Anglo-Norman Islands, 355 



Pall., Sabella pavonina^ Sav., and 8. arenilega^ Quatref., are 

 very common. But the Ghcetopteri (C. Valenci'mi, Quatref.) 

 especially are abundant on all parts of the shore ; they are 

 found almost at every step, and even at points very close to 

 the bank which are laid bare at nearly every tide. 



As to the Decapoda, they are represented by five 

 species: — T/iia poltta, Gorystes cassivelaunuSj Gallianassa 

 suhterraneaj Oebia deltura^ and Axius stirhynchus. These 

 species, as is well known, are all fossorial. 



MoLLUSCA are also very abundant, and belong- to the fol- 

 lowing species : — hutraria ohlonga^ Chemn. ; Solecurtiis can- 

 diduSj Ren. ; Tellina squalida^ Pult. ; Solen ensis and S. vagina^ 

 Linn. ; Pectunculus glycymeris, Linn. ; Psammohia ferroensiSj 

 Chemn. ; Mya truncata, Linn. ; Gardium norvegtcum, Sp. ; 

 Astarte triangularis^ Mont. ; Donax politus, Poll ; Mactra 

 glauca^ Born; Natica Alderi, Forbes; and Skenea plariorbis, 

 Forbes. 



Amphioxus lanceolatus is exceedingly common in the shell- 

 sands at the limit of the lowest tides. The specimens are 

 always of rather large size, attaining a length of over 2^ 

 inches. 



Lastly, I have found in these shell-sands several specimens 

 of a fine Balanoglossus, of which I have already given a 

 description in a note addressed to the Academy of Sciences. 



The Balanoglossus of the island of Herm is very long and 

 of very considerable size. As it is exceedingly soft and its 

 body is always elongated, except towards the posterior extre- 

 mity, which remains rolled up, I have never succeeded in 

 obtaining a single entire specimen. The drawing which I 

 give (PI. XL fig. 1) was made from three separate pieces of 

 the same individual. As it is represented of the natural size, 

 it will be seen that its length was about 14 inches. But I 

 am convinced that some individuals may attain a much greater 

 length, for I have collected pieces of the digestive tube, filled 

 with sandj corresponding to the segment situated beyond the 

 hepatic appendages, which were nearly 16 inches long. The 

 diameter is about xV inch at the level of the collar. 



The conical trunk, j^ inch in length when extended, is of 

 a bright yellow colour. The succeeding or branchio-genital 

 portion of the body, which extends to the hepatic region, is of 

 a deep orange-colour, which passes into dark green at the 

 level of the hepatic diverticula. The green colour is con- 

 tinued beyond the point at which the diverticula disappear ; 

 then it is gradually lost, and the last portion of the body, of 

 from 4 to 8 inches in length, is quite colourless. 



The collar is j% inch in length. Its anterior margin 



