MET.VII,!, : FREDERICK PRICE MARRAT. 227 



I shall personally always feel much indebted to him for having 

 kindly volunteered to name and classify the whole of my collections 

 of the three genera he especially affected : Nassa, Oliva, and Margin- 

 ella, thus adding much to the intrinsic educational value of the series. 



Amongst the many subjects treated of in the scientific papers 

 contributed by Marrat, the following seem especially deserving of 

 passing notice at the present juncture : — • 



(a). — The fine Rostellaria marfinii, described as Gladius viartinii^ 

 was the most important shell to which he stood godfather. Of this 

 two specimens were obtained by the late Mr. Sidney Trice Martin, 

 from Cebu, Philippine Islands, one of which (the type) is in the 

 Liverpool Museum ; the other now in my collection ; while a third 

 has been recently acc|uired by the British Museum (Nat. Hist.). 



{by — In the genus Margiuella several species were described by 

 him, mostly from the collection of Mr. Keen/ of Liverpool. 



(t). — Mollusca from the west coast of Africa, likewise, were of 

 special interest to him, as evidenced by a paper from his pen, 

 describing several forms of Marginellidte and Pleurotomidre, many 

 collected by Captain Cawne Warren, or in the " Keen " collection.^ 



{d). — And, finally, Euliina caiidida Marrat^ is the noblest species 

 of that interesting genus. It is now ascertained to come from the 

 Island of Formosa. 



1 Journ. of Conch., vol. i, p. 244, with plate, 1S77. 



2 Journ. of Conch. , vol. i, pp. 136, 179, 204, 1S76-77. 



3 Journ. of Conch., vol. i, p. 381, 1878. 



4 Proc. Liverpool Phil. Soc, p. 339, iSSo. 



Note on Crepidula fornicata L. — Crepidnla foniicata L. the "crow-oyster," 

 originally introduced with American oysters, has been found in several of the rivers 

 of Essex for eleven years or more. It would appear that the conditions in (he 

 Crouch river are particularly favourable to it, as it is fast becoming a nuisance to the 

 oyster-men at Burnham-on-Crouch. In some parts of this river nearly every pebble 

 and old shell has one or more (generally more) specimens on it. Clusters of five or 

 six, one on the back of the other are common ; one group found this year had no 

 less than nine in this position. Some pebbles carry a cluster on both sides ; even 

 the neck of a broken bottle gave foothold to two inside and three outside. The 

 lowest shell of a group is obliged to adapt its form to the pebble or shell to 

 which it is attached, consequently some curious forms occur. Where the base is an 

 old oyster the bottom Crepidula is remarkably flattened ; but whatever the .shape of 

 the lowest may be, those above it are usually normal in form. — J. E. Cooper {Read 

 befoie the Society, September 13th, 1905). 



