14 LOBAT^. 



Suborder LOBAT^ Esch. 



Lohalm Esch. Isis., p. 741. 1825. 



Lohake Agass. Cout, Nat. Hist. U. S., III. p. 289. 18G0. 



Mnemiidce Esch. Sjst. d. Acalephen, p. 29. 1829. 



In the LobatiB we find that the diameter pas.sing through the ten- 

 tacular apparatus is invariably the smaller, while the compression of 

 the spherosome is in the plane at right angles to it. This is reversed 

 in the Saccatte. The spheromeres at the extremity of the longer trans- 

 verse axis, the coeliac axis, develop into lobes. 



Family BOLINID^ Agassiz. 



Bolinida Agass. Cont. Nat. Hist. U. S., HI. pp. 200, 289. 1860. 



The family of Bolinida? has here a somewhat different circumscrip- 

 tion from that ascribed to it by Professor Agassiz in his " Contribu- 

 tions." The genus Lesueuria, of which no species was known on our 

 coast in 1860, has been removed from the Mnemiida3 to the Bolinidce. 

 It is evident from the description hereafter given of Lesueuria, that 

 this genus is only a Bolina with diminutive lateral lobes. The genus 

 Mnemiopsis also is shown to belong to the Boliuidoe, and not the 

 MnemidjB. 



BOLINA Mert. 



Bollna Mert. Mem. Acad. St. Petcrsb., H. p. 51.'?. 1833. 

 Bolina Agass. Mom. Am. Acad., IV. p. 349. 1849. 

 Bollna Agass. Cont. Nat. Hist. U. S., HI. p. 249. 1860. 

 Mnemia Saus (non E.sch.). Boskriv., p. 32. 1835. 

 Alcinoe Less, (non Rang). Zooph. Acal., p. 88. 1843. 

 Anais Less. Zoopb. Acal., p. 101. 1843. 



Bolina septentrionalis Mert. 



Bolina srplentrionnns Mert. (non Aga.'is.). Acad. St. Petersb., p. 515, PI. VH. 1833. 

 Bolina siptcnirionalis Less. Zooph. Acal., p. 83. 1843. 



Off Matthaji Island, Behring's Straits (Mertens). 



