107 



are also otherwise slightly different from ambiguus, by 

 Mabille's name bourguignati. But aside from questions of 

 nomenclature, the interesting fact remains that we have both 

 subspecies in these islands." 



Mr. Billups also exhibited a large number of miniature 

 Mollusca, and read the following notes : — " It will be in the 

 memory of many of us now present, that at a previous 

 meeting Mr. Barrett was good enough to bring to the Society 

 for distribution amongst the members, a quantity of sand, 

 tidal drift, etc., which he had collected after a storm on the 

 coast of South Wales, and finding it rich with Mollusca, 

 Polyzoa, Hydrozoa, etc., thought perhaps some of the 

 members would be glad to select specimens for their micro- 

 scopes. Some fourteen or fifteen gentlemen availed themselves 

 of Mr. Barrett's kindness, but I have not heard the result of 

 their researches. Thinking that perhaps it might interest 

 the Society, I have briefly jotted down my own slight observa- 

 tions and results. From a small portion of sand, the same 

 as I now exhibit in the test tube, and in quantity about half 

 of a small teacupful, I have found no less than sixty-one 

 species of Mollusca, consisting of fourteen species of Con- 

 chifera (or Bivalves), and forty-seven of Gasteropoda (or 

 Univalves). This does not include two species of Cirripedia 

 (Barnacles or Sea Acorns), which till lately used to be classed 

 with the Mollusca, on account of their shells, but are now 

 universally admitted to be Crustaceans. As I have not had 

 an opportunity to work out the whole of the species repre- 

 sented, I simply give the families and genera of the Mollusca 

 exhibited. In the Bivalves we have eight families, repre- 

 sented by fourteen distinct genera as follows : The family 

 Tellinidse being represented by the genus Tellina ; the Saxi- 

 cavidae by Saxicava ; the Lucinidae by two genera, Lticina 

 and Axinus ; the Kelliidse by three genera, Kellia, Lascea, 

 and Montacuta ; the family Mytilidse having two genera, 

 Mytilus and Modiolaria ; the Pectenidse being represented 

 by one only, the genus Pecten ; the Ostreidas (or Oyster 

 family) having two, the genera Anoniia and Ostrea ; the 

 Carditidse, by the genus Cyamiuvi ; the Cyprinidas by Circe ; 

 and lastly the family Cardiidas by the genus Cardium. 

 Amongst the Gasteropoda we find a much larger number of 

 forms, there being no less than eighteen families, represented 

 by forty-seven species in twenty-seven different genera, as 

 follows : The family Skeniadse by the genus Skenia ; the 

 Patellidae by the genera Patella, Helcion, Acmcea and 

 Capulus ; the Bullidge by Utriculus and Philine; the 



