or SOUTHERN INDIA. 
o 
t> 
1 
2. ? Cassidulus testl’do, (ForhesJ. PI. Y, Fig. 9. 
1846. NucleoUies (Pyyorhynrhus) testudo, Forbes, Trans. Geol. Soc., Lond., vii, |). 161, pi. xix, fig. 2. 
1847. Fyyorhynclnis testudo, Agassiz. — idem, d'Orbigny, Desor, et auctoruin. 
No specimen of tins interesting species unfortunately exists in our collection, 
1)ut 1 compared Forces’ original in 1807 and found it to agree with liis descrip- 
tion and iigure. 1 give, therefore, a copy of both. 
“N. ovatus, gihhosus, verticc supra-anali, marginihus dcclivibus, sulco anali 
“ lanceolato, declivi.” 
“ Length 1'4 inch. Breadth I’l inch. Height 0’7 inch. 
“ Oval, gihhose in the centre, ivith very abrupt sloping sides. 
“The liighest part is in the posterior (inter-) amhulacral space. The posterior 
“ extremity slopes rapidly to the margin, and includes the long anal groove. The 
“ dorsal anihulaera are very regularly lanceolate and stellate. The pairs of pores 
“ are eonnected by grooves, which are not easily seen, either owing to the imperfec- 
“ tion of the specimens, or from their having been originally obsolete. The undcr- 
“ surface is very concave. The mouth is rather eccentric, and is surrounded by five 
“ strong tulicrcles, between which radiate in star-like fashion five ovate ambulacra. 
“ The spinigerous tubercles of the under surface are very strongly marked.” 
It will be seen from the above that Forbes alludes to the presence of grooves 
between the pores of each pair in the poriferous zones, hut I could not obseiwe them 
in the type, and, in spite of the rather strong concavity of the under surface, the 
present species is, I hclieve» referable to Cassidulus ; it has not the long ambulacra 
of a Ptjgorlujnchus. 
3. Cassidtjlus Emys, StoUczJca. PI. V, Fig. 12. 
C. testa elUplica, modice convexa, regione 2 )ost-apiccdi altiore, laterihiis undiqve 
gradutinb et convexhiscule decUcibus, ad peripheriam suhangulata, infra deplanata ; 
^aper fide supera minute, infera ct'asse tuherculifiera, reglone mediana infera scroblcu- 
late gramdata ; apice valde eccentrico, autico ; fetalis subeequalibus, duobus antero- 
lateralibus cceteris paido brevioribns,primis drea 21, alteris circa 28 ad 2Q qniria q)oro- 
rxmi in una serie contineniibus ; sulco anali longo, oblique descendente, pjrofundo, ano 
ad terniinationem superam silo ; aperlura, antero-centrali, paulo immersa, margine 
tenui aliquanto elcvato atque lobis quiuque crassis, quorum duobus antids ceteris 
rnajoribus, circumduta ; andmlacris oralibns distinclis, pwris in quaqiie serie dis- 
tant ibus, sed inter se ajtproximatis. 
This is closely allied to the previous species, differing from it by having the 
sides of the test very gradually sloping towards the angulated periphery, 
the apex more anterior, the anterior petalum sub-equal to the postero-laterals, the 
anal furrow longer and more sloping, and the lower surface less excavated ; the 
( ) 
T 
