460 r. W. GAMBLE. 



(v. Graff) ; under stones between tide-marks, St. Andrews 

 (Mcintosh, 45) ; among decaying Ceramia, &c., Port Erin, Isle 

 of Man (F. W. G.). 



Distribution. — Egedesminde, West Greenland (Levinsen), 

 Faroe Islands (Schmidt), Bergen (Jensen). 



Sub-family Acrorhynchin^. 

 Proboscis at the anterior end provided with a 

 sheath opening in front, with muscular cone and 

 four long retractors. Pharynx rosulate. Yolk- 

 glands reticular (v. Graff [53], p. 318). 



Genus 12. — Acrorhynchus, v. Graff. 

 Acrorhyuchinse with a common genital pore. Two 

 germaria and elongate testes. Vesiculee semi- 

 nales and granulorum distinct, but enclosed in a 

 common muscular penial sheath. The copula- 

 tory organ transmits both secretions (v. Graff, 

 'Monogr.,' p. 319). 



21. Acrorhynchus caledonicus (Claparede). 



1861. Prostomt^m caledonicdm, Claparede (35). 

 Length 1 — 2 mm. Body bluntly pointed in front, gra- 

 dually widening behind, and rounded posteriorly. Colour, 

 proboscis white, the rest of the body greyish brown with light 

 areas, indicating the positions of the more bulky internal 

 organs. R h a b d i t e s very small, numerous, evenly distributed. 

 Proboscis well developed (for an account of its structure see 

 V. Graff, 'Monographic,' pp. 119—124). Two very long re- 

 tractor muscles extend from its base to the posterior end of 

 the body. Pharynx before the middle, with a marginal 

 " seam." According to von Graff, the base of the extended pro- 

 boscis is enclosed in a nervous commissure proceeding from 

 the brain. Eyes two, provided with a lens. The genital 

 pore is placed just behind the centre. Testes lie at the sides 



