HERAPATH, ON THE GENUS SYNAPTA. 5 
Anchor plates pointed ovate, with no process or arch at 
the articular end; apertures in plates consist of 6 oval 
fenestra, surrounding a central opening with a scalloped 
border, as in S. vittata. ‘The anchors have serrated flukes, 
the serrations 3—7, anchors sometimes shorter than plates, 
sometimes much longer. 
S. Galliennii, vel Saruiensis.—Having 12 tentacles with 6 
pimnze on each side and | terminal digit, therefore 13 in all. 
Anchors serrated, occasionally plain ; 3—7 serrations, with 
the flukes reflexed. 
Anchor plates ovate, shaped with a process or arch; each 
plate being concavo-convex, like a spoon, having serrated 
external margins when perfect, and 1 central round 
aperture with 7 surrounding it, and 2 or 38 oval apertures at 
the junction of the arch; the lesser end of oval minutely 
perforated. 
Anchors longer than bucklers, to which they are articulated. 
The S. Galhennii, of Guernsey, has anchor plates which 
articulate with the anchors by the lesser end of the plate and 
upon the concave surface of the plate. The anchors are 
generally elevated at an acute angle with the buckler, and in 
adult specimens are arranged in 5 longitudinal rows between 
the muscular bands. ‘They are more numerous at the 
anterior extremity of the Synapta, and comparatively deficient 
at the small bulging portion. There appears to be a thin 
epidermis over both anchors and plates very frequently ; 
these appendages are produced by layers as in any other 
epidermis, the outer layer wearing away and new ones taking 
their places; occasionally miniature and imperfect anchors 
are to be found with incipient plates only. 
There are two Synapte frequently in the hands of the 
dealers in microscopical slides, and these are S. vittata, from 
the shores of the Red Sea, and it is the species from which 
most microscopists have obtained their specimens and with 
which all are probably familiar ; they are obtained near Suez, 
and the slides are made up in Paris, but re-manufactured in 
this country. The anchor flukes are plain and simple, and the 
articular end of the shank deeply subdivided; the plates are 
furnished with a raised arch at the smaller end, forming a 
sort of cavity for the reception of the anchor stock. They are 
exactly, like those figured in Miiller’s article, “‘ Uber der 
Bau der Echinoderm” (‘ Berlin Transactions,’ 1854), band 6, 
fig. 17, under the name of S. serpentina. There is a wood- 
cut of them in Dr. Carpenter’s work on the microscope, and 
figures are also given in the ‘ Micrographic Dictionary,’ 
which very summarily dismisses the subject. 
