APPENDIX MOLLUSCA. 



551 



Fig. GO. 



SCAPHOPODA. 



CADULUS ARATUS, sp. nov. 



(Fig. 60.) 



Shell short and stout, slightly swollen and gently 

 tapering to either end, on one side almost straight, 

 on the other arcuate, glossy and almost transparent. 

 In one case the translucent ground is mottled with 

 opaque white spots. Four longitudinal equally spaced 

 furrows impress the surface. Anal end bilabiate, the 

 lips usually widely parted, that on the straighter side 

 projecting beyond its fellow. In one case the lips 

 are of equal length almost touching distally and 

 divided by a narrow slit. Aperture very oblique 

 with a small thickened rim. Length 3-4 ; breadth 

 64 mm. Another specimen, length 2; breadth -48 mm. 



Dredged 36 fathoms north of Pava Islet; 36 

 fathoms N. 30 W. of Pava Islet ; 50-60 fathoms 

 off Tutaga Islet and 150 fathoms off Beacon Islet 

 (Funamanu). 



The Fijian C. dichelus, Watson, a near relative, is twice as large, 

 more bent and unfurrowed. 



GASTEROPODA. 



SCISSURELLA EQUATORIA, Sp. UOV. 

 (Fig. 61.) 



Shell large for the genus, thin, trochi- 

 form, with gradate spire ; frilled, pro- 

 jecting keels ; compressed belt below 

 the fasciole, and tumid base. Colour 

 white. Whorls five. Sculpture about 

 eighty five, curved, oblique, lamellate 

 ribs cross the whole shell Above, the 

 spiral sculpture can hardly be traced, 

 but on the base it is distinguishable as 

 delicate, widely spaced threads over- 

 riding the ribs and latticing the inter- 

 spaces. Fasciole enfolded by broad 

 margins, which are fimbriated by the 

 ribs. Umbilicus narrow, infundibuli- 

 form, deep. Aperture oblique, sub- 

 quadrate; lip slightly and gently 

 recurved ; columella margin explanate 

 and reaching over the umbilicus. Major 

 diameter 3, minor 2'5; height 2'68 m.m. 



One specimen dredged off Tutaga 

 Islet in 200 fathoms. 



Fig. 61. 



