PLATE LV. 

 MYTILUS CYGNEUa. 



GREAT nORSEj OR SJVAN MUSCLE, 

 GENERIC CHARACTER. 



The hinge toothless, and consists of a longitudinal furrow, 



SPECIFIC CHARACTER 



AND 



SYNONYMS, 



Somewhat oval, one end rounded, the other extended, narrow, 

 and compressed ; thin and brittle. 



Mytilus Cygneus : testa ovata anterius compressiuscula fragilis- 

 siraa, cardine laterali. Gmel. Linn, Si/st. Nat, 

 p. 3355. 15. 



Mytilus Cygneus : concha testa oblonga ovata lon^itudinaliter 

 subrugosa, postice compresso-prominulo. Linn. 

 Fn. Suec. 1. p. 380. No. 133.2. 



Musculus latus maximus, testa admodum tenui, ex fusco viridcscens, 

 palustris. LJst. yipp. II. An.Jngl. p. 8. tit. 30. 

 tab. 1. fg. 3. and J pp. II. An. Angl. in 

 Goedart.p. 9. tit. 30. tab. 1. fg. 3. — AIusculus 

 latus maximus & tenuissimus e coeruleo virides- 

 cens, fere palustris. //. Conch, tab. 156. fg. 11. 

 E 4 



