BY THE REV. J. E. TENISON-WOODS. 
1063 
Pt. C?) spiracellum, a. Ad. and Reeve ; Pfr. Mon. Pneumon. 
p. 50= Cyclostoma spiracellum, A. Ad. and Reeve, Yoy. Samar. 
Moll. p. 56, pi. 14, fig. 1 j Pfr. Mon. Pneumon. p. 50. 
Borneo. 
Pt. labuanensis, Pfr. Proc. Zool. Soc. 1863; Mon. Pneumon. 
Suppl. II. p. 41. 
Labuan. 
Pt. lowianus, Pfr. Proc. Zool. Soc. 1863 ; Mon. Pneumon. 
Buppl. II. p. 41. 
Labuan. 
Pt. sumatranus, von IMart. Monatsber. Berl. Ak. 25 Feb. 
1 864 ; Pfr. Mon. Pneumon. Suppl. II. p. 42. 
Sumatra. 
Pt. batchianensis. Reeve, Conch. Icon. sp. 6, pi. 2 ; Pfr. Mon. 
Pneumon. Suppl. II. p. 43. 
Batchian. 
Pt. (1) eudaedaleus, Crosse, Jour. Conch. XVII, 1869, p. 187; 
Pfr. Mon. Pneumon. Suppl. III. p. 51. 
Borneo. 
24. Spiraculum, Peanson, 1833, Jour. R. As. Soc. II. p. 391 ; 
H. and A. Adams, Genera, p. 278. 
SAell depressed, sub-discoid, with a thick periostraca, which is 
sometimes covered with small hau’s ; aperture circular ; at the 
la.st whorl a sutural tube formed by the union of the outer layer 
of the shell over the channel on the penultimate whorl. By most 
authors thi.s is regarded as a sub-genus of Pterocyclos. 
Spiraculum (?) regelspergeri, de Morgan, Le Naturali.ste, 
VII. 1885, No. 9, p. 69 (Cyclophorus) ] 0. von Mdllendorff, Join*. 
As. Soc. Beng. TiV. 1886, p. 308. 
The last-named author .says (l.c.) that the species is decidedly 
not a Cyclophorus but a Pterocyclos, which might bo related to 
