FAMILY SPHAROMIDA. 87 
Spheromini the females have no notch at the end of abdomen 
and the mouth-parts normal as in the males, while in Cymo- 
docini the same sex has a distinct, most frequently bilobed 
notch at the end of abdomen, and the mouth-parts metamor- 
phosed; it may be added that no other distinguishing character 
between the two sections could be discovered. In the 
eubranchiate Spherominz the case is more difficult. In this 
group the end of abdomen is a little emarginate in one genus, 
Cassidinopsis (n. gen.), in all other genera furnished with 
a notch of very different shape; in some of the genera the 
female mouth-parts are normal, in others highly metamor- 
phosed. Nevertheless, there is evidently a connection be- 
tween the presence of metamorphosis of the mouth-parts and 
the development of the abdominal notch. In the female 
Dynamene bidentata (Mont.), and especially in another 
species of the same genus, a species constituting a transition 
stage to Nesicopea (Stebb.), the mouth-parts are meta- 
morphosed and the abdominal notch very deep and looking 
much upwards (it is, besides, widened at the bottom and very 
constricted in the distal part) ; in Cerceis(M.-Hdw.) the notch 
is rather deep and turned upwards, in Paracerceis (n. gen.) 
moderately large and deep and turned backwards, but the 
end of abdomen is somewhat produced. In both these genera 
the mouth-parts are metamorphosed. In Scutuloidea (Chilt. ) 
the notch is less deep than in the preceding genera, in 
Cassidinopsis emarginata (Guér.) only a rather slight 
emargination is found ; in both these genera the mouth-parts 
are normal; inafemale of Amphoroidea falcifer (Thoms) 
with the marsupium well developed, but without brood, the 
mouth-parts are normal and the notch as in Scutuloidea. 
Difficulties are found in Cymodocella (Pfeff.) and Dyna- 
menella (n. gen.) ; in the former genus the notch is very 
well, though peculiarly, developed, and the mouth-parts 
normal; in Dynamenella the female notch is about as in 
Paracerceis, but the mouth-parts seem to be normal. for 
want of material I cannot further prosecute this topic, but in 
spite of the difficulties mentioned it can be stated that in the 
