A manual of the Mollusca, or, A rudimentary treatise of recent and fossil shells . STRUCTURE AND PHYSIOLOGY OP THE MOLLUSCA. 53 have a pair of eyes, situated near the labial tentacles (fig. 30*, e\which are lost at a further stage, or replaced by numerous ru-dimentary organs placed more favourably for vision, on the bor-der of the mantle. Most of the aquatic gasteropoda are very minute whenhatched, and they enter life under the same form,—that which. Fig. 30 *. F)y of the Mussel* has been already referred to as permanently characteristic of thej)teropoda. (Fig. 60.) The Pulmonifera and Cephalo
A manual of the Mollusca, or, A rudimentary treatise of recent and fossil shells . STRUCTURE AND PHYSIOLOGY OP THE MOLLUSCA. 53 have a pair of eyes, situated near the labial tentacles (fig. 30*, e\which are lost at a further stage, or replaced by numerous ru-dimentary organs placed more favourably for vision, on the bor-der of the mantle. Most of the aquatic gasteropoda are very minute whenhatched, and they enter life under the same form,—that which. Fig. 30 *. F)y of the Mussel* has been already referred to as permanently characteristic of thej)teropoda. (Fig. 60.) The Pulmonifera and Cephalopoda produce large eggs, con- * Fig. 30*. Fry of mytilus edulis, after Loven. e, eye ; <?, auditorycapsule; /1, labial tentacles; s s, the stomach; b, branchite; //, heart; v,vent; I, Uver; ;•, renal organ ; a, anterior adductor; a\ posterior adductor;/, foot. The aiTows indicate the incurrent and excm-rent openings; betweenwhich the margins of the mantle arc united in the fry. 54 MANUAL OF THE MOLLUSCA.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmollusks, bookyear185
