SPOROZOA 43 



when they are called sporonts and live in the open spaces of the organ 



to the walls of which they have been attached; body in most cases 



made up of two or three parts (Fig. 65), the epimerite at the forward 



end, which is the organ of attachment of the cephalont and may be 



dropped by the sporont, and the body, which may be divided by a septum 



into the deutomerite which forms the bulk of the body and contains the 



nucleus and the protomerite which lies between it and the epimerite: 



about 300 species grouped in 2 suborders. 



Key to the suborders of Gregarinida: 



fli Gregarines with an epimerite, and with or without a septum between the 



deutomerite and protomerite 1. Cephalina 



fl2 Gregarines without epimerite and consisting of a single chamber. 



2. ACEPHALINA 



Suborder 1. CEPHALINA. 



Gregarines possessing an epimerite at ^ y»-,^s»^ 



some stage of their life which is sunk M"^ M^SSml 



into the walls of the organs of the fe^a BSS^^KSSil B 



host in which they live; body usually elon- 

 gate, the animals being often in associated ^•'••'''^ 

 couples or groups arranged tandem, in ^^' 

 which ease the first individual is called the li^i, 

 primite and the others the satellites: in [nSl _ 



arthropods as adults, especially in the intes- \^pr 

 tine of myriapods, beetles and Orthoptera; A 



10 families and about 100 species. r«m'^(DVefnTT'"?wS^?ndt 



Key to the families of Cephalina here ^e''^tA\:ntfrn7merB%7s^^^^ 

 described: ^' ^P^'"^' 



Ui Spore more or less ovoid 1. Gbegabinidae 



Oa Spore not ovoid. 



hi Epimerite asj' mmetrical 2. Dactylophobidae 



&2 Epimerite symmetrical. 



Ci Spore sj-mmetrical, animal solitary 3. Actinocephalidae 



C2 Spore asymmetrical. 



di Spore crescent-shaped ; animal solitary 4. Menosporidae 



dj Spore ovoid with polar thickening ; in marine annelids .. 5. Doliocystidae 



Family 1. GEEGAEINIDAE.* 

 Individuals either associated, forming a chain with a septum sep- 

 arating each two individuals, or solitary; epimerite simple and sym- 

 metrical: 8 genera and about 35 species. 



* See "List of the Polycystid Gregarines of the United States," by H. Crawley, 

 Proe. Acad. Nat. Sci., Vol. 55, p. 41, 1903. "The Polycystid Gregarines of the United 

 States," by H. Crawley, same, p. 632. "Movements of the Gregarines," same. Vol. 57, 

 p. 89. "Study of Some Gregarines," etc., by M. C. Hall, Stud, from Zool. Lab. Univ. 

 Neb., No. 77, 1907. "The Polycystid Gregarines of the United States," by H. Crawley, 

 Proc. Acad. Nat. Sci„ 1907, p. 220. 



