6 ZOOLOGY OF THE VOYAGE OF THE SULPHUR. 



GASTEROPODA. 



Family — Alat^e. 



Rostellaria, Lamarck. 



2. Rostellaria fusus. 



Murex fusus, Linn. Syst. Nat. ed. 10. p. 752. 

 Rostellaria rectirostris, Lamk. Hist. Anim. v. 7. p. 192. 



Inhab. Amboina ; where it is still much prized in collections. Its actual 

 locality is most probably the Island of Cerara. 



The necessity for the change of name, though to be deplored, is pointed out 

 by M. Desha}-es in a note of the eighth volume of his edition of Lamarck ; where 

 also will be found a valuable, but not complete synonomy. 



Family — Conace^e. 



Con us. JLinnceus, 



It is a very remarkable circumstance in the geographical distribution of this 

 large genus, that no species appear to exist on a very considerable extent of the 

 west coast of South America, and much of which is within the tropics. From 

 our own experience it is only found here between the Bay of Magdalena, 

 California, in 24° 38' north lat. and the Bay of Guayaquil in 2° 48' south lat. In 

 California two species are met together, Conus interruptus, and C. californicus 

 described below. The group of Cones, of which C. interruptus is typical, is 

 strictly American ; and the few kindred species are found in different situations 

 within this range. This limitation excludes any representative of the genus from 

 a portion of the coast where the temperature and climate do not appear in any 

 way unfavourable to their presence. In the Pacific, Conus are met with as far 

 south as any of the groups of islands, and C. millepunctatus, C. pulicarius and 

 their congerers may be regarded as characteristic of the West Pacific conchology. 

 Cypraea has, perhaps, an identical southern range, as C. exanthema was alone 

 seen by us so far south as the Island of Muerte in the Bay of Guayaquil. 



3. Concs marcMonatus, Hinds, Ann. Nat. Hist. v. 11. p. 256, (Plate Lfig. 6, 7.) Testa eco- 

 ronata, ordinatim conico-involuta, alba, rufo-fusco angulate reticulata ; spirS. depressa, mucronata, 

 canaiiculata, spiraliter striata ; apertura inferne paulisper effusa, prope basin sulcata ; epidermide 

 diaphana laevi induta. 



