Fig. Miiller, Ueber den Bau und die Lebenserscheinungen des Bran- 

 chiostoma lubricum, 4to, 1844, taf. 1 . fig.-l . Yarrell, History of British 

 Fishes, vol. ii. fig. at p. 468. 



Hob. Seas of temperate Europe. Sandy coasts. Near Logan Rock, 

 Cornwall. Presented by Charles Fox, Esq. 



Suborder MARSIPOBRANCHII (CYCLOSTOMI, Cuv.). 



Gills fixed, bursiform, inoperculate, receiving the respiratory streams by 

 apertures usually numerous and lateral, distinct from the mouth : a heart, 

 without a ' bulbus arteriosus.' 



Family Myxino'idee. 

 Genus MYXINE, Linn. 



2. The Myxine or Hag-fish (JMyx'me glutinosa, Linn. ; Gastrobranchus 



ccecus, Bloch). 

 Fig. Bloch, Histoire Naturelle generale et particuliere des Poissons, fol. 



pi. 413. Yarrell, History of British Fishes, vol. ii. fig. at p. 462. 

 Hob. Northern and temperate seas. It is parasitic on larger fishes, 



piercing the integument by suction and penetrating into the substance 



of the flesh. 



Genus HEPTATREMA, Dume'ril. 



3. The Heptatrema cirratum, Dumeril ; Petromyzon clrrhatus, Forster. 



Fig. Miiller, Ueber die Myxinoiden, fol. tab. 2. 

 Hab. The South Seas, Pacific Ocean. 



Genus PETROMYZON, Linn. 



4. Two specimens of the smaller River or Fringed-lipped Lamprey 



(Petromyzon Planeri, Bloch). 

 Fig. Lace"pede, Histoire Naturelle des Poissons, 4to, vol. iv. pi. 15. fig. 1 . 



Yarrell, History of British Fishes, vol. ii. fig. at p. 457. 

 Hab. Freshwater streams of Europe. 



Presented by Thomas Wormald, Esq., F.R.C.S. 



5. The Lampern (Petromyzon flumat'ilis, Bloch). 



Fig. Yarrell, History of British Fishes, vol. ii. fig. at p. 454. 

 Hab. Freshwater streams of Europe. 



