64 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



shaped, and consists of a number of chitinous pieces, 

 separating the duct of the vesicula seminaHs from the 

 passages constituting the outlets for the granule-gland. 

 The sperm, conveyed down the main duct, issues through 

 the passages I t I, the granule-secretion on the other 

 hand by the duct marked I I, outside the retort. The 

 chitinous strips forming the neck, are bound together by 

 the piece marked D. The spermatheca, placed in front of 

 the genital pore, receives at its blind end the chitinized 

 ducts of an accessory-gland, while its distal portion bears 

 a series of five triangular chitinous teeth hinged at their 

 bases to its inner wall. 



This species occurred in tide-pools round Port Erin and 

 also commonly among weeds from "the Clets " a group 

 of rocks in the Calf Sound. It has been recorded from 

 Millport and Plymouth. 



Family — Proboscid^. 

 11. PseudorhyncJms hifidus, Mint. (PI. XIV, figs. 33, 34.) 

 Length 1 mm. Body produced in front into a conical 

 non-ciliated ''proboscis"; posteriorly it widens and ends 

 in a bifid hinder extremity. Colour whitish-yellow with 

 rounded brown spots over the surface. This form is 

 interesting as it shows the way in which the proboscis 

 characteristic of this Family has been elaborated. In 

 Fseudorliynchus the proboscis is simply the slightly modi- 

 fied anterior extremity, furnished with numerous short 

 retractor muscles. It is probable that by a specialization 

 of these together with the addition of a mass of muscles 

 known as the '• muscle-cone " and a pharyngeal sheath, 

 the typical proboscis has been formed as we see it in e.g. 

 AcrorhyncJins. 



The copulatory-organ is a long funnel -shaped chitinous 

 structure, round the outer face of which a spiral ridge 



