MOLLUSCA. 
209 
after some time into other Synaptse. How far they are developed 
before this immigration takes place, and how they enter the 
Synapta, is not yet known. Probably only very young Synaptse 
are invaded by this parasite, the size of the latter being always 
proportioned to that of the former, and the parasite being 
fixed, in every case, to that part of the intestine which is first 
developed in the young Synapta. 
Suborder Toxifera. 
CONID^. 
M. Boivin describes and figures the following species of Comis in .Toiim. 
Conch. 1864 : — C. consul, p. 33, pi. 1. figs. 6, 6 ; C. daphne, p. 36, pi. 1. figs. 7, 8, 
Indian Ocean ; ” C. Uctor, p. 36, pi. 1. figs. 1,2} C. doUum, p. 38, pi. 1. figs. 
3, 4} C, miser, p. 39, pi. 1. fig. 9, Cape Verde. 
PLEUROTOMIDiE. 
Pleurotoma apiculataj Montrouzier, Journ. Conch, p. 264. pi. 10. f. 2. Art 
Island, New Caledonia. 
Pleurotoma imdatiruga (Bivona) has been found in a recent state, at 
Algiers, where it is not very rare, by M. WeinkaufF. Joum. Conch, p. 15. 
Drillia appressa, Carpenter, Ann. & Mag. Nat. Hist. xiv. p. 46. California. 
Cithara fiisconotata, Carpenter, ibid. California. 
Manyclia suhdiaphana. Carpenter, ibid. p. 46. California. 
Suborder Rostrifera. 
Cypr;eid;e. 
Cyprcea candidula (Gaskoin) in Corunna Bay, hitherto not known as Euro- 
pean. M 'Andrew, Ann. & Mag. Nat. Hist. xiv. p. 232. 
Cancellariid^.. 
Cancellaria cancellata (L. sp.). The living animal, found on sandy ground 
in a depth of only 25-30 feet, is described by Weinkauff, Journ. Conch, p. 13. 
Cancellaria spenglcriana. Soft parts described } no operculum. A. Adams, 
Ann. & Mag. Nat. Hist. xiii. p. 143. 
CERITHnUA!. 
Cerithium monachus, Crosse et Fischer, Journ. Conch, p.347. Port Adelaide. 
Bittium nitens. Carpenter, Ann. & Mag. Nat. Hist. xiii. p. 478. Cape St. 
Lucas, California. 
Melaniid^. 
Melania psorica, Morelet, Journ. Conch, p. 287, Madagascar ; and M. sori- 
cidata, Morelet, ibid.. Great Bassam, W. Africa; Melania plumhea, Brot, 
Journ. Conch, p. 19, pi. 2. f. 1, New Guinea ? ; Melania montrduzieri, Gassies, 
Actes Soc. Linn. Bordeaux, xxi. 1864, New Caledonia ; this species had been 
figured, without description, in the same author’s previous work on the 
Mollusks of New Caledonia. 
Goniobasis. Mr. G. W. Tryon gives a synopsis of the species of the genus 
1864. [voL. I.] p 
