or SOUTHERN INDIA. 4.3I 



PECTEX, Klein, 1753, (see p. 421). 

 1. Pecten Axap.yudiensis, StoUczka, PI. XXXII, Pig. 1, & PI. XL, Fig. 6. 



181.6. Pecten ohliqutis, Sow., apud Forbe.";, Trans., Geol. Soc, Lond., vii, p. 151 — non idem Sowerb}'. 



P. testa oi-ata, paulidum ohliqua, incequivalm, vulva sinistra convexiore, costis 

 radiantihus fortiovibus ct (\-2,) tenuiorihus intoyositis, squamosa tuhercidatis, oniata, 

 rah-a dextra plaHiuscida, radiatim suh-a^quaUtef dense costata et conccntrice squamose 

 costeUata. 



This species is closely allied to the European Feet, obliqmts, with which it Avas 

 considered identical by Forbes, but it differs in the character of the ribs. On the 

 left valve, which is somewhat more convex than the right, there are 1-3 thinner 

 ribs between each two stronger ones, but they do not differ so much in strength as 

 in obliquKs. On the right valve the difference in the strength of the radiatins ribs 

 is still less marked, and the concentric lamellar strite, or sharp ribs, are closer 

 together than on the left one. The cast has only slight indications of the ribs. 



In Forbes' original specimen (pi. xl, fig. 6,) the concentric strite have become 

 obsolete between the radiating ribs, and are indicated only by small scaly tubercles 

 on them. 



Zocaliti/. — East of Anapaudy, in a brownish sandstone. 



Formation. — Trichinopoly group. 



2. Pecten raduloides, Stoliczka, PI. XXXI, Fig. 20, PI. XXXII, Figs. 2—3, and 



PI. XLII, Fig. 6. 



Feet, testa oblique sub-orbiculai'i, postice lateraliter sensim dilatata, cequivalci, 

 raids panlo convexiuscidis, radiatim costulatis et concent rice sub-obsolete striatis, 

 costulis Ixecigatis, sub-undulatis, in speciminibus junioribus cequalibus, depressiusculis, 

 (Bquidistantibus, in adultis alteris tenuioribus intcrpositis, in declititate postica fere 

 omnino obsoletis ; aiiricuUs sub-cequalibus, postica ralde obliqua, antica truncata, 

 in valva dextra ad basin insiniiata. 



This is a very characteristic oblique species, in general form somewhat resem- 

 bling a Badula, having the posterior side sensibly expanded. In young sj)ecimens 

 the ribs arc equidistant, smooth, depressed, and of equal strength; in older ones they 

 alternate with thinner ribs, being always slightly undulating, and on the posterior 

 declivity generally obsolete. As a rule, the ribs are equally well marked on both 

 valves, but in some specimens they are a little less developed on the left, and when 

 on this one the outer layer is not well preserved, they occasionally become hardly 

 traceable (see fig. 3 on pi. xxxii). The species is closely allied to the European 

 F. undulatus, apud Goldf., but apparently somewhat more oblique, not so wide, 

 and with more distinct radiating striation. I can hardly believe that Goldfuss' 

 species can be the same as that described by Nilsson in 1827 under the same 

 name ; the figures of both are entirely different. 



Localities. — South-west of Mulloor, west and sovith-east of Arrialoor, near 

 Kara^iaudy and near Veraghoor, in whitish or reddish sandstone. 



Formation. — Arrialoor group. 



