TABLE OF DOUBTFUL SPECIES, 187 
Taste II.—List of Bad and Doubtful Species in Alphabetical Order. 
2 | 3 aie | 
Sule. aa Ab eon leas 
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Acanthospongia siluriensis, Salter............2...0.secceeceees 177 tei 
Astylosponpia grata, Salter, MS. .......2....c0.se0-sseestesees AUCs x 
IBOLMOCOMIS Ppl AN Ay AGN) ater ences scteiatccetiecer | tencmsins+sees 178 das me 
@nemidiumiutente: Lonsdale, cazecscsees cos cattees occtiese snmeeses 178 x 
Coscinopora placenta, Lonsdale ............ceessesecsensences os 178 x 
Entobia (Cliona) antiqua, Portlock ......6.......:secesseee ees 178 x 
Favospongia Ruthveni, Salter, MS. .............cccescee eee ee 179 me eX 
Iischadites micropora, Saveer nas.cs-05-peeseesecscse or ee evosis n= 179 x 
Mammillopora mammillaris, Aing..............0..ccc0eeeeeeee 179 noe ex 
Palewacis cuneata, Meek and Worthen sp. ............00.020005 180 sia x 
Protosponpiarditiusa, Sacer 8.150... secerccsescncereeeesse 180 x 
— piabellawlHicH sprees. csris-aesecontescessks aes 180 x | 
-- PoMAJORN HCCK Sh on eeec ea issaesssadeeae ses setos 180 x 
= (ud ensis ie ALOUl tesete: terete cscncuctessssaesst access 180 x 
— MACUL EOTIMISNL OL .2) eenents catjes cosseaiseis sie a 180 x 
Bulyiltus; Rhomsoniy) Carter, secs. secssae2-e4csaesemennseds 00 181 | x 
Scyphia tuberculata, King .................. Pte a waeeanenacoet 181 = x 
SMB LUT ITI CARLTON SOLE ie ae mi ccaise scale sieeerins tas s/o%)e tinier 182 ae x 
Spherospongia hospitalis, Salter ............ceeeee sence cence 182 x 
Steganodictyum Carteri, MU Coy.........:00..-coesecsecesesseess 182 x 
— cornubicumy MUS Coy. gee.cs.cc en sesuevensoes 182 x 
rac oss BINN OVI, A077 tnccnsaedamrcse: seatesGenscaaetessnscesees 153 eX 
== PESEMICIECULATO! [MSI] ) ME Cour. acs manccaneeetc-cecceen eens 183 x 
———) w Munstalllensiss Aang e.cc2. sccsescdsiccsisanen voureceres onees 183 x 
Verticillopora abnormis, Lonsdale .............0.12.ccseee eee ees 183 x 
— Giulia aes Coy pe crores scccencusesscder sesas: 184 a x 
— MAMA Ay SALECIer sacteeemccncetaceacinsse-1sesicca es 184: x 
Waoa\(Cliona)sprisca,. Us Coy) nececea sen -cetecn cc eders. scenes 184. x | 
Tt will be seen from the foregoing list that in all fifty species of fossil Sponges 
have been enumerated from the Paleozoic strata of the British area. 
The numbers 
of species of each of the principal groups of Sponges are as follows :—Monactinel- 
lide twelve, Tetractinellidz seven, Lithistide five, Hexactinellide seventeen, 
Octactinellide two, Heteractinellide six, and Calcispongix one species. 
From the Cambrian strata there are at present three species known, all of 
which are Hexactinellids: from the Ordovician five species, two of which are 
Lithistids and three Hexactinellids; from the Silurian ten species, of which one 
belongs to the Monactinellide, eight are Hexactinellids, and one an Octactinellid ; 
from the Carboniferous thirty-three species, of which eleven are Monactinellids, 
