Anglo-Norman Islands. 357 



indicate outwardly the presence of the Balanoglossus in the 

 sand, and I have never remarked the pile of sand of which 

 Giard speaks, and which indicates the position of the Balano- 

 glossi at the Gl^nans. 



II. — In the Zosterce which extend to the north of the island 

 live some interesting forms, which, however, occur also at 

 Jersey and Guernsey. Some sponges [Leucosolenia hotryoides^ 

 Isodictya fucorum) and Compound Ascidia {Aplidium zosteri- 

 cola^ Leptoclmum maculosum, L. asperum, L. gelatinosum, and 

 L. sabtdosuniy Dtdemnum sargassicola^ BotrylloideSy and Bo- 

 tryllus) are common there ; small Crustsmea, {Hijjpolyte varianSj 

 Mysis vulgaris and M. chamadeon^ Gastrosaccus sanctus, 

 Cuma Audomnt, and numerous Amphipoda) swarm there. 

 Upon the Zosterce numerous Lucernarioi {L. octoradiata, Lam.) 

 are attached j I have only observed them at this single 

 station. 



III. — Under stones and under the rocks, towards the north 

 and north-west of the island, a very rich fauna lies hidden. 



Among the Ccelenteeata we may cite : — Sagartia sphy- 

 rodeta a,nd S. viduata,Mi\\\., Aiptasia Couchu and Corynactis 

 viridi's, Allm., represented by several varieties which clothe 

 the lower surface of the rocks^ in company with Alcyonium 

 digitatuviy Linn. 



Of the Sponges : — Sycon ciliatum and 8. tessellatum^ 

 Grantia compressa^ Dictyocylindrus ramosus, Hymeniacidon 

 caruncula and H. mammeata, Halichondria incrustans and 

 B. panicea, and Isodictya simulans. 



The EcHiNOUEEMATA are represented by Strongylocenfrotus 

 lividus (pretty common), Asterias glacialis (which occurs 

 under nearly every stone), Ophiotlirix fragilis^ Ophiocoma 

 neglecta^ and Comatula rosea (generally distributed species). 

 Crihrella ocidata and Asterias ruhens are sometimes found on 

 the sand. Echinocyamus pusillus, Flem., is rather common ; 

 it also occurs among the Zostera. Cucumaria pentactes is 

 pretty frequent. In one of the bulbous swellings at the base 

 of the Laminarice I once found a specimen of a Holothurian, 

 which has unfortunately been mislaid ; from the description 

 of it, which I have preserved, I think I am not mistaken in 

 referring it to Psolinus brevis, Forbes. 



The TuEBELLARiA are rather abundant : — Leptoplana 

 tremellaris and Prostheceroius vittatus are frequent ; Polycelis 

 lavigatus and Eurylepta cornuta are sometimes associated with 

 it, but are more rare. Of the Nemerteans I have met with 



Ann. & Mag. N. Hist. Ser. 5, Vol. xviii. 25 



