552 



FUNAFUTI ATOLL. 



Fig. 62. 



This, the largest species of the genus, seems very close to S. 

 aedonia, Watson, from which I separate it by the contracted zone 

 beneath the fascicle, larger size and less development of spiral 

 sculpture. 



SCHISMOPE PLICATA, sp. HOV. 

 (Fig. 62.) 



Shell large for the genus, thin, 

 subglobose, flattened above. Colour 

 cream. Whorls three, rapidly in- 

 creasing. Earlier whorls wound in 

 the same plane, the last steeply 

 descending, sharply angled at the 

 fascicle, compressed and then inflated 

 beneath it. Umbilicus moderate in 

 width, deep, with smooth walls. 

 Sculpture both above and below 

 the fasciole the shell is ornamented 

 by about twenty-two prominent 

 longitudinal ribs, which project 

 most beneath the fasciole half a whorl behind the mouth, from 

 thence on they diminish considerably. These are overridden by 

 close, sharp, raised, spiral lines, which cross the interstices and 

 denticulate the crests of the ribs. Slit pointed anteriorly, rounded 

 posteriorly, in length about a sixth of the circumference of the 

 shell. The fasciole, a broad gutter with raised margins, its trough 

 septate by continuations of the longitudinal ribs, ascends the 

 spire for a whorl and a half, as in other Pacific species. Aperture 

 ovate, columella slightly reflected. Major diameter 2'3, minor 

 1-7; height 2 mm. 



Dredged off Beacon Islet (Funamanu), in 150 fathoms, and off 

 Tutaga in 150 and 50-60 fathoms. 



This species stands nearest to S. ferriezi, Crosse, from which it 

 is clearly distinguished by a more elevated spire, coarser sculpture 

 and larger size. 



TBINOSTOMA QUALUM, var. PAUCICOSTAIUM, var. nov. 



(Fig. 63.) 



Under this varietal name is distinguished 

 a specimen, which, though probably imma- 

 ture is larger than the type, measuring in 

 major diameter 2 and in minor T32 mm. 

 It has the same detail sculpture but carries 

 sixteen ribs on the last whorl instead of 

 twenty. The chief distinction however is 

 that the ribs are continued to the suture 

 instead of terminating at a distance there- 

 from as in the type. 

 Dredged at 150 fathoms off Beacon Islet (Funamanu). 



Fig. 63. 



