MARINE MOLLUSGA. 601 
truncata, ad latera carinata et lamellata; pes infra orem leviter sinuatus, ad angulos rotundatus, 
extensionibus lateralibus semicircularibus, sed in exemplo singulo supra tergum reflexis ; testa minima, 
ad extremitatem corporis posticam posita, cute tenuissima tecta, tenuis, semipellucida, supra convexa, 
semiconvoluta, postice acuminata, striis incrementi tenuibus sculpta; branchiae plumiformes, multi- 
Jamellatae, sensim versus extremitatem attenuatae, infra testam sitae. Longit. tota 17 wmillim. 
Discus capitalis 7 longus, 4 latus. Diam. lobis pedis expansis 12 millim. Testa 4 longa, 21 lata, 
Closely allied to C. smaragdinus, Leuckart, and differing only in the form of the shell. This 
is exactly the same as that erroneously figured by H. and A. Adams in the Genera of Recent 
Mollusca, vol. 11. Pl. tvin, figs. 3a, 36, as Chelidonura hirundinina of Quoy and Gaimard. A 
comparison of these figures with those of Leuckart' and Ehrenberg? at once shows the considerable 
difference in form. 
The shell of Crypt. Juteus, Quoy and Gaimard, is more like that of the present species, but 
the short folds on each side of the head-shield do not appear to be present in that species, at 
all events they are not referred to by the authors. The most remarkable character in this species 
consists in the structure of the cephalic disc. It is, as it were, in two parts, the one superimposed 
upon the other. The anterior portion is shield-shaped, being broad, truncate, and double-edged in 
front, and narrowed behind. The converging sides are not, however, united posteriorly, but form 
very small lobes, attached to the hinder portion of the disc. The latter is squarely truncate behind, 
keeled at the sides, and exhibits beneath the carinate margins about fifteen short oblique lamellae. 
This is a very striking feature, and occurring in C. smaragdinus, makes one doubtful whether 
the present species, although the shell is very different, is really specitically distinct. 
Family CONIDAE. 
12. Conus arenatus, Hwass. 37,7. VIII, IX, XI, XII, XIV, XV. 
13. Conus betulinus, Linn. 37, 7. (C. medusa, Gmelin, 16) IX, XI. 
14. Conus catus, Hwass. 37, J. (var.=C. discrepans? Sowerby, 40, a, var. = CU. adansoni, 
Reeve (now Lamk.), 37, /., var.=C. nigropunctatus, Sowerby, 40,0, ///.) IX, XV. 
15. Conus ceylonensis, Hwass. 37, J. (var. =C. pusillus, Chemnitz, 37, Z., var.=C. nanus, 
Broderip, 37, 7.) IX. 
16. Conus distans, Hwass. 37,7. (C. mennonitarwm coronatus, Chemnitz, 9) IX. 
17. Conus eburneus, Hwass. 37,7. IX, XII, XV. 
18. Conus ermineus, Born. 40, /, ///. (C. lithoglyphus, Meuschen, 37, J. C. orleanus, Bolten, 
30, var.=C. lacinulatus, Kiener, 23, var.=C. carpenteri, Crosse, 11, a) IX. 
19. Conus flavidus, Lamarck. 37,/. (C. maltzanianus, Weinkaufl, 43, var. granulata=C. 
frigidus, Reeve, 37, 1., var.=C. neglectus, Pease, 31,5) XV. 
20. Gonus generalis, Linn. 37, J. (var.=C. maldivus, Hwass. 37, [., var.=C. monile, Hwass. 
37, 1, var.=C. bayani, Jousseaume, 22, jun.=C. spiroglowus, Deshayes, 40,6, X//.) XIV. 
21. Conus glans, Hwass. 37, J. (var.=C. tenwistriatus, Sowerby, 40,0, ///., var.=C. fabula, 
‘Sowerby, 37, Z., var.=C. scabriusculus, Chemnitz, 9) LX. 
22. Gonus hebraeus, Linn. 37, 7. (var.=C. vermiculatus, Lamarck ; var. =C. chaldaeus, Bolten, 
30) IX. 
1 See Pilsbry, Man. Conch. vol. xvi. Pl. vi. figs. 33-34. * See Pilsbry, lc. fig. 32. 
