36 FAUNA OF BALUCHISTIN. 



The peristome is transversely elliptical ; the lower lip projecting. The fasciole 

 is well developed and peripetalous, rather narrow, and crowded with rows of fine 

 granules. 



The ornamentation is rather peculiar and gives the test a corroded appearance ; 

 it consists of small tuhercles sunk into deep and wide scrobicules, which are sur? 

 rounded by a smooth rim ; as the tubercles are very closely set, the rim of each 

 is pressed by the surrounding ones into a subhexagonal shape. On the upper sur? 

 face the tubercles above the fasciole are much smaller than below it, where tl^ey 

 increase in size towards the ambitus. On the lower surface they are largest on the 

 lateral interapibulaoral areas ; on the plastron they are a little smaller, and increase 

 in size radially from the blunt plastron point, which is covered with minute tubers 

 cles only ; the ambulacral areas are set with much smaller tubercles. 



Locality an4 stratigraphipal pqsition. — rUpper cretacisous series, horizon 4, 

 Pes valley. 



Remarks. — The nearest relation to this species is ^emiaster punctatus, d'Orb.» 

 from the upper cretaceous series of the Pyrenees. But the chief distinguishing fea? 

 tures of Kemiaater blanfordi are its more inflated test, and its peculiar ornamentation, 

 the tubercles being much more closely se|;, and p|ressing pn eg,ch other, t|jus defoynjf! 

 jng the circul3.r shape of the scrobicules. 



Hemiaster oldhami, spec. nov. PI. VIII. fig. 4i.4d, 5-5A, 6, 7. 



Not one of the specimens is sufficiently well preserved to allow accurate mea-r 

 surements being taken ; the thin test is of moderate size, the largest specimen being 

 about 35 mm. in length ; it is certainly longer than broad, and broader than high ; 

 its shape is broadly cordiform, being broader in front than behind, where it is 

 acuminate; posterior margin slightly truncated. Upper surface not very much 

 inflated, slightly depressed ; lower flat ; ambitus rounded. Unfortunately no exact 

 yiew of the profile line can be obtained, but it seems that it slopes backwards and 

 forwards rather rapidly with the same inclination. The apical disc is slightly 

 behind the centre, apparently very small, not well seen in any of the specimens. 



The anteal sulcus is rather deep on the upper surface, but gradually becomes 

 shallow at the ambitus, so that it hardly indents the anterior margin. 



The single ambulacrum lodged in the anteal sulctig is rather short and not 

 closed at the end 5 tlie poriferous zones are very narrow, and are composed of small 

 holes arranged in oblique pairs. 



The anterolateral ambulacra, in deep, rather broad grooves, are tjoWably long 

 and form an angle of about 336° ; they ai;e slightly sinuous and nearly closed at the 

 end. The rather broad poriferous jzones are composed of elongated, slit-Like pores 

 which are arranged in horizontal, non-conjugate pairs ; the ridge separating two pair? 

 is lined with a row of minute granules. The interporiferous zone is considerably less 

 broad than the poriferous zones. The postero-lateral ambulacra which are consider-, 

 ably shorter than the others, diverge at ^n angle of about |i5°^ they are also lodged 



