MEI.VILt- : GENERA PSEUDOLIVA AND MACRON. 32I 



Since 1853 the following species have been added: — 



P. ancilla Hanley, 1859. 

 „ cotnmoda H. & A. Ad , 1863. 

 „ livida A. Ad., 1854. 



P. nassoiJes Hanley, 1859. 

 ,, slereoglypta Sowb., 1882. 

 „ wrightii Yi. A^-, 1865, 



It seems strange that such Gastropods as these, so nearly allied to 

 genera which live at half-tide mark or on seaweed covered rocks in 

 the littoral zone should be so rarely obtained. With the exception of 

 Macron livida A. Ad., now common enough, and P.plumbea Chem.(this 

 last, however, being very uncommonly met with in fine condition), 

 all the species of both genera are very scarce, and several still remain 

 unique or practically unknown.^ 



Tryon" admitted the following species of Pseudoliva: — 



4. P. zebrina A. Ad. 



5. ,, 7iassoides Hanley. 



6. „ ancilla Hanley. 



1. P. plmnbea Chem. 



2. ,, striafula A. Ad. 



3. ,, sepimana Tryon {~se.pi- 



menta Rang.). 

 We will take these seriatim : — 



I. Pseudoliva crassa. 



Utricuhis Levis, edentuhis Martini, "Conch. Cab.," vol. 3, pp. 



391, 424, pi. 120, f. 1099, HOG. 



Buccimim crassnvi Gmelin,"Syst. Nat.,"ed. xiii.,f. 3485, 1790. 



„ plumbeum Chemnitz, xi. t. 188, f. 1806, 1807, 1795. 



Pseudoliva phunbea Svvainson, "Treatise Malacol.," pp. 133, 



306, f. 3a on p. 82. 

 Eburna plmnbea Sowerby, "Conch. lUust.," f. 3, 4. 

 Monoceros plumbeuni Reeve, "Conch. Icon.," iii., sp. 8, 1846. 

 B. testa globoso-ovata, crassa, ponderosa, spira brevissi?fia, acuta; 

 anfractibus superne tumidis, columella arcuata, bast mucronata, 

 super7i'e callosa, labro tenui, simplici, dente parvo basim versus minuto, 

 aurantio-lutea, epidermide crassa olivaceo-fusca induta. (L.A.R.). 



Hab., ? 



This robust, plain species is very frequently found in dead or poor 

 condition, more rarely alive, when it is covered with a cinereous-olive 

 epidermis, which no doubt suggested to Chemnitz the trivial name. 

 It much resembles an Olivaftcillaria, some of the more inflated Bulliie, 

 or, were it not for the absence of the dorsal spiral groove on the last 

 whorl, the Cotninella macula ta Martyn, from New Zealand. Large 

 examples attain a length of nearly two inches. Allied -to this are 



I In searching through all the catalogues of the more important collections of moUusca 

 dispersed during the past forty years I can only find one or two notices of Pseudoliva: being in 

 these collections. The richest cabinet for them must have been that of Mr, Lombe Taylor, who 

 possessed P. sepiwenta and other great rarities. 



3 G, W. Tryon, " Man, Conch.," vol. 2, p. 196, vol. 3, p. 214. 



