358 Dr. R. Koeliler on the Littoral Fauna of the 



Lineus Jongissimus, Nemertes gracilis^ Tetrastemma candidum^ 

 and some Valenciw, as at Guernsey. 



The PoLYCH^TA are represented by nearly all the Guernsey 

 species. I may particularly mention a very large species of 

 Lvmhriconereis, over a quarter of an inch broad, of which, 

 unfortunately, I did not obtain the anterior extremity, and 

 which Iapproximatetothei.^?'<7a?«^<:'adescribed by Quatrefages ; 

 and Polyyioe areolata, Gr., which I did not observe at Guern- 

 sey. As to the other species that I have brought from Herm, 

 they are chiefly : — Poh/noe cirrata, Sthenelais Edwardsiiy 

 Eunice Har7'assii J Marphysa sanguinea, Staurocephalus rubro- 

 vittatusj Lysidice ninetta^ Lumhriconereis contorta, Aonia 

 foliacea, Ctrratidus Laniarckii^ Siphonostomum uncinatum^ 

 Nereis Dumerilii, Syllis arnica, Eulalia clavigera, Phyllodoce 

 laminosa, Eteone longa, Glycera capitata, &c. 



The most interesting Crustacean of this region \s Alpheus 

 ruber J Edw., a species which is known to be essentially 

 Mediterranean. Bell describes it in his work from a specimen 

 found in the stomach of a codfish at Falmouth. The Alpheus 

 is not very abundant at Herm ; I have, however, collected 

 several specimens. Moreover it indicates its presence by the 

 dry sound which it produces by the creaking of the movable 

 joint of its raptorial feet. With Alpheus ridmr I have found 

 Stenorhynchus phalangium, Inachus dorynchus, Pisa Gibhsii 

 and P. tetraodoHy Xantho florida, Pilumnus hirtellus, Pirimela 

 denticulata, Poriunus iiuher, and Athanas nitescens. 



Among the Mollusca I must indicate two Cephalopods — 

 Ommastrephes sagittatus^ Lam., and Eledone cirrhosa. Lam. ; 

 and two other species which appear also to be peculiar to the 

 island of Herm — Galeomma Turtonis, Turt., and Lima Mans, 

 Gmel. 



Unfortunately I could devote only a few hours to my 

 researches in the north of the island of Herm. In the first 

 place I could not go to that island so often as I wished, 

 and further I chiefly explored the shell-sands for the 

 purpose of procuring Balanoglossi, of which I wished to 

 possess some specimens which might enable me, after my 

 return to France, to make an anatomical investigation of this 

 interesting type. But the few indications, incomplete as they 

 evidently are, that I am able to give here with regard to the 

 fauna of the island of Herm suffice to show that this locality 

 is one of truly exceptional richness, and that to zoologists 

 fortunate enough to be able to explore it thoroughly it will 

 furnish exceedingly interesting prizes. 



The geological constitution of the island of Herm difl:ers 



