364 



logia Danica ' (1781). The anchors and plates are also figured 

 in the admirable Memoir of Duben and Koren*. The ana- 

 tomy of this species is described at some length by M. Quatre- 

 fages f, who regarded it as a new species, and called it S. Duvemcea. 

 These specimens were obtained on the coast of Britany, at the Isles 

 Chaussey near St. Malo, where they were very abundant in the mud 

 near low water, and attained a length of 10 to 18 inches, with a dia- 

 meter of 5 to 12 lines. 



The anchor-plates of this species (fig. 19) more nearly resemble 

 those of the Red Sea S. vittata than the last. They are oval, with 

 no arch or process at the articular end, and the disk is perforated 

 by six oval cells surrounding a central opening each with a scolloped 

 border, as in S. vittata. 



The anchors have serrated flukes, the serrations varying from 3 

 to 7 ; and the anchors are sometimes shorter than the plates, some- 

 times considerably longer (figs. 18, 21). 



The miliary granules are few, and confined to the muscular bands ; 

 they are only half as long as in S. digitata, and rudely crescent- 

 shaped (fig. 20). 



A. specimen of this Synapta was obtained by Mr. Henslow at 

 Aberystwith, and communicated in 1819 to Dr. Leach, who labelled 

 it " Jemania Henslow ana.'''' It is a small individual with imper- 

 fectly developed spicula, but showing the characteristic pinnate ten- 

 tacles. 



In June 1856 Mr. J. W. Wilton, of Gloucester, found another 

 example at Criccieth, on the same coast of Cardigan Bay. It was 

 discovered under a stone, at low water, and presented the appear- 

 ance of " a clear pinkish waving worm, about 3 inches long, with a 

 number of little papillae all over it, and five faint longitudinal bands 

 from head to tail. It had twelve tentacles, with five digits on each 

 side. It was perpetually waving and swelling in one part, contract- 

 ing in another J. It lived but a short time, and finally constricted 

 itself and broke up into half a dozen fragments." 



In February 1856 Mr. E. C. Buckland obtained a finer specimen 

 under similar circumstances, in Lihou Bay, Guernsey. A micro- 

 scopic preparation of the skin of this specimen shows 1 50 anchors 

 in the field of the inch object-glass (4/ inch diameter) ; and the an- 

 chors are more than half as long again as the plates §. 



Mr. Cocks, who met with Synapta inhcerens on the coast of Corn- 

 wall, regarded it as a variety of S. digitata. He describes it as 

 having "13 digitated pinnae on each tentaculum. Length of speci- 

 mens procured from 1 to 2\ inches by T Vth to \\h of an inch. Found 

 in hard and stony soil ; Helford, scarce ; Falmouth, very rare. I 

 have kept them alive for months in sea-water procured from Helford 



* Proceedings of the Royal Academy of Sciences, Stockholm, 1846. 



t Annales des Sciences Nat. 2 ser. 1. 17. Zool. p. 19. 



X Forskal named one species Synapta reciprocans, on account of these remark- 

 able muscular movements. 



§ " Slides " of this specimen are in many cabinets, with a red label, but with 

 no specific name or locality. 



