82 Moll, 
MOLLUSCA. 
of repair of a fractured part by the formative border of the mantle, the 
similar porcellano-uacreous structure of the shell, and the entire want of 
any trace of an ink-bag, prove surely that Ammonites has nearer rela- 
tions to Nautilus than Spirula. The author also maintains his view that 
the so-called Aptychus (Meyer, 1831), or rather Trigonellites (Parkinson, 
1811), is a calcified external layer of what is called the hood in Nautilus^ not 
the cover of the nidamental glands, as Keferstein supposed, because the size 
• of these glands must be very variable, as they are only periodically 
active, and the shape and contiguity of the shelly or horny plates cor- 
responds in a remarkable degree better with that of the hood, than that of 
the glands ; this being accepted, a further near relation between Nautilus 
and Ammonites results. Finally, Owen treats of the formation and 
function of the sipho, describing a gradual series from the simple internal 
septa of Vermetus, through the hollow chambers with central adhesion at 
the spot of the adductor muscle in the shell of Spondylus, to the chambers 
and hollow sipho of the shells of the Cephalopods j he states that the soft 
sipho in Nautilus contains an artery and is often coated by a thin cal- 
careous deposit which he thinks is destined to maintain the vitality of the 
shell. P. Z. S. 1878, pp. 965-975, pi. lx. 
Note on abnormal chambering by resistance of the sipho in some 
Silurian Cephalopods, by H. Dewitz, Z. ges. Naturw. li. pp. 295-310. 
PTEROPODA. 
Clio limacina (Phipps), Sars, Moll. arct. Norveg. p. 332, pi. xxix. fig. 4, 
radula, pi. xvi. fig. 21. 
[^Cleodora] Clio pyramidata {'Qvoyfn) ; radula, id. 1. c. pi. xvi. fig. 20. 
Limacina helicina (Phipps) ; id. 1. c. p. 328, pi. xxix. fig. 1, radula, 
pi. xvi. fig. 17. 
Spirialis balea (Moller) gouldi (Stimps.) and S. retroversa (Fleming) 
= stenogyra (Phil.) ; id. 1. c. pp. 329 & 330, pi. xxix. figs. 2 & 3, radula, 
pi. xvi. figs. 18 & 19. 
HETEROPODA. 
Note on the auditory organ by Ceaus, suprd^ p. 11. 
GASTROPODA. 
PEOTINIBBANGHIA. 
Muricidji and Purpueidj:. 
Murex pereger^ sp. n., Brugnone, Misc. mal. i. [1873] p. 10, fig. 17. Pro- 
bably from African sponges ; perhaps identical with hyhridus (Aradas & 
Benoit, 187G), but distinct from erinaceus (L.) ; id. op. cit. ii. [1876] 
p. 25. 
Murex (Ocinebra) erinaceoides (Valenc.) = P (Brod.) = ? cali- 
fornicus (Hinds) ; Stearns & Tryon, P. Ac. Philad. 1878, pp. 395-397. 
