OF WESTERN SIND. 69 



The rosette is moderate in size ; and the anterior odd ambulacrum is characterized 

 by its open extremity, large interporiferous zone, straight inner line of pores, and the 

 curved outer lines. The antero-lateral ambulacra are smaller than the others, and do 

 not reach halfway to the margin. The posterior ambulacra are longer than these last, 

 ■ have a narrow interporiferous zone, have the posterior poriferous zone slightly smaller 

 than its fellow, and they terminate more than halfway from the apical disk to the trans- 

 verse process above the periproct. All the ambulacra are well open at their ends ; and 

 the straightness of the inner lines of pores is very characteristic. There is a rounded 

 keel over and in front of the transverse oval periproct, which is in a broad shelving 

 groove. 



The floscelle of the peristome is highly developed ; and the cribriform structure of 

 the median line is evident, being bounded by a larger ornamentation than exists on the 

 abactinal surface. The large ornamentation consists of tubercles in broad scrobicules, 

 separated by ridges ; several of the tubercles are on one side of the scrobicule. 



Length of specimen ^ inch, breadth ^ inch, height not quite f inch. 



Locality. In the Eanikot series, north-east of Petiani, west of Kotri. Survey- 

 number G xf f • 



Illustrations of the Species in Plate XV. 

 Pig. 5. The test, from above : natural size. 



6. Part of the phyllode and pitted structure : magnified. 



Genus EURHODIA. 



Eurhodia, d'Archiao Sf ITaime, Aniniatuv fossiles de I'Tnde, p. 214. 



The superior petals are small, almost closed, and have unequal poriferous zones ; 

 the buccal petals are closed, subequal, and have their inner pores double. The peri- 

 stome is surrounded by slight and unequal tuberosities ; and the periproct is supramar- 

 ginal, and opens into a slight depression ; it is large, ovular, and elongated trans- 

 versely. 



This diagnosis was founded in order to separate Eurhodia from some other 

 Cassidulids, and especially those of the genera Pygorhynchus and Rardouinia. It was 

 the result of the study of specimens which were small and had the peristome incom- 

 pletely shown or badly preserved. Two species were recorded, one Eurhodia Morrisii, 

 which replaced Pygorhynchus Morrisii, d'Archiac, and Eurhodia Calderi, Haime. 



The first of these is carefully described by d'Archiac and Haime in their ' Ani- 

 maux Fossiles,' p. 214, but not from one good or a large series of good specimens. 

 Hence the correct shape of the test and many specific points are not recorded, and their 

 specific determination becomes almost generic in its value. Moreover the type of the 

 distinguished authors was not full-grown by one third. 



Some thirty-five specimens were collected in the Eanikot series ; and as most of 

 them are in good condition, many points of structural importance can be elucidated, 

 and the specific characters slightly amended. But the generic attributes are not cor- 



L 



