STBININA. 107 



knob-like, and caducous ; but the species cannot be definitely 

 placed in that genus until the dehiscence of the cyst and the 

 form of the sporocysts has been observed. 



Habitat. — Intestine of the prawn, Parapeneopsis sculptilis 

 (Heller) : Bombay, Bombay. 



3. Family ACTING CEPHALID^ Leger, 1892. 



Sporonts always solitary. Epimerite symmetrical, simple 

 or with appendages. Gametocysts dehisce by simple rupture. 

 Sporocysts irregular, biconical or cylindrical, with conical 

 extremities not provided with bristles. 



Genus STEININA Leger & Duboscq, 1904. 



Steinina, Leger & Duboscq, 1904, p. 352 ; Watson, 1916, p. 256 ; 

 Kamm, 1922, p. 79 ; Wenyon, 1926, p. 1151 ; Reichenow, 1929, 

 p. 900 ; Kudo, 1931, p. 298 ; Calkins, 1933, p. 562. 



Epimerite a short, mobile, digitiform process, changing into 

 a flat crenulate disc. Sporocysts biconical. 



40. Steinina metaplaxi Pearse. (Fig. 41.) 



'^Steinina metaplaxi, Pearse, 1933, p. 293, fig. 3. 



Body robust, somewhat flattened. Epimerite nearly spheri- 

 cal. Protomerite wider than long, rounded anteriorly. 

 Deutomerite rectangular, Avith rounded angles. There is 



Fig. 41. — Steinina metaplaxi Pearse. (After Pearse.) 



a heavy pellicle around the protomerite and the deutomerite. 

 Nucleus elHpsoidal, longest axis Ij^ng across body, situated 

 usually at end of anterior third of deutomerite, but the position 

 varies. Syzygy apparently does not occur. 



Dimensions. — Spdront, length 40-60 /i, breadth 18-20ju, ; 

 protomerite 16/i by lOju, ; deutomerite 25ju, by ISjit ; nucleus 

 6/a by 7 /A. 



