14 LOBAT^. 



Suborder LOBAT^ Esch. 



Lobatce Esch. Isis., p. 741. 1825. 



LobatCB Agass. Cont. Nat. Hist. U. S., III. p. 289. 1860. 



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



In the Lobat» we find that the diameter passmg 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 SaccataB. The spheromeres at the extremity of the longer trans- 

 verse axis, the coeliac axis, develop into lobes. 



Family BOLINID^ Agassiz. 



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



The family of Bolinidse 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 Mnemiidoe to the Bolinidte. 

 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 BoUnidaB, and not the 

 Mnemidas. 



BOLINA Mert. 



Bolina Mert. Mem. Acad. St. Petersb., H. p. 513. 1833. 

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

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

 Mnemia Sars {non Esch.). Beskriv., p. 32. 1835. 

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

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



BoUna septentrionalis Mert. 



Bolina septentrionalis Mert. {non Agass.). Acad. St. Petersb., p. 515, PI. YTL. 1833. 

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



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



