468 F. W. GAMBLE. 



Family VORTICIDtE. 



Rhabdocoela with a common genital pore. Germaria 

 and vitellaria united or distinct. Accessory fe- 

 male organs present. Uterus simple. Testes 

 paired, compact. Mouth ventral, usually anterior. 

 Pharynx dolioform.^ Copulatory organ of various 

 shapes (v. Graff, ' Monogr./ p. 342). 



Subfamily Euvorticin.e. 



Pharynx and brain well developed. Germaria 

 small. Body-cavity extensive. Parenchyma small 

 in amount. Free-living. 



Genus 16. — Provortex, v. Graff. 

 Euvorticinse with two germaria and two distinct, 

 elongate, unbranched vitellaria. Testes rounded. 

 Pharynx dolioform. Mouth iu the anterior third. 

 Vesicula seminalis enclosed by the penis. Copu- 

 latory organ traversed by the spermatozoa (v. 

 Graff, ibid., p. 344). 



28. Provortex balticus (Schultze, 27). 



Length "6 — 1 mm. Body cylindrical, truncate in front, 

 the angles produced into blunt processes, widening towards 

 the middle and tapering behind to a long '^ tail." Colour 

 brown, due to scattered reticular pigment. Epidermis con- 

 taining flagella interspersed between tlie cilia. Pharynx 

 provided with a distinct seam, into which the pharyngeal 

 retractor muscles are inserted. From the extended observa- 

 tions of von Graff and Jensen it appears that this species is 

 divisible into macro- and raicro-pharyngeal varieties. Eyes 

 paired, reniform. The genital aperture is ventral, at the 

 base of the "tail." The testes lie far forward at the sides of 

 the pharynx, and lead iuto paired vasa deferentia. These unite 

 along with the " granule-secretion" in the base of the copu- 



1 I.e. barrel-shaped. The term is, however, used in a technical sense, in- 

 cluding certain structural peculiarities (see v. GraiF, ' Monographic,' pp. 83-4). 



