PLATE IX {continued). 



19. — Valutina levigata. Belonging to Naticidae. Median reflexed, multi- 

 cuspid, central one of which is much produced. 1st lateral 

 turned to median, multicuspid, the inner cusp much produced ; 

 2nd and ord simple, hook-shaped. Two rows of laterals seen. 



19«. — Mandible divided, and forming two plates of divergent rows of acutely 

 pointed teeth. 



20. — Aporrhais pes-peliccDii, Vigo Bay. Placed by Forbes with Cerithiadse; 

 clearly an error. Median subquadrate, reflexed, seven-cuspid ; 

 centre one prolonged. Laterals simple, hooked teeth, very long 

 and slender, closing over median. 



21. — Octopus vulgaris, Vigo Bay. Median much produced, cuspid, centre 

 one long and acutely pointed, wliile that on either side is much 

 subdued ; articulated with each other like the bones in the vertebral 

 column of vertebrates. 1st lateral shnilar, but much smaller, 

 cusps looking inwards ; 2nd lateral similar, but large and broad ; 

 3rd lateral slightly curved inwards, and set in membrane like a 

 thorn on stem of rose. Two rows shown. 



22. — Sepia officianalis, Brit. Median simple, slightly hooked. 1st and 2nd 

 laterals similar; 3rd lateral much larger and bolder, claw-like. 

 From ]\Ir. F. Walker's collection. Sepiolia atlantica, a small 

 inferior specimen, being the only one in the Woodwardiaa 

 collection. 



23. — Ampullaria nrceus, Trinidad. Median broad, subquadrate, or boat- 

 shaped, reflexed, seven-cuspid ; central cusp strongly apical, on 

 either side three smaller cus])s. 1st lateral broad, reflexed, cuspid ; 

 centre one prolonged, with two shorter on either side. 2nd and 3rd 

 simple, claw-shaped. 



24. — A. effusa? Brazil, so very nearly resembles the former that the same 

 description applies to it. 



25. — Carinaria cristata. Median reflexed, tricuspid. 1st lateral a trans- 

 verse plate, with a slightly hooked apex turned to base of median; 

 2nd and 3rd simple, sickle-shaped. 



26. — Cassis sabaron. Median subquadrate, multicuspid, decreasing in size 

 from central cusp. 1st lateral hooked, denticulate ; 2ud lateral 

 denticulate, produced towards base; 3rd lateral simple, sickle- 

 shaped. 



26«. — C. sabaron. Mandible divided, covered with fine spines, 



'iH.—Loligo media., Tenby. Median bold, and produced at base; tricuspid, 

 centre one long and acutely pointed, while that on either side is 

 much subdued. 1st lateral similar, looking inwards ; 2nd and 3rd 

 laterals hooked or simple. 



28. — Cyproea Arabica. Median broad, subquadrate, reflexed, cuspid; 

 central one longest, and two much subdued on either side. 1st lateral 

 hook-shaped, cusp prolonged; 2nd and 3rd simple, hooked. Half 

 only shown in drawing. Somewhat more closely resembles Cyclos- 

 toma than that of its congener. 



29.— (7. Europaa, Galway Bay. Median cuboidal, produced base, reflexed, 

 multicuspid ; centre cusp longest, with three or four smaller ou 

 either side. 1st lateral denticulate; 2nd and 3rd simple, hooked. 



'i{).—Cilhara [mangelia) gracilis. Specimen imperfect. Median probably 

 lost in mounting. Lateral simple, slender tooth, ternunating iu a 

 dilated base, which is firmly set in membrane. 



