MOLLUSC A. 
265 
Opisthobrancliiatri^ followed by detailed descriptions of tbe 
nineteen species observed by tlie antbors. All are figured in 
natural size, magnified, and with addition of tbe details of tbe 
buccal organs. Tbe plates are beautiful and equal to those in 
tbe British Nudibranchiate Mollusca by Alder and Hancock. 
All the species will be mentioned subsequently, although one 
only is a new species. Tbe plates are not numbered, but placed 
between tbe letterpress, so that they must be referred to by the 
pages. 
Stuart, A. Ueber die Entwickelung einiger Opistbobranchier. 
[On the development of some Opisthobranchia.] Zeitsebr. 
tiir wiss. Zool. xv. pp. 94-103, pi. 7. figs. 1-13 ; also in Ca- 
nestrini^s Archivio per la Zoologia, FAnatomia e la Fisio- 
logia, Modena, vol. iii. April, pp. 328-334. 
Contains some observations on tbe ova of Aplysta and Eolis 
{Cavolina) peregrina^ the advancement of their development in 
a higher temperature, the formation of tbe central spot (central 
vesicle of other authors) in the egg, the cilia and muscles of the 
larvse \ the author has no doubt that the cilia and muscles are 
morphologically identical. 
Suborder Tectibranch iata. 
Tornatellida?. 
Tornatella inmcioccclata^ sp. n., Carpenter, Joiirn. Conch, xiii. p. 139, 
California. ' 
CYLICIINlDiE. 
Cylichna {cylindracca, var. .P) attonsa, sp. n., Carpenter, Proc. Acad. Nat. 
Sc. Philad. 18G5, p. 58, Puget Sound ; C. planata, sp. n., Carpenter, Journ. 
Conch, xiii. p. 139, S. Diego, California. 
Cylichna truncata (Montagu), Meyer and Mobius, 1. c. p. 87. The living 
animal is described and figured. No radula; the stomach armed with 
three oval tuberculiferous plates. 
Amjdiisphyra expansa, sp. n., Jefirej^s, Report Brit. Assoc. Adv. Sc. for 1864, 
p. 330, from the Shetland Islands. 
Volvrda cylindrical sp. n.. Carpenter, Ann. & Mag. Nat. Hist. xv. p. 179, 
Sta. Barbara, California. 
Bullidas. 
Bulla cumicra, Crosse, sp. n., Journ. Conch, xiii. p. 40, pi. 2. fig. 7, South 
Australia. 
Accra hnllata (Muller), Meyer & Mobius, 1. c, p. 81. The swimming or 
rather flying of this animal through the water is described. 
PhILINIDA!. 
Philine aperta (L.), Meyer & Mobius, 1. c. p. 77. 
