388 TESTACEOUS MQLLUSCA. 



f. 28 ... M. striatula, p. 241, t. 24, f. 29 ... M. subramosa, p. 241 

 t. 24, f. 30. 



On Mytilus (p. 243). For additional species consult Zeit. Mai. 

 1846, 1847, 1848, An. Nat. 1842, Kuster's edition of Chemnitz, 

 Kev. Zool. Cuv. 1848, 1849 (article Septifer), Krauss's Sud-Af. 

 Mol., J. Conch. 3, 4, Proc. Bost. 3, 4, D'Orb. S. Am. and Cuba 

 Shells. 



Mytilus hirsutus, p. 244, t. 24, f. 32 ... M. granulatus, p. 246, 

 t. 24, f. 33 ... M. strigatus of Hinds' MSS. 1 p. 251, t. 24, f. 34 ... 

 M. (Dreissena) leucophceatus, p. 251, t. 24, f. 31. 



On Pinna (p. 251). See, likewise, Ph. Sic. 2, D'Orb. S. Am., 

 Proc. Bost. 3, Zeit. Mai. 1852. 



Pinna saccata, p. 253, t. 24, f. 35 ... P. atropurpurea, p. 255, 

 t. 24, f. 36. 



On Crenatula (p. 256). See, likewise, Schrift. Berlin. Gesel. 2, 

 Beschaft. Berlin. 3, Savigny's Egypt, Mol. pi. 12, and Zeit. Mai. 

 1851. 



On Perna (p. 257). See, likewise, Krauss' Sud-Af., Wieg. Arch. 

 1837, Proc. Bost. 2, 3, and D'Orbigny's Cuba Shells. 



Perna costellata, p. 259, t. 24, f. 37. 



Malleus alius, p. 260, t. 24, f. 38. 



On Avicula (p. 261). See, likewise, Zeit. Mai. 1848, 1849, 1851, 

 1852, Proc. Bost. 3, 4, and D'Orb. Cuba Shells. 



Avicula semisagitta, p. 261, t. 24, f. 39. 



On Meleagrina (p. 264). See, likewise, Zeit. Mai. 1849, 1852, 

 Sw. Z. I. s. 2, t. 55, and D'Orb. Cuba SheUs. 



Meleagrina Mazatlanica (t. 24, f. 40). Large, solid, subven- 

 tricose, more or less oblique, more or less projecting behind ven- 

 trally, longer than broad, squarish above in front ; rounded ventrally, 

 yellowish olive, with rather faint pallid rays ; the rather distant con- 

 centric lamellae somewhat closely fringed with moderately large 

 peaked concave vandyked scales ; ventral edge much arcuated, rising 

 in front ; anterior margin not retuse, but either straightish or 

 convex, forming nearly a rectangle with the rather short straight 

 and rising dorsal line ; hinder gape ample, the posterior dorsal 

 incurvation being full, and the auricle rather large and deep ; nacre 

 bluish white, broadly edged with the external colouring. 5... 4£. 

 Mazatlan. Distinguished from margaritifera by its scales, obliquity, 

 colour, and by not being retuse in front. 



1 Was designed by Hinds to have been published in the Zoolo- 

 gical Proceedings, but his intention was not carried into execution : 

 it has been subsequently termed falcatus by D'Orbigny (S. Am.). 



