184 On the Invertebrate Fauna of St. Andrews. 



Gonozooids belonging to a species of Hyhocodon were 

 obtained in considerable numbers in the bottom-nets in April 

 and May 1890. Their occurrence suggests the presence of a 

 second species of Corymorpha in the bay. 



SiPHONOPHORA. 



Two examples of a form allied to Agalmopsis, but appa- 

 rently undescribed, were taken in the bottom-net in May 1890 

 in company with Ilijhocodon. I have handed over the speci- 

 mens of both these forms, together with such notes and 

 drawings as I made of them, to the Rev. A. D. Sloan, M.A., 

 B.Sc, who is making a careful investigation of them *. 



Gastropoda. 



PleurophylUdia Loeveni, Bergh. 



Specimens of this rare British moUusk were obtained for 

 the first time from the haddock-lines from the mouth of the 

 bay in the autumn of 1889 and in April 1890. 



Idalia aspersa (A. & H.). 



On examining a large Molgula arenosa brought up by tlie 

 haddock-lines from the sandy part of the bay a specimen of 

 this rare mollusk was found to have effected a lodgment 

 inside the test^ which was somewhat torn. 



Tritonia Homhergii (Cuv.). 



A perfectly white specimen was brought in on the haddock- 

 lines in the spring of 1890. The mollusk is not rare in the 

 neighbourhood of the Bell Bock. 



Enteropneusta. 



A few Tornaria larvae were taken at the surface on the 

 6th and 7th August, 1890. They appeared to be identical 

 with those described by Bourne from Plymoutli, which are 

 the only others recorded from British waters. Balanoglossus 

 is not known to occur anywhere in the neighbourhood of 

 St. Andrews. 



EXPLANATION OF PLATE XI. 

 Fig. 1. Caligus rapax, with epizoic Hemiophnja Dalyelli, sp. n. 

 Fiys. 2-4. Animals and portions of the tubes of the last-named in various 



states of expansion ; more highly magnified. 

 Fiys. 6 & 7. Lateral and anterior views of Pilidium larva, ft, flagellum ; 



p.s.d., prostomial disk ; st., stomach. 



* Vide Ann. & Mag. Nat. Hist., May 1891. 



