaller, stouter, extremities shorter, outer 
lip more thickened, and carries a notable swelling medially on the inner lip. 
Colus boardmani sp. nov. 
(Plate. IX, fig. 7.) 
Shell somewhat small for this group but regularly Fusoid in shape. Shell 
narrow, last whorl more than half length of shell, spire long, canal very long, mouth 
narrow, outer lip thin. Colour white, covered with a thin brownish crinkled 
periostracum. Protoconch of one and a-half whorls, a little bulbous, tip planate, 
regular sculpture of deep rounded few longitudinal ribs overrun by spiral threads. 
These ribs become less pronounced as shell grows older, and only appear as a slight 
nodulation on the last whorl ; conversely the threads become more pronounced and 
are regular concentric lirse with strong intervening threads on the final whorl. Ten 
adult whorls may be counted. The mouth is a rather small oval, inner lip as a thin 
glaze, columella smooth, canal very long and straight, sometimes bent with age. 
Length 78 mm. ; breadth 31 mm. 
Habitat: Queensland. Type dredged in 9-11 fathoms, Port Curtis. 
Pleuroploca altimasta sp. nov. 
(Plate IX, fig. 9.) 
Shell broadly fusiform, spire as long as aperture, body-whorl two-thirds the 
length of the shell, mouth oval, canal of medium length, open. Colour brownish 
yellow' almost hidden with dark brown, mouth fleshy buff. Sculpture consisting of 
spiral threads, more or less obsolete on middle of body-whorl and developed as lirse 
on earlier whorls. Longitudinal noduling obsolete though faint indications are 
suggested on the juvenile whorls. Last whorl sub-shouldered, lirse more pronounced 
near the suture and basally round the canal. Mouth oval, outer lip thick but not 
varicose, inside closely lined wth fine entering ridges. Columella with three plica:* 
low down, the anterior one much larger than the other two ; inner lip as a thin glaze 
only, a short ridge present near posterior angle. 
Length 96 mm. ; breadth 36 mm. 
Habitat : Queensland. Type from Port Curtis. 
This appears to be the coastal representative of the coral living Pleuroploca 
filamentosa Bolten. 
