202 Miss Catherine A. Raisin — 



interstices are recognizable (Fig. 8&), possibly modified by minute 

 parallel fissures. When crushed obliquely the ridges have been 

 compressed into sharp thin ledges, and pushed back one on another. 

 The umbonal part is like a small Asiarte, such as A. sulcata, 

 Da Costa, and another -small species occui-ring in these same 

 Brazilian strata, A. fl(/rana,/A\C. White. ^ The boss is sometimes 

 found by itself ; the flatter, thin, outer, marginal, flange-like portion 

 having been shifted away. In the usual soft light-brown shale ; 

 from a cutting at kilom. 83 from Bahia between Pojuca and 

 S. Thiago, with E. expansa, and between Sargiva and Pojuca. 



EXPLANATION OF PLATE VIII. 



Fig. 1. — Estheri'ina Bresilieiisis, gen. et sp. nov. : a, right-hand valve, X 5 ; 



b and e, ridges and interstitial ornament, X 100 — one {b) near the middle 



of the valve, the other {c) low down near the ventral margin. Brit. Mus. 



Nos. 13, 37, 371, 372. 

 Fig. 2. — The same species : a, right-hand valve, X 5 ; 5, ornament, X 100. 

 Fig. 3. — The same species : dorsal aspect, X 4. 

 Fig. 4. — The same species : front end, x 4. 

 Fig. 5. — The same species : the two valves lying open, X 5. 

 Fig. 6. — Estheriina expansa, sp. nov. : «, right-hand valve, X 3 ; 5, surface 



ornament, x 75. Brit. Mus. No. L. 304-4. 

 Fig. 7. — Esthernna astartoldes, sp. nov.: right-hand valve, X 10. Brit. Mus. No. 



L. 304-3, L. 304-4, L. 304-5. 

 " Fig. 8. — The same species : a, right-hand valve, slightly distorted, X 10 ; b, surface 



ornament. 

 Fig. 9. — Estherima Freysteini (after Geinitz, 1855) : right-hand valve, nat. size. 

 -Fig. 10. — The same species (after Geinitz, 1879) : right-hand valve, nat. size. 

 Fig. 11. — Estheriina limbata (after Goldenberg, 1877) : left-hand valve, X 5. 



III. — On a Hornblende-Picrite from the Zmutthal (Canton 



Valais). 

 By Catherine A. Raisin, B.Sc. 



WHILE staying at Zermatt in the summer of 1894, I searched 

 among the boulders from the Zmutt glacier for several types 

 of rock, which, as suggested to me by Professor Bonney, were 

 likely to occur. I am further indebted to him for kindly giving 

 me his help and opinion on several questions while I was writing 

 this note. 



One specimen which I collected proves to be rather different 

 from the rocks recorded from that district, and has points of interest. 

 The boulder was rather large (roughly about 2 feet across), and it 

 lay by the side of the path, on the right bank close to the glacier 

 near its termination, where the moraine material is thickly heaped 

 upon the ice, and many boulders are strewn along the side. 



The rock is blackish, with scattered specks of a soft white 

 mineral, and with glittering cleavage surfaces of crystals which 

 appear lustre -mottled. It attracted my notice from its resemblance 

 to a picrite, and especially to the Peuarfynydd rock. 



1 The subtrihedral shape of these Astartes is -wanting here, and they are too 

 large. Astarte agraria measures 20 mm. x 19 mm., and the thickness of the 

 carapace is 12 mm. A. ccelata, Miinster, about 5mm. long; A. planissima, 

 Forbes, has definite Molluscan characters, and is about 12 mm. long. 



