MR. ALDER ON THREE NEW SPECIES OF ANIMALCULES. 
365 
Alive. Dead. 
Bullastravirginea\ss scl. ccs ssice vcles ceielse - 2or3 
Cyprina Islandica..............66 ..... | afew young. valves. 
Astate compressa ........e0-.ee a few. a fewe 
Wanmoniseseeciesi cece - a valve. 
(Wonaxtanatina eevee cient vietietstetes - a valves 
Psammobia Ferroensis.........0..e+0-% - 2 or 3 
tellinella = a valve. 
Syndosmya prismatica........... - 2 or 3 valves. 
alas steer eats sion seis wiattaachals - 1 
IMactravellipticascnns scr «ssieiclecle a few. - 
@rytodoniflexuosum ies... 21 /01e.2)a\s1-l0\e\eleie 2or3 a few. 
Lepton convexum.... - several. 
Kelliaisuborbicularis ..:.......06 00s ++ 2 a fewe 
Montacutabidentata 5... .. elie. 1 wiclsieis'e - several. 
ferruginosa.....,.- - several. 
Newera cuspidata .. .2.. scsese sees ee aees 1 = 
Corbulateibbawarrcieccncven cen euveulroctiet a few. a few. 
MWhTacialCONVEXK Ase sieckecinccs cei smnalecis - broken valves. 
villosiuscula.......... - a valve. 
Cistorcarcmrtins cess siete - a valve. 
Lyonsia Norvegica ... 3 - 
EV iy axtEUN GALA et slel srers et stetslere slis aversteletorsdele itt 2 young. a few young. 
Solen pellucidus 1 broken. - 
SaxdcavaimugOsasmeiiesicrc/siicieieeisicieinieercisiets a few. several. 
Relonaiaicorrucata, sec. sees ce eels meves er 2or3 e 
XVI—An Account of three new Species of Animalcules. 
By Josuva Atpsr, Esq. 
[Read Wednesday, December 12th, 1849.] 
WHILE examining a specimen of Sertularia pumila, taken from 
the rocks at Whitburn, under the microscope, I was struck with 
the appearance of what seemed to be a very minute parasitic 
zoophyte, several specimens of which were attached to different 
parts of the Sertularia. 
