TRILOBIDAE 91 



Pharynx " narrow, almost tubular, but expanding very slightly 

 half-way back." Oesophagus cylindrical, without bulb. 

 Caudal end of male with or without preanal or postanal 

 papillae or both. An accessory piece present, with two 

 posterior processes, each with a bifid end. Female genital 

 tubes paired, opposed, outstretched. 



Hab. Marine (in sand). 



Genotype : P. cephalata Cobb, 1894. 



Cobb, 1894, Proc. Linn. Soc. N.S.W., Sydney, viii, 399; 

 Southern, 1914, Proc. R. Irish Acad., xxxi, 33. 



Cobb based the genus on the description of a single male 

 specimen. Southern records what he believes to be the same 

 species, and adds a description of the female. 



h. Solenolaimus Cobb, 1894. 



Cuticle unstriated, but with bristles distributed throughout 

 the surface of the body. Head rounded, with minute lips and 

 two crowns of short bristles. Lateral organs circular ( ?). 

 Pharynx narrow, tubular. Oesophagus spindle-shaped 

 anteriorly, slender; posteriorly swollen and muscular. Male 

 unknown. Tail of female subcylindrical, with rounded tip. 

 Caudal glands absent. 



Hab. Marine (in sand). 

 Genotype : S. obtusus Cobb, 1894. 



Cobb, 1894, Proc. Linn. Soc. N.S.W., Sydney, viii, 419. 



i. Eleutherolaimus FiUpjev, 1922. 



Cuticle thin, finely striated, apparently without bristles. 

 Head not distinct, with six papillae and four bristles. Lateral 

 organs circular. According to the figure, there is a wide, 

 cylindrical buccal capsule which is prolonged anteriorly into 

 a crown of convergent chitinoid rodlets (giving the whole 

 structure much the appearance of the mouth of an Oeso- 

 phagostome). Oesophagus gradually swollen posteriorly, 

 without bulb. An accessory piece present, with two posterior 

 processes. 



Hab. Marine. 



Genotype : E. longus Filipjev, 1922. 



Filipjev, 1922, Act. Inst. Agronom. StauropoL, i (16), 173. 



The genus Eleutherolaimus is proposed by Filipjev for the 

 reception of his species longus (described from a single male 

 specimen), and of six other species which have been previously 

 referred to Monhystera and Terschellingia. The unusual 

 structure of the buccal capsule makes it imperative that the 

 genotype should be better known before the genus can be 

 accepted and the older species included in it. 



