98 REPORT— 1864. 



through the centre of their perpendicular burrows, disclosing the animal in the 

 canal, which appeared destitute of all lining material. The identity of the animal 

 was readily foimd from its quickly adhering to the fingers by its anchor-shaped 

 booklets. Its appearance when placed in sea-water was at once indicative. It 

 was a delicate rosy-pink colour, and having five white bands arranged lengthwise 

 throughout the body from the oral to the anal apertm-es. The mouth was sur- 

 roimded by a ring of twelve tentacles, which were pinnated, and appeared to have 

 six pinna3 on each side, with one terminal digit, thirteen pinnse in all. Some of 

 these animals were distended with sand, and appeared darker in colour, but the 

 anal extremity was generally enlarged, more transparent, and of the usual pink 

 colour, from being inflated with sea-water. That distention was the means of 

 retaining the animal in its buiTOw, by giving it a fixed fidcrum for the contraction 

 of the longitudinal muscles. The sand bank was dark in colour, and foetid, fi-om 

 the large quantity of decaying animal matter therein. The Sijnapta doubtless fed 

 upon that refuse material by gorging itself with sand fi-om time to time. The 

 author said that the position of St/napfa in the zoological scale, keeping stiictly to 

 the method of arrangement adopted by Professor Forbes, should be removed from 

 the Holothuriadfe and placed in the Vermigrade oi-der, as no pedal rows of ambu- 

 lacral cirrhi existed, and there were no appearances of any protrusile branchial 

 organs. The author concluded that the Guernsey St/napfa was a new species, being 

 distinguished by the preceding zoological characters, and by the peculiarities of the 

 anchors and the anchor-plates, which have the follomng characters : — 



Anchor-plates ovate, shaped with a process or arch, each plate being concavo- 

 convex like a spoon, having serrated external margins when perfect, and one 

 central round apertiu'e with seven oval openings surrounding it, and two or three 

 oval apertm'es at the junction of the arch ; the lesser end of plate minutely 

 perforated. 



Anchors serrated, occasionally plain ; three to seven serrations, with the flukes 

 reflexed; anchors longer than bucklers, to which they are articulated at the lesser 

 end of the plate, and upon its concave aspect. The anchors are generally elevated 

 at an acute angle with the buckler, and in adult specimens are arranged in five 

 longitudinal rows between the muscular bands. They are more numeroiis at the 

 anterior extremity of the Synapta, and comparatively deficient at the small bulg- 

 ing portion. There appears to be a thin epidermis over both anchors and plates 

 A^ery commonly, and these appendages are produced in layers as in any other 

 epidermis, the outer layers wearing away and new ones taking their places; 

 occasionally miniatm-e and imperfect anchors are to be found -with incipient 

 plates only. 



The author proposed for this animal the name of Synapta GalUennii vel Sarniensis, 

 and concluded his paper by expressing his ack-nowledgments to both M. J. P. 

 GaUienne and to Professor Wa-viIIc Thompson for the kind assistance which they 

 had rendered him in his investigations. 



[This paper will be found in extenso in the Microscopical Quarterly Journal, 

 new series, No. 17, January 1865.] 



On the Application of PJwtof/raphy and the Magic Lantern to Class Demon- 

 strations in Microscopic Science and Natural History. By Samxtel 



HlGHLET, F.G.S., F.C.S., SfC. 



The author called attention to an extensive series of photographic transpai-encies 

 illustrating nearly everj' department of science, but especially zoology and micro- 

 scopy, which had been prepared for demonstrating by aid of an achromatic magic 

 lantern. Truthfulness to nature, even to the most minute details, — the impressive 

 character of the image projected, being often stereoscopic in aspect, — the lecturer 

 being able to fix the attention of the student upon otie object at a time, — poi-t- 

 ability and cheapness — being claimed as advantages over ordinary diagrams. 



On some New Hydroid Zoophytes, and on the Olassijlcation and Terminology 

 of the Hydroida. By the Eev. Thomas Hincks. 



