222 REPORT ON ZOOLOGY, MDCCCXLII1. 



perspectivus, Koch, related to the fossil euomphalus, Ph., ayrestis, Ph., 

 resembling T. conulm, vinctm, Ph., by later observation found to be T. 

 biting ulat us, Lam., T. miniatm, Antou, Tr (Turbo) digitat-us, Desk, from 

 Acapulco The new species arc all given without any assigned locality. 

 In the second plate eleven species are figured : Turbo Fokkesii, Jonas, from 

 California, Tr. cicatricosus, Jonas, from New Holland, Tr. carinalm, Koch., 

 from Central America, Tr. rubrofammulatm, Koch, Monodonta Dunkeri, 

 Koch. Mon. Pliilippii, Koch, Tr. corriiyatus, Koch, the latter four without 

 assigned locality, Tr. chlorostomus, Meuke, from New Holland, Tr. striyilatus, 

 Anton., from California, Tr. tuberosus, Phil., related to Tr. ccelatus, Tr. toru- 

 losus, Phil., both without assigned locality. 



Philippi is in favour of a complete union of the genera 

 Trochus, Monodonta, Turbo, and with regard to this, expresses 

 the opinion that no great importance is to be placed in 

 the difference of the operculum. According to my researches, 

 there exist highly important anatomical distinctions, espe- 

 cially in the formation of the oral organs, which render it 

 necessary to admit a whole series of genera in this family. 

 There are species with a horny, and others with a calcareous 

 operculum, with and without maxillse, with and without 

 keel ; the presence or absence also, as well as the nature of 

 the umbilicus, is of great importance, and the peculiarities 

 of the aperture should not be disregarded. A more certain 

 definition of the genera cannot be effected until a sufficient 

 amount of observations on the anatomy of numerous species 

 has been obtained. The genera Trochus, Monodonta, and 

 Turbo, are obviously not sufficient and as such, are not to be 

 separated. 



Trochus Philberti and agathensis, Rccluz. (Rev. Zool.), on the coast of 

 Cette. T.nassaeiensis, Chenm. (ib. p. 107). T. subcarinata (Helix subcarin., 

 Montagu) (ib.) Tr. prashius, ciliaris, viridulas, chlorostomm (fig. by Philippi), 

 Preissii, Lehmanni (probably Phasianetta clec/ans, Lam.), impenius, vitilir/ineus 

 all from the west coast of New Holland, arc described as new species by 

 Meuke. (1. c.) 



Monodonta sitis, Recluz. (Rev. Zool.) Cctte. By Meuke, M. melano- 

 loma, baccata, cremilata, ringens, muxlllata, viryata, from the west coast of 

 New Holland. M. lupina and turrita are afterwards (Zeitsc. fur Maloco- 

 zoologic) recognized by the author himself as 31. dcnticulata and conica of 

 Gray ; M. apicinu is Trochus irisodontes of Quoy and Gaimard. 



