26 
CRETACEOUS ECHINODERMATA 
Catoptgtjs sulcatklltjs, Stoliczka. PI. IV, Figs. G — 7. 
C. testa siihcylindrica, modice elevata, stipra coiivexkisciila, parte posteriore 
paulo latiore atque altiore, ad terminationem truncata, stip)ra anum paiihilum pro- 
ducta, infra concaviuseule planaia ; superficie iindique dense crassiiisque (jranulifera ; 
apice valde eccentrico, antico ; ambnlacris inceqnalihus, latiusculis ad terminationes 
externas modice contractis, antico panto longiore quam diiohus antero-lateralibns, 
diiobtis qyoslicis lo7igissimis, angido 40° divei'gentibns ; zoiiis poi'iferis aliquanto de- 
2 ))'essis, sed ambulacro nnllo ad maj'ginem p)e7'ipherice extenso ; facie inferioi'e planata, 
circa apei'tnram paulnlum concaviuscnla ; apertura sub-centi'ali, late imitagoiia^ 
lobis qxtrcis tuberc^difoi'mibns cb'cumdata. 
This is one of the smallest species of Catopygus known ; it differs from all others 
by. the very eccentric position of the apex, the marked depressions of the poriferous 
zones of the ambulacra, and the comparatively strong granulation of the surface. 
The lower side is flattened, sloping towards the periphery, and round the aperture 
it is slightly depressed. The aperture is slightly less eccentric than the apex, sur- 
rounded by five small tuhcrculi-form lobes, and although its exact shape is not very well 
traceable in cither of the two specimens examined, it appears rather to extend in breadth 
than in length, the latter case being the usual one in other species of Catopygus. 
Locality. — Yermanoor, in whitish soft sandstone; apparently rare. 
Fo7'mation. — Arrialoor group. 
VI. BOTRIOPYGUS, D’Or&w, 1855. 
The species of this genus arc distinguished from allied Cassibtjlidje by a usually 
moderately depressed ovate form, being rather narrow in front and gradually broader 
towards the posterior, generally rounded, end; the apex is eccentric, anterior, the two 
posterior ambulacra often somewhat longer than the anterior, and all extend 
nearly to the periphcrical edge of the test ; the pores in each pair are unequal and 
yoked ; the anus lies at the posterior end, and is vertically ovate ; mouth eccentric, 
pentagonal, siwrounded by more or less distinct lobes, alternating with the elongate 
oral ambulacra. 
AATth one or two exceptions, all the species as yet known are from cretaceous 
deposits. 
Botriopygus sp. indet. PI. IV, Fig. 6. 
I mention under this name a very imperfectly preserved specimen of a Cassidu- 
lid which appears to belong to the present genus. The test is ovate, broader 
posteriorly than anteriorly, moderately depressed, with a roiuided periphery; the apex 
is anteriorly eccentric, and somewhat raised above the other parts of the test, as in 
some species of Fanjasia or A^'chiacia ; the two posterior ambulacra are very much 
longer than the three anterior, which appear to he sub-equal ; the pores are yoked, 
( 96 ) 
