OF SOUTHERN INDIA. 99 



■Z. — S. Careiitonensis, Coq., is not sufficiently characterized, but judging from tlic short des- 

 cription given of it, it is likely to be a small, compressed specimen of a Siliqua or of a Pkarella. 



3. — S.? clavteformis, Giimbel; the description is quite insufficient on which to form an opinion 

 as to the true characters of the shell. 



4. — Solec. Robinaldinus, d'Orb. ; the form of the shell and that of the muscular impression 

 entirely agree with those of a Tagelus. 



5. — Solec. Warbnrtoiii, Porb., has entirely the form of a Ceratisolen. The radiating strife, how- 

 ever, recall the ornamentation of some of the species of Tellinid^e, and I do not know any species 

 of recent Solenid^E in which they occur. 



6. — Solec. Desori, Pict. and Renev. ; only known by a half of the right valve, the beaks 

 appear to be incurved toward the ligament, as in Tugelus. 



7. — Solec. aqualis, d'Orb., resembles somewhat a Pharella, but it may equally proljably be a 

 species of the Tellinid^. Reuss (Bohm. Kreid. II, p. 16, pi. xxxvi, fig. 6,) describes from Bohemia 

 a similar species which he identifies with d'Orbigny's S. aqualls, but it has the beak still more 

 central than this last, and may still more likely be a TelUnide. Miiller quotes S. eequalis, d'Orb., 

 from the Senonieu of Aachen, (Monog. Pet. Aach. Kreide., 184.7, p. 28) ; but Bosquet in his 

 catalogue of the fossil flora and fauna from Limburg (S taring's Bodem van Nederlaud, ii deel,) 

 seems to doubt the identity of the species, referred to by Miiller, with that of d'Orbigny. A 

 correct examination of all the species or specimens which have been called Solen aqnalis would be 

 most desirable and absolutely necessary for the purpose of clearing away the existing uncertainty 

 of determination. 



8. — Sol. Guerangeri, d'Orb., belongs apparently to Pharella, or possibly to Azor. Panopaa 

 sinuata, Reuss, is much of the same type. 



9. — Sol. pelagi, d'Orb., (Gueranger^ Album Paleont. de la Sarthe, 1867, jd. xv, fig. 6,) is 

 of the same type as the former. 

 ■ 10. — Sol. Acteon, d'Orb., (Gueranger, loc. cit., figs. 1-2), is probably a true Solecurius. 



II. — Sol. radians, d'Orb., {^elegans, d'Orb., non id. Matheron, Gueranger, loc. cit., 

 fig. 5,) is more probably a Gari (Psaiiimohia) , on account of the radiating lines. 



12. — Solen elegans, Math., is also more likely a TelUnide than a species of the SoleniDjE. 



13. — Sul. carinatus, Math., (Cat. Metli., &c., 1842, pl. xi, figs. 1-2,) which was transferred 

 by d'Orbigny to the genus Anafina, has entirely the form of a Ceratisolen, except that the cast 

 does not show a rib under the beaks. 



14. — Solen inflexus, Duj., appears to be very closely allied to Sol. Guerangeri. 



15. — Solen compressns, Goldf, (Pet. Germ., p. 276, pl. 159, ?i§. 4> := Sol. snh-compresms,* 

 d'Orb., non Solec. compressus. Sow.). Goldfuss' figure of this species represents a form which in 

 general shape, position and form of the muscular impressions, and the thin structure of the shell, 

 agrees with some recent species of Siliqua, such as S. radiata. No mention is made of the existence 

 of a rib below the beaks, but there seems to be an indication of it just behind the anterior muscular 

 impression. If this, however, merely represents an accidental break in the cast, the species could 

 only be referred to Pharella. Miiller's statement (Monog. Pet. Aach. Kreidef, 1847, p. 28,) is 

 not intelligible. For though he appears to regard Goldfuss' figure as correct, he says that the 

 beaks are placed so far posteriorly, that the anterior portion of the valves is double as long as the 

 posterior one; the reverse apj^ears, howevei", to be shown in Goldfuss' figure. Subsequent authors 

 do not mention anything about this discrepancy. Should, therefore, the species not be a Siliqua, 



* This change of tbe specific names is entirely uncalled for, because the generic determination of Sangninolaria 

 compressa. Sow., or of Solen compressus, Goldf., both of which d'Orbigny refers to Solecur/its, neither is, nor can, 

 according to the existing materials, be satisfactorily settled. 



