MOLLUSCA. 553 
Chelidonura adamsit, 8p. n., Angas, Proc. Zool. Soc. 1867, p. 116, pi. 13. 
fig. 32, Port .Jackson. 
Pleurobranchid.®. 
[ Umlrella] Operculatum aurantiuniy sp. n., Pease, Am. Joum. Conch, iii. 
p. 287, Sandwich Islands. « 
NUDIBRANCHIATA. 
Thirty species of Nudihranchiates, inclusive of Fallihranchiata^ inhabiting 
the western and northern coasts of France, are enumerated by P. Fischer, 
Journ. Conch, xv. pp. 1-12. 
DoRIDIDiE. 
Doris derelictaj Fischer=Z). re/rwcosa of Philippi and Verany, not Cuvier, 
described by P. Fischer, Joum. Conch, xv. p. 7, Gironde and Mediterranean. 
TRITONIIDiE. 
Caliphyllaj g. n., Costa. Corpus elongatum, angustum. Tentacula duo 
foliacea longitudinaliter convoluta. Caput limbo labiali ampliato bilobo. 
Branchiae foliaceae, vasculares, numerosao, per totius trunci utrumque latus 
in varias series longitudinales irregulares digestae. Anus in latere dextro 
post orificia genitalia. Allied to the genus Physopneumon of the same author 
(Annuario Mus. Zool. Napoli, ii.). C. mediterranean sp. n., Gulf of Naples. 
Rendiconto Accad. Sc. Fis. e Nat. Napoli, vi. p. 137. 
Nemoeephala, g. n., Costa. Corpus tritoniaeforme. Caput margine antico 
semicirculari sex-digitato sive in appendices sex simplices cylindricas tenta- 
culiformes diviso. Tentacula ramdsa, in vaginam tubulosam retractilia. 
Branchiae arborescentes in dorsi utroque latere unica serie longitudinali dis- 
positae. Allied to Dendronotus, but having six simple, not branched, filaments 
in front. N. marmoratun sp. n., Gulf of Naples. Costa, 1. c. p. 137. 
iEoLIDIDiE. 
This family was made the subject of very exact and ex- 
tensive anatomical researches by Bun. Bergh in the years 
1854-62. They are now collected in one work treating of the 
outer forms as well as the anatomical structure of these animals. 
Peculiar optic ganglia are absent in this family ; the salivary 
glands are distinct and well developed, although their presence was 
denied by former authors. Urticating organs in the papillary 
appendages are characteristic of one part of the family; in all 
species provided with them, threads differing in forni according 
to the species are to be found throughout the intestinal tract, 
and are, without doubt, swallowed with the food. The supposi- 
tion of Huxley and Gosse, supported by Strethill Wright (Quart. 
Journ. of Microsc. Soc. 1862), viz. that the urticating organs 
observed in this family are not produced by the living animals 
themselves, but derived from the Coelenterata which they had 
devoured, is contradicted by B. Bergh in his monograph of 
Phidianttj p. 114. In some genera and subfamilies they are 
absent altogether, as in Embletonia, Fiona, Phyllodesmium, in 
