Annelida of St. Andreios. 



151 



Fam. 2. Schizostomea, O. Sclim. 

 Genus CONVOLUTA, CErst. 

 Convoluta jyarcidoxa, Abildgaard ; Jolmst. Cat. p. 16. 

 Very common amongst seaweeds and Corallina in tide- 

 pools. 



Convoluta Diesingii^ Schmidt (?), Sitzungsb. der k. Akad. 1852. 

 Occasionally under stones in rock-pools. 



Fam. 3. Mesostomea, O. Schm. 

 Genus Mesostomum (Dug^s),M. Scli. 

 Mesostoraum hijidum, n. sp. 

 On the under surface of stones from low-water mark, East 

 Kocks. One tenth of an inch long, and of a very pretty pale 

 orange hue. The body is pointed anteriorly, dilates in the 

 middle, and diminishes posteriorly, terminating in two pro- 

 cesses which have a few rather large papilla? on their crenated 

 edge ; these papillge seem to have a slight sucker-action. 

 There are two semilunar eyes, with the concavity external. 

 The cilia are specially distinct a little behind the snout, on^ 

 each side, at points corresponding to the long ciliary whips ol 

 the developing Nemertean. The male organ formed a spirally 

 marked conical process behind the large median sucker ; and 

 the testes were loaded with spermatozoa in various stages of 

 development. 



Fam. 4. Derostomea, (Erst. 



Genus VoiiTEX, Ehrenberg. 



Vortex cajjitata^ (Erst. Entwurf Plattwiirmer, p. 65, 

 pi. 1. f. 7. 

 Occasionally under stones between tide-marks. Many dia- 

 toms occur in the digestive canal. 



Fam. 5. Opistomea, O. Schm. 

 Genus MoNOCELis, Ehrb. 

 Monocelis unipunctata (Fab.), (Erst. Ent. Plattw. p. 56. 

 This appears to be the Planaria fustree of Dalyell. It is 

 abundant under stones between tide-marks. 



