20 Moll. 
MOLLUSCA. 
Oi:d. 2. Phanerobranchia (new). Rest of the Nudihranchia. 
Ord. 3. Sac oaLOSSA (new), Ascoglossa (Bergh, MS.). The teeth 
of the radula, after being worn out, are preserved in a 
peculiar sac in the buccal cavity beneath the front of the 
radula. Limapontiidas, Elysiidac, Phyllobranchidae, Placo- 
branchidac, Hermacidsc, Lophocercidac. 
Ord. 4. Steganobranchia (new). [Tectibranchia, Cuvier, 1817, 
= Pomatobranchia, Schweigger] ; Runcinidae, Siphonariidae, 
Pleurobranchidac, Aplysiidae, Bullidac, <S;c. 
Ord. 5. Branchiopnecsta (new). The pulmonary sac is homo- 
logous with the branchial cavity of oth er Mollusks. Eyes 
sessile ; Amphibolidae, Gadiniidac, Limnacidac, Auriculacea. 
Ord. G. Nkpii uo pn eusta (now). Pulmonary sac morphologically 
homologous with the last part of the kidney or cloaca ; eyes 
apical: = Stylommatophera (A. Schmidt). Helicidae, Lima- 
cidae, &c. 
Second class: Pteropoda (Cuv.). 
Third class : Cephalopoda (Cuv.). 
Critical observations on this system ; E. R. Lankester, Ann. N. H. (4) 
xviii. p. 77. 
Popular WorhSf Bibliography. 
W. Kobelt has published a popular treatise on Conchology, “ Illus- 
trirtes Conchylienbuch,” Niirnberg : 1876. The first part treats of the 
Cephalopoda^ Pteropoda^ Heteropoda^ and the Muricidce, Pyrulidce [Pir-], 
and Tritoniidce of the Gastropoda^ and is illustrated with 10 pis. 
A catalogue of the published works (books, pamphlets, and papers pub- 
lished in periodicals, 223 in number) of I. Lea, from 1817-1876, has 
been issued at Philadelphia, 1876, 22 pp. 
A bibliograph ical note on the “ Museum Boltenianum,^’ and on the 
prices at which some shells of it were sold in 1819 ; 0. Semper, Verh. 
Ver. Hamb. ii. pp. 121-125. 
CEPHALOPODA. 
Interesting observations on living Cephalopods, chiefly Octopus, their 
moving, fighting and copulation, made in the aquarium of the zoological 
station at Naples; Kollmann, Z. wiss. Zool. xxvi. pp. 1-23. 
Observations concerning the chromatophores in young specimens of 
LoligOy stating that the contraction is active and the expansion passive ; 
M. P. Harting, Niederl. Arch. Zool. ii. pt. 4 (1875 ?), pp. 13-30, pi. i. 
figs. 6-19 : extract in Ann. N. H. (4) xvii. pp. 174 & 175. 
Eledone, sp., from 350 fathoms, shore of Brazil ; Willemoes-Suhm,* 
P. R. Soc. xxiv. p. 578. 
Spirula reticulata (Owen), the entire animal from the stomach of a 
Macruriis captured in a depth of 300-400 fathoms, China Sea ; id. 
Z. wiss. Zool. xxvi. p. Ivi. 
