EXPLANATION OF PLATES. 375 
which the ova (eggs) are conveyed from the ovarium, o.; the 
orbicular muscle, with its double fringe, within the orbicular 
muscle, m.o.: the mantle is furnished with a vast number of 
monogastric muscles, terminating in tendons, all of which ter- 
minate at one pot, pl.m.r. The orbicular muscles of the 
right and left sides are joined posteriorly, m. 0.7. p., at the point 
where the branchiz terminate. 
For all the letters referring to the parts of the animals and their 
shells in this Plate, see the preceding Explanation. 
PLATE Vee: 
This Plate represents Anomia Ephippium and its most essential 
parts. 
Fig. 1. Represents the left valve of the shell, the right valve being 
removed: this shows the animal entire in its natural position. 
L.i. The internal ligament: m.a.a. the anterior closmg muscle ; 
m.a.p. the posterior closmg muscle ; pl. the mantle. 
Fig. 2. Represents the same animal, the right part of the mantle 
bemg removed: 6. the branchiz; c. the heart; pl. the mantle; 
z.r. the intestinum rectum, or terminal intestine. 
Fig. 3. Represents the right valve, containing the animal entire, the 
left valve being removed: maa.spp.a supplementary muscle 
closing the shells; pl. s. the left lobe of the mantle; pl.r. the 
right lobe of the mantle; h.r. the region of the liver. 
For all the letters referring to the parts of the animals and their 
shells in this Plate, see the preceding Explanation. 
PLATE VI. 
Fig. 1. Sepiola Rondeletii, under view. 
Fig. 2. Sepiola Rondeletu, upper view. 
Fig. 3. The bone of Sepiola Rondeleti, magnified ; its natural length 
is indicated by the little line by its side. 
Fig. 4. Loligo parva, upper view. 
Fig. 5. Loligo parva, under view. 
Fig. 6. The bone of Loligo parva, of its natural size. 
Wherever the little line in any of the Plates is omitted, the objects 
represented are drawn of their natural size, unless otherwise speci- 
fied. 
PLATE VII. 
Fig. 1. Doris Elfortiana. Fig. 2. Tritonia Hombergii. 
Fig. 3. Eolidia Cuvieri. Figs. 4 & 5. Cleantus Montagu. 
Figs.6 and 7. Shell. — Fig. 8. Esmia Griffithsiana. 
Figs. 9 and 10. Shell. Fig. 11. Roseania Cranchii. 
