EXPLANATION OF THE PLATES. 309 



99. Jantliina. (After Quoy and Gaimard.) a, float ; &, 



eggs ; c, branchitie ; </, tentacles, .... 124 

 100. Egg^of Bulimus ovatus, Miill. Brazil, , . .123 



1. Capsules of Fulgiir carica (Am. Marine Conch., t. 5, f. 



30) 119 



2. Capsules of Sycotypns canaliculatus. (Ibid. f. 2T), . 119 



3. Eggs of Ranella ventricosa, Brod. (After d'Orbigny), 119 



4. Ova capsules ofBuccinumundatum, Linn. (Woodward), 119 



5. Egg capsule of Neptunea Norvegica, Chemn. (After 



Howse), 119 



6. Capsules of Urosalpinxcinerea, Say. (After Stimpson), 119 

 Y. Capsules of Fasciolaria tulipa, Linn. Original, . 119 



Plate 18. 



8. Genitalia of Helix albolabris, Say. (Leidy, in Binney's 



Terr. Moll., i, t. 6, f. 3). i, Testicle ; 2, epididymis ; 

 ^*, vas deferens ; ^**, its dilated commencement ; 3^ 

 accessory gland of epididymis ; ^, prostate ; <5, penis; 

 5, prepuce ; 7, retractor muscle ; 8^ ovary ; P, oviduct ; 

 iO, genital bladder ; ii, muscular organ on its duct ; 

 i^, cloaca, 119 



9. Dart of Helix vermiculata, Miill, greatly magnified. 



(After Weigmann.) The cross-section 6, is taken 

 from the point marked a, . . . . .119 



10. Dart of Helix intertexta, Binney. (Leidv, Binney's Terr. 



Moll., t. 12, f. 3 , . . . ." . . .119 



11. Branchial uterus of Unioochraceus, Say. (Lea's Observ., 



ii, t. 15, f. 44), 24, 131 



12. Egg-cases of Loligo punctata, Les. Original, . . 114 



13. 14. Egg-cases of Sepia officinalis. (Fer. et d'Orb.), . 113 



15. Shell-nidus and eggs of Argonauta Argo. (Fer. et 



d'Orb.), 31, 144 



16. Paludina vivipara, Linn. (Fischer.) The internal 



organs are seen through the shell, the distended ovary 

 full of eggs and embryos, the branchia, and between 

 these two organs, the termination of the alimentary 

 canal, ......... 12t 



l"!. Sexual organs, etc., of Pecten glaber. (Lacaze-Duthiers.) 

 o, p (male), p' (female) genitalia; r, r', genital canal 

 and its opening; ^, it, Bojanus organ, and opening; 

 i, adductor muscle ; /", rectum and anus ; 6, branchiae ; 

 a", eyes ;?, foot, . . , . . . .124 



