18 
CRETACEOUS ECnTXODERlIATA 
truncate, the anus a little more distant from the upper terminal erest, and the 
tubercles, on the lower side especially, are larger. In the number and relative size 
of the ambulacra both species very nearly concur. 
Localities. — Kear Karapaudy and South-West of jVrulloor, in whitish or yellow- 
ish brown, rather coarse sandstone ; tolerably common at the former, apparently 
very rare at tbe last locality. 
Formation. — Arrialoor group. 
10. IIemiaster pulles, SloUczka. PL II, Figs. 8—9. 
TIem. testa ])arva, amhitn corclate-ovato, alia, apice suhcentrali, panto anteriore, 
regione post-apicali mediana modice elevata, rotnndate snh-carinata, postice Iran cat a ; 
infra regionibas anfe-ct ptost-oralibns convexiascnlis ; snperficie nndique distinct e 
tvt)ercntifcra atqne in interspatiis minvte gran ntata ; tnhercidis in tatcre inferiore 
multo majoribns quani snperis ; ambulacris profnndis, inxeqnalihns ; sutco anteriore 
tatissiino, tuleribns rapide decdiribas ab apice ad fasciolam poris 17 in nna serie in- 
struciis, ad peripheriam ratde angnstato ac nsque ad aperturam extenso ; ambnlacris 
antero-lateratibus conspicniter tongioribns qnain jwsticis: q^rimis, quantum flexnosis, 
20 — 23, alteris oralis, 15 — 17 qxtria porornn in nna serie gerentibns, anibobus ad 
terminationes angustatis ; anterioribns angidodo°, qwslerioribus ang. lib° inter se dicer- 
gentibus ; fasciola modice lata, ambitu lestre similari. 
A small, rather regularly oA'ate species, comparatiA'ely A'cry coarsely tubercu- 
latcd and with the anterior ambulacral sulcus remarkably broad. In this last point 
the species resembles the previous one, JI. cristatiis ; but it AA'ants the posterior sharp 
intcr-ambulacral ridge and the ambulacra diverge less ; the posterior are compara- 
tiA'cly shorter, beiug about tlirce-fifths of the length of the anterior, they arc elong- 
ately OA'ate, while the anterior are conspicuously flexuous ; the apex also is more 
central in the present species than in the last. The height of the test somewhat 
varies, being usually equal to the distance between the anterior lip of the aj^erture 
and the anal end ; in the most depressed and one of the smallest specimens it 
oidy equals the distance from the loAver lip to the t^ostcrior end. 
iomhYy.— Xeighbourhood of Arrialoor, in Avhitish, line-grained sandstone. 
Formation. — Arrialoor group. 
11. IIeaiiasteii SEXAXGELAxrs, D'Orbigiuj. PI. Ill, Fig. C. 
Xo specimen of this species exists in our collection, and although much inter- 
ested in the question, Avhether the specimen figured by D’Orbigny in Voy. Astro- 
labe, Paleont., pi. V, figs. 47 — 49 is the same, or not, as the one figured by the same 
author in Pal. Franc, terr. erct., vi, jd. 889, I had not been successful in tracing 
D’Orbigny’s type in the Museum at Paris, aaIicu specially inquiring after it in 
( 88 ) 
