SUPPLEMENT. 177 



West of Ireland (Battersby) ; southern entrance of St. 

 George's Channel (M'Andrew) ! This pretty creature evidently 

 loves the cool shade. Specimens which I put on a hunch of 

 Chondrus crispus soon crept away and got on the underside. 

 M. Mittre's notion that it lives on seaweeds must he erroneous. 

 It has no oral apparatus for taking such food. The indraught 

 through the open fold of the mantle is precisely similar to 

 what I have also observed in other bivalves which subsist by 

 absorbing minute organisms into the stomach. The repro- 

 duction and embryogeny of Galeomma are unknown. 



P. 194. LEPTON SQTJAMOSTTM. F. L. nitidum of S. Wood 

 appears to be the young of the present species ; Monte Mario 

 (Conti)! E. Cherbourg (Recluz, MS.). 



P. 198. L. NITIDUM. F. Clyde Beds ! E. G. Gascony, 

 40-80 f. (de Folin) ; Naples, 60 f. (Acton) ! 



P. 201. L. SULCATULUM, E. Sicily (Stefanis) ! 



P. 202. L. CLAMLas. Falmouth (Hockin) ! ; Jersey (Dodd) ! 

 F. Coralline Crag, Sutton (coll. Wood)! 



P. 205.' MONTACUTA suBSTRiATA. Shetland, 170 f., on 

 Spatangus meridionalis. F. Norway (Sars) ; Monte Mario 

 (Rigacci, as Elizia orUculata of Conti) ! E. Norway, 10- 

 250 f. (Sars) ; Arcachon (Lafont) ! ; Dalmatia (Brusina, as 

 Kellia spantangi} ! The fry are nearly globular, like Kellia 

 suborbicularis, with the beak in the middle of the dorsal area. 

 Sphenia costulata, Macgillivray. 



p. 208. M. BIDENTATA. F. Fairlie, near Glasgow (A. 

 Bell) ! ; Bohuslan(Thuden) ; Monte Mario (Conti and Kigacci) ! 

 E. As far north as Oxfjord in Finmark, shore to 50 f. (Sars) ; 

 Adriatic (Brusina)!; Madeira (Johnson) ! 



P. 210. Add M. TUMI'DULA*, Jeffreys. 



SHELL rhombic-oval, resembling in shape a young Tapes 

 virgineus, rather gibbous, thin, semitransparent, glossy, and 

 prismatic : sculpture, numerous and close-set delicate, micro- 

 scopic concentric striae : colour pale yellowish-brown : epider- 

 mis fine and silky : margins, on the posterior side extremely 

 short and abruptly sloping downwards, without any of the 

 angularity which characterizes M. bidentata ; in front gently 



* Somewhat swollen. 



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